Motor speed
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The motor is controlled by an inverter; the speed indicated on the motor’s nameplate is over 1,400 revolutions per minute. The gearbox’s nameplate shows the reduction ratio and speed. Based on the motor’s speed and the reduction ratio, the calculated speed is quite close to the value indicated on the gearbox’s nameplate, around 147 – with a difference of just a few tenths of a revolution per minute. However, the actual measured speed is 154, which is 7 revolutions per minute higher. Is this a normal phenomenon? What is the reason?
1. Drive slip； 2. Measurement error