In some cases, the motor may not achieve the imposed speed, even it is lower than the nominal speed of the motor.
Below are presented the main reasons that can cause the motor speed limitation.
1. Bad tuning - if current controller parameters is not done correctly, then it can happen that the motor looses the synchronization even at lower speeds.
2. The Run Current is too small.
Remark: The "Run Current" is the maximum current that the drive allows to flow through the motor winding.
3. The acceleration can also influence the speed limit. In order to be able to accelerate fast you need to make sure that you don't loose synchronization at the give run current and system inertia. In this case is recommended to decrease the acceleration value.
4. Insufficient supply voltage. The speed of a motor is computed with the simple formula "e = K x Omega", where
e - back emf of the motor
k - flux constant
Omega - motor speed
If this is the case, in order to increase the speed limit, you need to either increase the Vdc supply voltage or choose a motor with a smaller back-EMF constant [V/rad/s].
Categories 