This is why BLDC motors can use trapezoidal or sinusoidal commutation. Trapezoidal (aka six-step) commutation is common in high-speed applications or when higher In a typical three-phase BLDC motor with trapezoidal current, one winding is positive, one winding is negative, and one is open.
The PMSM is a cross between an induction motor and brushless DC motor. Like a brushless DC motor, it has a permanent magnet rotor and windings on the stator. However, the stator structure with windings constructed to produce a sinusoidal flux density in the air gap of the machine resembles that of an induction motor.
The new NI SoftMotion Module we just released contains new officially supported IP blocks for power electronics control, including Trapezoidal and Space Vector commutation for three phase PMSM/BLDC motor/generators and inverters, Clarke and Park transforms, special PID control algorithms, etc.. Thes...
As the phase current is trapezoidal, we call 6-step BLDC control trapezoidal control. The difference between the required speed and the actual speed is input into the PI controller, which Hall Sensor Failure - In sensor-based BLDC motors, rotation of the motor is based solely on the feedback...