## How to measure motor parameters of PMSM?

Level 2
Level 2

Hi, I am designing a motor controller of PMSM using XMC4800, and I have a question,  how to measure motor parameters of PMSM?

1 Solution

## Re: How to measure motor parameters of PMSM?

Moderator
Moderator

Hi, @wanglipeng00000 ,

here are some general steps that you can follow:

1. Determine the motor model: Before measuring the parameters of a PMSM, you will need to know its model. The model provides information about the motor's electrical, mechanical, and magnetic properties.

2. Measure the winding resistance: You can use an ohmmeter to measure the winding resistance of each phase of the motor. This value is required to determine the motor's electrical parameters.

3. Determine the inductance: You can use an LCR meter or oscilloscope to measure the inductance of each phase. The inductance value is needed to calculate the motor's electrical parameters.

4. Measure the back EMF constant: You can measure the back electromotive force (EMF) of the motor by rotating the motor shaft with an external torque and measuring the voltage generated across one winding. The back EMF constant is required to calculate the motor's mechanical parameters.

5. Measure the mechanical parameters: You can measure the mechanical parameters of the motor, such as the moment of inertia and friction coefficient, using a dynamometer or torque sensor.

6. Calculate the motor parameters: Using the measurements from the previous steps, you can calculate the motor's electrical, mechanical, and magnetic parameters.

BR,

Owen

## Re: How to measure motor parameters of PMSM?

Moderator
Moderator

Hi, @wanglipeng00000 ,

here are some general steps that you can follow:

1. Determine the motor model: Before measuring the parameters of a PMSM, you will need to know its model. The model provides information about the motor's electrical, mechanical, and magnetic properties.

2. Measure the winding resistance: You can use an ohmmeter to measure the winding resistance of each phase of the motor. This value is required to determine the motor's electrical parameters.

3. Determine the inductance: You can use an LCR meter or oscilloscope to measure the inductance of each phase. The inductance value is needed to calculate the motor's electrical parameters.

4. Measure the back EMF constant: You can measure the back electromotive force (EMF) of the motor by rotating the motor shaft with an external torque and measuring the voltage generated across one winding. The back EMF constant is required to calculate the motor's mechanical parameters.

5. Measure the mechanical parameters: You can measure the mechanical parameters of the motor, such as the moment of inertia and friction coefficient, using a dynamometer or torque sensor.

6. Calculate the motor parameters: Using the measurements from the previous steps, you can calculate the motor's electrical, mechanical, and magnetic parameters.

BR,

Owen