The relationship between DC bus voltage and the maximum achievable speed of a Permanent Magnet Synchronous Motor (PMSM) can be influenced by several factors, including the motor’s back EMF constant (
), the control strategy, and the voltage limit imposed by the inverter.
), the control strategy, and the voltage limit imposed by the inverter.Formula for Maximum Electrical Frequency
The formula mentioned in the thread:
is a simplified representation that can be used to estimate the maximum electrical frequency of a PMSM when using a Field-Oriented Control (FOC).
Practical Implementation
When using a C2000 LaunchPad with a BOOSTXL-3PHGANINV and implementing an FOC strategy (as described in the MathWorks example), you should:
- Ensure the motor parameters, especially (
), are accurately measured or provided by the manufacturer. - Consider the maximum voltage that the inverter can apply, which is limited by the DC bus voltage.
- Implement the FOC algorithm to maintain efficiency and stability at high speeds.
Conclusion
While the formula provides a useful estimate, the actual maximum speed achievable in practice may vary due to additional factors like load conditions, motor efficiency, and thermal limits. Testing and tuning your specific setup will be essential to achieving optimal performance.
I hope this helps.
