Universal Motor wiring advice request. | Electronics Forum (Circuits, Projects and Microcontrollers)

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It may not display this or other websites correctly.<br />You should upgrade or use an <a href="https://www.google.com/chrome/" target="_blank" rel="noopener">alternative browser</a>.</div> <div class="p-body-header"> <div class="p-title "> <h1 class="p-title-value">Universal Motor wiring advice request.</h1> </div> <div class="p-description"> <ul class="listInline listInline--bullet"> <li> <i class="fa--xf fal fa-user" aria-hidden="true" title="Thread starter"></i> <span class="u-srOnly">Thread starter</span> <a href="/members/rfdes.327626/" class="username u-concealed" dir="auto" data-user-id="327626" data-xf-init="member-tooltip">rfdes</a> </li> <li> <i class="fa--xf fal fa-clock" aria-hidden="true" title="Start date"></i> <span class="u-srOnly">Start date</span> <a href="/threads/universal-motor-wiring-advice-request.166751/" class="u-concealed"><time class="u-dt" dir="auto" datetime="2024-10-18T09:01:50-0700" data-time="1729267310" data-date-string="Oct 18, 2024" data-time-string="9:01 AM" title="Oct 18, 2024 at 9:01 AM">Oct 18, 2024</time></a> </li> </ul> </div> </div> <div class="p-body-main p-body-main--withSidebar "> <div class="p-body-contentCol"></div> <div class="p-body-sidebarCol"></div> <div class="p-body-content"> <div class="p-body-pageContent"> <div class="block block--messages " data-xf-init="lightbox select-to-quote" data-message-selector=".js-post" data-lb-id="thread-166751"> <div class="block-outer"></div> <div class="block-outer js-threadStatusField"></div> <div class="block-container"> <div class="block-body"> <article class="message message--post js-post js-inlineModContainer " data-author="rfdes" data-content="post-1456452" id="js-post-1456452" > <span class="u-anchorTarget" id="post-1456452"></span> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" > <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/rfdes.327626/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="327626" data-xf-init="member-tooltip" style="background-color: #7a5cd6; color: #eeebfa"> <span class="avatar-u327626-m" role="img" aria-label="rfdes">R</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/rfdes.327626/" class="username " dir="auto" data-user-id="327626" data-xf-init="member-tooltip">rfdes</a></h4> <h5 class="userTitle message-userTitle" dir="auto">New Member</h5> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/universal-motor-wiring-advice-request.166751/post-1456452" rel="nofollow" > <time class="u-dt" dir="auto" datetime="2024-10-18T09:01:50-0700" data-time="1729267310" data-date-string="Oct 18, 2024" data-time-string="9:01 AM" title="Oct 18, 2024 at 9:01 AM">Oct 18, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/universal-motor-wiring-advice-request.166751/post-1456452" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1456452/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/universal-motor-wiring-advice-request.166751/post-1456452" rel="nofollow"> #1 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1456452" data-lb-caption-desc="rfdes · Oct 18, 2024 at 9:01 AM"> <article class="message-body js-selectToQuote"> <div > <div class="bbWrapper">Hi -<br /> I found a Craftsman model CMXETAX69434502 table saw in a dumpster recently. By it's condition it appeared unused. However, the unit's electromagnetic switch had been removed and I assumed that the saw failed shortly after it's first use. With the switch missing, I am trying to understand how this unit was wired. The motor is a universal motor and I was successful (or so I think) in figuring out the wiring(see pictorial). Applying AC to the Blue/Grey wires gives me the proper rotation and the motor runs fine. Applying AC to the Black wires rotates the rotor in the opposite direction. The question what is the alternate wiring (Black wires) used for? My guess is a brake system. After some research, this is the model magnetic switch that was used in this saw. <br /> <br /> I could use some guidance as to how this motor was wired with this magnetic switch, particularly with the black wires.<br /> <br /> Thanks for any help you can offer.<br /> Jim</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> <section class="message-attachments"> <h4 class="block-textHeader">Attachments</h4> <ul class="attachmentList"> <li class="file file--linked"> <a class="u-anchorTarget" id="attachment-147474"></a> <script class="js-extraPhrases" type="application/json"> { "lightbox_close": "Close", "lightbox_next": "Next", "lightbox_previous": "Previous", "lightbox_error": "The requested content cannot be loaded. 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color: #e0c2f0"> <span class="avatar-u73824-m" role="img" aria-label="Diver300">D</span> </a> <span class="message-avatar-online" tabindex="0" data-xf-init="tooltip" data-trigger="auto" title="Online now"></span> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/diver300.73824/" class="username " dir="auto" data-user-id="73824" data-xf-init="member-tooltip"><span itemprop="name">Diver300</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Well-Known Member</h5> <div class="userBanner userBanner userBanner--gray message-userBanner" itemprop="jobTitle"><span class="userBanner-before"></span><strong>Most Helpful Member</strong><span class="userBanner-after"></span></div> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/universal-motor-wiring-advice-request.166751/post-1456459" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-10-18T14:05:07-0700" data-time="1729285507" data-date-string="Oct 18, 2024" data-time-string="2:05 PM" title="Oct 18, 2024 at 2:05 PM" itemprop="datePublished">Oct 18, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/universal-motor-wiring-advice-request.166751/post-1456459" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1456459/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/universal-motor-wiring-advice-request.166751/post-1456459" rel="nofollow"> #2 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1456459" data-lb-caption-desc="Diver300 · Oct 18, 2024 at 2:05 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">I think that you should connect power to 3 and 7 of the switch, and connect blue and grey to 4 and 8. That will run the motor when the switch is turned on.<br /> <br /> You should also connect the black wires to 1 and 2. That will brake the motor when turned off.<br /> <br /> (Usual disclaimers, these are best guesses only. If it goes wrong, all you get is my apologies. Keep your fingers away from live wires and saw blades.)</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> <aside class="message-signature"> <div class="bbWrapper"><a href="http://twitter.com/mtrak_uk" target="_blank" class="link link--external" rel="nofollow ugc noopener">http://twitter.com/mtrak_uk</a></div> </aside> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="reactionsBar js-reactionsList is-active"> <ul class="reactionSummary"> <li><span class="reaction reaction--small reaction--1" data-reaction-id="1"><i aria-hidden="true"></i><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="reaction-sprite js-reaction" alt="Like" title="Like" /></span></li> </ul> <span class="u-srOnly">Reactions:</span> <a class="reactionsBar-link" href="/posts/1456459/reactions" data-xf-click="overlay" data-cache="false" rel="nofollow"><bdi>rjenkinsgb</bdi></a> </div> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> <div class="message-cell message-cell--vote"> <div class="message-column"> <div class="contentVote js-contentVote " data-xf-init="content-vote" data-content-id="post-1456459"> <meta itemprop="upvoteCount" content="0" /> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--up " data-vote="up"><span class="u-srOnly">Upvote</span></a> <span class="contentVote-score js-voteCount" data-score="0">0</span> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--down " data-vote="down"><span class="u-srOnly">Downvote</span></a> </div> </div> </div> </div> </article> <article class="message message--post js-post js-inlineModContainer " data-author="rfdes" data-content="post-1456464" id="js-post-1456464" itemscope itemtype="https://schema.org/Answer" itemid="https://www.electro-tech-online.com/posts/1456464/"> <meta itemprop="parentItem" itemscope itemid="https://www.electro-tech-online.com/threads/universal-motor-wiring-advice-request.166751/" /> <span class="u-anchorTarget" id="post-1456464"></span> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" itemprop="author" itemscope itemtype="https://schema.org/Person" itemid="https://www.electro-tech-online.com/members/rfdes.327626/"> <meta itemprop="url" content="https://www.electro-tech-online.com/members/rfdes.327626/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/rfdes.327626/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="327626" data-xf-init="member-tooltip" style="background-color: #7a5cd6; color: #eeebfa"> <span class="avatar-u327626-m" role="img" aria-label="rfdes">R</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/rfdes.327626/" class="username " dir="auto" data-user-id="327626" data-xf-init="member-tooltip"><span itemprop="name">rfdes</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">New Member</h5> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/universal-motor-wiring-advice-request.166751/post-1456464" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-10-18T16:28:32-0700" data-time="1729294112" data-date-string="Oct 18, 2024" data-time-string="4:28 PM" title="Oct 18, 2024 at 4:28 PM" itemprop="datePublished">Oct 18, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/universal-motor-wiring-advice-request.166751/post-1456464" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1456464/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/universal-motor-wiring-advice-request.166751/post-1456464" rel="nofollow"> #3 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1456464" data-lb-caption-desc="rfdes · Oct 18, 2024 at 4:28 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">Thank you for the response. I don't understand how shorting the black wires when off causes the motor to brake'</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="reactionsBar js-reactionsList "> </div> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> <div class="message-cell message-cell--vote"> <div class="message-column"> <div class="contentVote js-contentVote " data-xf-init="content-vote" data-content-id="post-1456464"> <meta itemprop="upvoteCount" content="0" /> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--up " data-vote="up"><span class="u-srOnly">Upvote</span></a> <span class="contentVote-score js-voteCount" data-score="0">0</span> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--down " data-vote="down"><span class="u-srOnly">Downvote</span></a> </div> </div> </div> </div> </article> <article class="message message--post js-post js-inlineModContainer " data-author="Diver300" data-content="post-1456480" id="js-post-1456480" itemscope itemtype="https://schema.org/Answer" itemid="https://www.electro-tech-online.com/posts/1456480/"> <meta itemprop="parentItem" itemscope itemid="https://www.electro-tech-online.com/threads/universal-motor-wiring-advice-request.166751/" /> <span class="u-anchorTarget" id="post-1456480"></span> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" itemprop="author" itemscope itemtype="https://schema.org/Person" itemid="https://www.electro-tech-online.com/members/diver300.73824/"> <meta itemprop="url" content="https://www.electro-tech-online.com/members/diver300.73824/" /> <div class="message-avatar message-avatar--online"> <div class="message-avatar-wrapper"> <a href="/members/diver300.73824/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="73824" data-xf-init="member-tooltip" style="background-color: #9933cc; color: #e0c2f0"> <span class="avatar-u73824-m" role="img" aria-label="Diver300">D</span> </a> <span class="message-avatar-online" tabindex="0" data-xf-init="tooltip" data-trigger="auto" title="Online now"></span> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/diver300.73824/" class="username " dir="auto" data-user-id="73824" data-xf-init="member-tooltip"><span itemprop="name">Diver300</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Well-Known Member</h5> <div class="userBanner userBanner userBanner--gray message-userBanner" itemprop="jobTitle"><span class="userBanner-before"></span><strong>Most Helpful Member</strong><span class="userBanner-after"></span></div> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/universal-motor-wiring-advice-request.166751/post-1456480" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-10-19T04:45:59-0700" data-time="1729338359" data-date-string="Oct 19, 2024" data-time-string="4:45 AM" title="Oct 19, 2024 at 4:45 AM" itemprop="datePublished">Oct 19, 2024</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/universal-motor-wiring-advice-request.166751/post-1456480" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1456480/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/universal-motor-wiring-advice-request.166751/post-1456480" rel="nofollow"> #4 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1456480" data-lb-caption-desc="Diver300 · Oct 19, 2024 at 4:45 AM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper"><blockquote data-attributes="member: 327626" data-quote="rfdes" data-source="post: 1456464" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/goto/post?id=1456464" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-1456464">rfdes said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Thank you for the response. I don't understand how shorting the black wires when off causes the motor to brake' </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote>It's a technique used all the time with DC motors. Car wipers and windows usually short the motors out when turned off to make them stop quickly.<br /> <br /> Motors are also generators. When they spin, they generate a voltage. Shorting that voltage causes current to flow that opposes the motion. You mentioned that putting power on the black wires makes the motor go backwards. Therefore current flowing in the 2.5 Ohm winding and the armature is producing torque that is in reverse. Allowing that current to flow when the motor is turned off will produce torque in reverse, which is braking torque. That obviously stops when the motor stops.<br /> <br /> You can try it out. Short the black windings and spin the motor. It will most likely be possible to feel the difference in how fast the motor slows down. It might not, because there might be no residual magnetic field, so no voltage generated, so no torque. When braking from running, there will be the field present from when the motor was running.<br /> <br /> Be aware that there might be a big voltage on the windings when spinning the motor by hand, and the saw blade will be just as sharp without electric power.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> <div class="message-lastEdit"> Last edited: <time class="u-dt" dir="auto" datetime="2024-10-20T00:21:41-0700" data-time="1729408901" data-date-string="Oct 20, 2024" data-time-string="12:21 AM" title="Oct 20, 2024 at 12:21 AM" itemprop="dateModified">Oct 20, 2024</time> </div> <aside class="message-signature"> <div class="bbWrapper"><a href="http://twitter.com/mtrak_uk" target="_blank" class="link link--external" rel="nofollow ugc noopener">http://twitter.com/mtrak_uk</a></div> </aside> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="reactionsBar js-reactionsList is-active"> <ul class="reactionSummary"> <li><span class="reaction reaction--small reaction--1" data-reaction-id="1"><i aria-hidden="true"></i><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="reaction-sprite js-reaction" alt="Like" title="Like" /></span></li> </ul> <span class="u-srOnly">Reactions:</span> <a class="reactionsBar-link" href="/posts/1456480/reactions" data-xf-click="overlay" data-cache="false" rel="nofollow"><bdi>rjenkinsgb</bdi></a> </div> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> <div class="message-cell message-cell--vote"> <div class="message-column"> <div class="contentVote js-contentVote " data-xf-init="content-vote" data-content-id="post-1456480"> <meta itemprop="upvoteCount" content="0" /> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--up " data-vote="up"><span class="u-srOnly">Upvote</span></a> <span class="contentVote-score js-voteCount" data-score="0">0</span> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--down " data-vote="down"><span class="u-srOnly">Downvote</span></a> </div> </div> </div> </div> </article> <article class="message message--post js-post js-inlineModContainer " data-author="rfdes" data-content="post-1456481" id="js-post-1456481" itemscope itemtype="https://schema.org/Answer" itemid="https://www.electro-tech-online.com/posts/1456481/"> <meta itemprop="parentItem" itemscope itemid="https://www.electro-tech-online.com/threads/universal-motor-wiring-advice-request.166751/" /> <span class="u-anchorTarget" id="post-1456481"></span> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" itemprop="author" itemscope itemtype="https://schema.org/Person" itemid="https://www.electro-tech-online.com/members/rfdes.327626/"> <meta itemprop="url" content="https://www.electro-tech-online.com/members/rfdes.327626/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/rfdes.327626/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="327626" data-xf-init="member-tooltip" style="background-color: #7a5cd6; 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Are you sure you want to submit this form?", attach: "Attach files", rich_text_box: "Rich text box", close: "Close", link_copied_to_clipboard: "Link copied to clipboard.", text_copied_to_clipboard: "Text copied to clipboard.", loading: "Loading…", you_have_exceeded_maximum_number_of_selectable_items: "You have exceeded the maximum number of selectable items.", processing: "Processing", 'processing...': "Processing…", showing_x_of_y_items: "Showing {count} of {total} items", showing_all_items: "Showing all items", no_items_to_display: "No items to display", number_button_up: "Increase", number_button_down: "Decrease", push_enable_notification_title: "Push notifications enabled successfully at Electronics Forum (Circuits, Projects and Microcontrollers)", push_enable_notification_body: "Thank you for enabling push notifications!", pull_down_to_refresh: "Pull down to refresh", release_to_refresh: "Release to refresh", refreshing: "Refreshing…" , "svStandardLib_time.day": "{count} day", "svStandardLib_time.days": "{count} days", "svStandardLib_time.hour": "{count} hour", "svStandardLib_time.hours": "{count} hours", "svStandardLib_time.minute": "{count} minutes", "svStandardLib_time.minutes": "{count} minutes", "svStandardLib_time.month": "{count} month", "svStandardLib_time.months": "{count} months", "svStandardLib_time.second": "{count} second", "svStandardLib_time.seconds": "{count} seconds", "svStandardLib_time.week": "time.week", "svStandardLib_time.weeks": "{count} weeks", "svStandardLib_time.year": "{count} year", "svStandardLib_time.years": "{count} years" }); </script> <form style="display:none" hidden="hidden"> <input type="text" name="_xfClientLoadTime" value="" id="_xfClientLoadTime" title="_xfClientLoadTime" tabindex="-1" /> </form>    <div id='div-gpt-eto_wallpaper'> <script> googletag.cmd.push(function() { googletag.display('div-gpt-eto_wallpaper'); }); </script> </div>  <script type="application/ld+json"> { "@context": "https://schema.org", "@type": "QAPage", "url": "https://www.electro-tech-online.com/threads/universal-motor-wiring-advice-request.166751/", "mainEntity": { "@type": "Question", "@id": "https://www.electro-tech-online.com/threads/universal-motor-wiring-advice-request.166751/", "name": "Universal Motor wiring advice request.", "datePublished": "2024-10-18T16:01:50+00:00", "url": "https://www.electro-tech-online.com/threads/universal-motor-wiring-advice-request.166751/", "image": "https://www.electro-tech-online.com/attachments/motorwire-jpg.147474/", "text": "Hi -\nI found a Craftsman model CMXETAX69434502 table saw in a dumpster recently. By it's condition it appeared unused. However, the unit's electromagnetic switch had been removed and I assumed that the saw failed shortly after it's first use. With the switch missing, I am trying to understand how this unit was wired. The motor is a universal motor and I was successful (or so I think) in figuring out the wiring(see pictorial). Applying AC to the Blue/Grey wires gives me the proper rotation and the motor runs fine. Applying AC to the Black wires rotates the rotor in the opposite direction. The question what is the alternate wiring (Black wires) used for? My guess is a brake system. After some research, this is the model magnetic switch that was used in this saw. \n\n I could use some guidance as to how this motor was wired with this magnetic switch, particularly with the black wires.\n\nThanks for any help you can offer.\nJim", "answerCount": 4, "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.electro-tech-online.com/members/rfdes.327626/", "name": "rfdes", "url": "https://www.electro-tech-online.com/members/rfdes.327626/" }, "suggestedAnswer": [ { "@type": "Answer", "datePublished": "2024-10-19T12:39:37+00:00", "url": "https://www.electro-tech-online.com/posts/1456481/", "text": "Thank you - that makes sense.\nTake care.", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.electro-tech-online.com/members/rfdes.327626/", "name": "rfdes", "url": "https://www.electro-tech-online.com/members/rfdes.327626/" } }, { "@type": "Answer", "datePublished": "2024-10-19T11:45:59+00:00", "dateModified": "2024-10-20T07:21:41+00:00", "url": "https://www.electro-tech-online.com/posts/1456480/", "text": "Thank you for the response. I don't understand how shorting the black wires when off causes the motor to brake'\n\nIt's a technique used all the time with DC motors. Car wipers and windows usually short the motors out when turned off to make them stop quickly.\n\nMotors are also generators. When they spin, they generate a voltage. Shorting that voltage causes current to flow that opposes the motion. You mentioned that putting power on the black wires makes the motor go backwards. Therefore current flowing in the 2.5 Ohm winding and the armature is producing torque that is in reverse. Allowing that current to flow when the motor is turned off will produce torque in reverse, which is braking torque. That obviously stops when the motor stops.\n\nYou can try it out. Short the black windings and spin the motor. It will most likely be possible to feel the difference in how fast the motor slows down. It might not, because there might be no residual magnetic field, so no voltage generated, so no torque. When braking from running, there will be the field present from when the motor was running.\n\nBe aware that there might be a big voltage on the windings when spinning the motor by hand, and the saw blade will be just as sharp without electric power.", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.electro-tech-online.com/members/diver300.73824/", "name": "Diver300", "url": "https://www.electro-tech-online.com/members/diver300.73824/" } }, { "@type": "Answer", "datePublished": "2024-10-18T23:28:32+00:00", "url": "https://www.electro-tech-online.com/posts/1456464/", "text": "Thank you for the response. I don't understand how shorting the black wires when off causes the motor to brake'", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.electro-tech-online.com/members/rfdes.327626/", "name": "rfdes", "url": "https://www.electro-tech-online.com/members/rfdes.327626/" } } ] }, "publisher": { "@type": "Organization", "name": "Electronics Forum (Circuits, Projects and Microcontrollers)", "description": "An electronics forum to talk all about circuits and projects.", "url": "https://www.electro-tech-online.com" } } </script>  <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-MMC9PJ9" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>   <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-KLX5R59" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>  <script> $(function(){ var notice = $('.xb-welcome-notice'); if(notice.length){ var cookie = XF.Cookie.get('hide_welcome_notice'); if(!cookie){ XF.Cookie.set('hide_welcome_notice', Date.now()); notice.show(); } else if ((Date.now() - cookie) > 8.64e+7){ XF.Cookie.set('hide_welcome_notice', Date.now()); notice.show(); } else { notice.hide(); } } }); </script> </div> </body> </html>

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Universal Motor wiring advice request. | Electronics Forum (Circuits, Projects and Microcontrollers)