{"id":4425,"date":"2021-08-25T18:09:04","date_gmt":"2021-08-25T18:09:04","guid":{"rendered":"https:\/\/www.teamtekin.com\/news\/?p=4425"},"modified":"2021-08-26T17:36:54","modified_gmt":"2021-08-26T17:36:54","slug":"gen4-rotor-shimming","status":"publish","type":"post","link":"https:\/\/www.teamtekin.com\/news\/gen4-rotor-shimming\/","title":{"rendered":"GEN4 ROTOR SHIMMING"},"content":{"rendered":"\n
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Let\u2019s talk shims! Shimming. No, it\u2019s not a dance move, I\u2019m talking about positioning the rotor in your brushless motor and limiting its lateral movement using shims. Shims are included with your Tekin GEN4 motor and the rotor has already been shimmed at the factory. It\u2019s not always perfect, so like gapping your spark plugs (yes you should) even though they are pre-gapped, you should shim your rotor (yes you should) even though it is pre-shimmed. <\/p>\n\n\n\n\n\n\n\n

Why does the rotor position matter? The rotor has North and South Poles and as it rotates, the magnetic fields of these poles are picked up by the 3 Hall effect sensors on the sensor board. This info is then read by the ESC and the ESC now knows the rotor position. Knowing the rotor position, the ESC can time when to fire each phase in the motor and keep the rotor spinning smoothly and under control. Fire at the wrong time, bad things happen much like misfiring in an internal combustion engine. Misfiring can damage your ESC and be really hard on all of your equipment, so it\u2019s important to keep the ESC happy!

So what do we need? The GEN4 motors come with shims in a little bag for your shimming convenience. We also sell Precision Stainless shim kits: <\/p>\n\n\n\n

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GEN4 Precision Stainless Shim Kit – TT3857<\/a><\/p>\n\n\n\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nAnd\nPrecision Teflon Low Friction shim kits: \n\n\n\n<\/p>\n\n\n\n

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GEN4 Precision Teflon Shim Kit – TT3858<\/a><\/p>\n\n\n\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nThere\nare also shims already placed on the rotor, but you may need to adjust the\npositioning or limit some of the rotor float or movement. Below is a graphic\nthat illustrates what to shoot for!\n\n\n\n<\/p>\n\n\n\n

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Let me explain what this is saying to do. You want to set the Sensor Gap first and as shown above, .5mm to 1mm is your target. The easiest way to do this and verify it\u2019s within spec is to remove the rotor and the sensor PCB from the motor entirely. Once the Sensor Gap is set, shims are used on the front of the rotor to control the rotor float range. <\/p>\n\n\n\n

So let\u2019s do this, grab a 2mm, 1.5mm and a feeler gauge if you have one! Feeler gauges are cheap and will help with shimming your sensor gap, you can find them online or any any auto parts store. Plastic or Stainless work best so the tabs don\u2019t stick to the rotor while you\u2019re trying to measure! <\/p>\n\n\n\n

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Start by removing the 3 screws on the shaft side of the\nmotor with a 2mm driver.<\/p>\n\n\n\n

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Pull the rotor out and be careful to locate all shims. You\ndon\u2019t want to lose them and you definitely don\u2019t want them to stick to your\nrotor or somewhere inside the stator!<\/p>\n\n\n\n

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Next, remove the 3 screws on the end bell with a 1.5mm and\npull the end bell off. The sensor PCB is attached with 3 small screws, you can\nleave it assembled.<\/p>\n\n\n\n