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PMSM Scalar Drives

The motor is categorized as PMSM or sinusoidal PMSM or PMAC when the stator windings are sinusoidally distributed and the magnets are shaped to induce a sinusoidal back-EMF voltage waveform in each motor phase by the rotor spinning.

Due to the back-EMF shape, sinusoidal PMSMs are specifically optimized to develop nearly constant output torque when excited with a 3-phase sinusoidal current waveform. To avoid giving a high-voltage value based on the current frequency, a V/F limitation curve is used to fix the maximum voltage value supplied for the stator frequency.

Design Support


Technical Documentation

Application Notes

Description Version Size
AN1947: ST7MC PMAC sine wave motor control software library
2.2 600 KB
AN2281: Low cost self-synchronizing PMAC motor drive using ST7FLITE35
1.3 1,124 KB

Publications and Collaterals

Conference Paper

Description Version Size
An Improved Microcontroller-Based Sensorless Brushless DC (BLDC) Motor Drive for Automotive Applications
1.0.0 713 KB
An Improved Microcontroller-based Sensorless Brushless DC (BLDC) Motor Drive for Automotive ApplicationsĀ 
301 KB
Further Improvement of Direct Back EMF Detection for Sensorless Brushless DC (BLDC) Motor Drives
1.0.0 361 KB
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