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How to Choose a Suitable Motor Based on the Inductance and Resistance?

For low speed and high torque (below 200RPM), it is more appropriate to choose a motor with high inductance and high resistance. when high speed and high performance are required, it is more appropriate to choose a motor with low inductance and small resistance.

High inductance and high resistance motor:

The advantage is that the required torque can be achieved by using a relatively small current, so you can choose a driver with a smaller current, which will be much better in terms of heating, stability and noise of the driver and motor.
The disadvantage is that it cannot go up at high speeds, and the torque decays quickly at high speeds.

Low inductance and low resistance motor:

The advantages are that the driver has higher voltage and current at high speed, its no-load starting and operating frequency are higher, the motor has better hard characteristics, and the torque decays slowly with speed.
The disadvantages are that the current will be very large, the voltage will be relatively high, the heat will be large, and it is difficult to control the noise; the performance requirements for the driver are also relatively high.

Note: It does not mean that the greater the phase resistance and inductance, the greater the holding torque! Rather, under the same voltage and current conditions, the greater the inductance and resistance, the greater the driving capability.

Updated on: 22/11/2023

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