Difference Between BLDC And PMSM Motors, Brushless DC Motor
Hello guys, welcome back to our blog. In this article, we will discuss the difference between BLDC and PMSM motors, brushless dc motors, and permanent magnet synchronous motors.
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Difference Between BLDC And PMSM Motor
Brushless DC Motor (BLDC)
Construction of the BLDC motor says that the Permanent magnet act as a rotating part of the motor called the rotor & stationary part of the motor is made of coil windings called the stator.
BLDCM is working on the Lorentz principle which states that whenever we placed a current-carrying conductor in a magnetic field it experiences a force. Hear current-carrying conductor is the stator’s coil so the PM rotor experiences force and starts rotating. Stator windings in a trapezoidal manner so DC current is required to run the motor.
Hence, the motor will generate trapezoidal back emf & produce torque repulsion. BLDC motor has poor performance because torque and efficiency are affected by torque repulsion. In addition, the BLDC motor is an upgraded version of a brushed DC motor and the absence of brushes gives high speed and increased efficiency.
Permanent Magnet Synchronous Motor
The construction of a PMSM is the same as a BLDCM.
The working principle of PMSM is the same as a synchronous motor, when stator windings are energized rotating magnetic field is produced & emf created rotor is affected by this force and starts rotating at synchronous speed.
The difference is the coil wound over the stator and it is in a sinusoidal manner. So, AC current is required to run the motor. Hence, the motor will generate sinusoidal back emf & produce low torque repulsion.
Due to low torque repulsion, PMSM got higher and smooth torque with higher efficiency and low noise compared to BLDCM. PMSM has a higher power density, which will help in reducing the size of the motor. That’s why PMSM is better than BLDC motors in terms of performance and is good to use in electrical vehicles.
Difference Between BLDC And PMSM Motor
| Operation | BLDC Motor | PMSM |
| Current required | DC | AC |
| Back EMF wave | Trapezoidal | Sinusoidal |
| Torque ripple at commutation | Present | Absence |
| Performance | Poor | Good |
| Cost | Low | High |
| Torque and Efficiency | Lower | Higher |
| Noise | Lower | Lower |
| Efficiency | 85% to 90% | 92% to 97% |
This was about the “Difference Between BLDC And PMSM Motor“. I hope this article may help you all a lot. Thank you for reading.
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