3-phase 6-STEP Control
详情介绍
In a 6-step or scalar control, normally only the frequency and magnitude of the voltage fed to the motor are controlled (current feedback is not mandatory). For permanent magnet 3Φ 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 “sensor-less”. A six-step (also known as block commutation) drive is one of the most common scalar drives available for both PMSM and BLDC motors, due to the ease with which sensor-less control can be achieved. Additionally, when a six-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).
