Servo drive operating mode
The open-loop mode input command voltage controls the output load rate of the driver. This mode is used for brushless motor drives and is the same voltage mode as brushed motor drives.
Voltage mode Input command voltage controls the output voltage of the driver. This mode is used for brushed motor drives and is the same as the open loop mode for brushless motor drives.
Current mode (torque mode) The input command voltage controls the output current (torque) of the driver. The driver adjusts the load rate to maintain the command current value. If the drive can work with a speed or position loop, this mode is generally included.
IR compensation mode input command controls motor speed. The IR compensation mode can be used to control the speed of the motor without speed feedback device. The driver adjusts the load rate to compensate for changes in output current. When the command response is linear, the precision of this mode is not as good as that of the closed-loop speed mode in the case of torque disturbance.
Hall Speed mode Input command voltage controls motor speed. This mode uses the frequency of the hall sensor on the motor to form a speed closed loop. Due to the low resolution of the hall sensor, this mode is generally not used for low-speed motion applications.
Encoder speed mode Input command voltage controls motor speed. This mode uses the frequency of the encoder pulse on the motor to form a speed closed loop. Due to the high resolution of the encoder, this mode can be used for smooth motion control at various speeds.
Tachometer mode input command voltage control motor speed. In this mode, the speed closed loop is formed by using the analog tachometer on the motor. Since the voltage of DC tachometer is analog continuity, this mode is suitable for high precision speed control. Of course, at low speeds, it is also susceptible to interference.
Analog position loop mode (ANP mode) Input command voltage controls the rotation position of the motor. This is actually a variable speed mode that provides position feedback in an analog device (such as an adjustable potentiometer, transformer, etc.). In this mode, the motor speed is proportional to the position error. It has faster response and smaller steady-state error.