The trapezoidal permanent magnet synchronous motor (also known as brushless DC motors)

Introduction
Trapezoidal wave (square wave) magnetic field of permanent magnet synchronous motor rotor makes the spatial distribution of the stator on the rotor rotates counter-electromotive force generated for the trapezoidal wave. Working in the motor winding current waveform also showed ladder. Type of motor is sometimes referred to as "brushless DC motor." This kind of motor with control simple, low cost, can save the speed / position sensor and so on.
Model
150kW Permanent Magnet Motor for EV/REEV, Water Cooled
Advantage
This motor torque ripple is high, easy to produce noise at high speed, low speed Shiyou difficult to obtain a smooth torque.

Trapezoidal wave (square wave) magnetic field of permanent magnet synchronous motor rotor makes the spatial distribution of the stator on the rotor rotates counter-electromotive force generated for the trapezoidal wave. Working in the motor winding current waveform also showed ladder. Type of motor is sometimes referred to as "brushless DC motor." This kind of motor with control simple, low cost, can save the speed / position sensor and so on. However, the trapezoidal wave permanent magnet motor in principle with the inherent electromagnetic pulse, that the motor torque ripple is high, easy to produce noise at high speed, low speed Shiyou difficult to obtain a smooth torque. Trapezoidal wave permanent magnet motor, therefore only be used in hybrid / electric vehicle attachment system (such as: electric pumps, air compressors, etc.). In many less demanding, non-"car class" areas, such as electric bicycles, of the motor, has a broader application.