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3相6步控制

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在6步或标量控制中,通常只控制输入电机的电压频率和大小(电流反馈不是强制的)。对于永磁3相电机(BLDC,PMSM),需要其转子速度和/或位置信息,以便保持定子和转子磁场位置同步。如果在不使用物理传感器(霍尔)传感器,编码器等)的情况下获得转子速度/位置信息,则该驱动被称为“无传感器式”。 六步(也称为阻塞换相)驱动是可用于PMSM和BLDC的最常见标量驱动之一,因为它可以轻松实现无传感器控制。另外,当六步驱动处于电流模式时,可以控制电机电流的幅值,从而调节电机转矩。由于标量驱动不需要复杂的数学计算,可以在性价比高的微控制器(从8位开始)上实现。 Read more

Permanent magnet 3-phase motors

For permanent magnet 3-phase motors (BLDC, PMSM) rotor speed and/or position information is required in order to keep stator and rotor flux positions synchronous. In cases where the rotor speed/position is obtained without using physical sensors (Hall, encoders, etc.) the drive is referred to as sensorless. A six-step drive (also known as block commutation) is one of the most common scalar drives available for both permanent magnet synchronous motors (PMSM) and brushless DC (BLDC) motors, due to the ease with which sensorless control can be achieved. Additionally, when a 6-step drive is in current mode the amplitude of the motor current can be controlled, allowing the motor torque to be regulated. As scalar drives do not require complex mathematical computations, they can be implemented on cost-effective microcontrollers (starting from 8-bit).