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Old 04-28-2008, 03:53 PM   #1
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Default What is cogging?

Sorry about stoopid question...

first brushless system..
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Old 04-28-2008, 04:01 PM   #2
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Wat brushless u running. Not sure, but usually at low RPM's the motor will hessitate hard to explain. We found it to usually be a low voltage condition.
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Old 04-28-2008, 04:22 PM   #3
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it's when your car starts to jerk when accelerating
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Old 04-28-2008, 04:32 PM   #4
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As far as it's my understanding, cogging in a BL motor happens when the ESC loses track of the rotor. When there's no load on the motor, as each pair of armature stacks in the can fires the rotor follows and life's good. But if enough of a load is placed on the rotor (i.e., hard acceleration under the weight of the car) that it slows down, there's a chance that the stack's firing can get far enough ahead of the rotor that the easiest path for the rotor to take is backwards. Of course, this happens so fast all you get is this strange buzz and the motor tripping flat on its face instead of running.

That's the big advantage to sensored systems, the sensor tells the ESC where the rotor is so if it starts to fall behind, the ESC can automatically slow down the firing sequence & let the rotor catch up. Sensorless systems, the ESC just keeps sending power 'round and 'round the can regardless of the rotor's position.
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