Determine whether the China series dc motor is constant torque or constant power
When many permanent magnet DC motors are used, it is not known whether the permanent magnet DC motor is constant torque or constant power. For these two concepts, Shenzhen Longhui Motor Factory gives a detailed introduction as follows:
Permanent magnet DC motor constant torque or constant power, can not only look at the motor, but also look at the control system.
In the DC motor speed control system with speed loop, voltage loop and current loop, non-independent excitation, these two operating states are available.
When the magnetic field is constant and the armature current is constant, the armature voltage is changed to adjust the speed, and the constant torque is adjusted. The operating state at this time is constant torque operation. Above the base speed, when entering the weak magnetic speed increase, the armature voltage is constant, and the speed is adjusted by changing the magnetic field excitation, which is constant power speed regulation. The operating state at this time is a constant power operation. If the armature current is not kept constant, it will only turn when the power is turned on. If the power is off, the torque and current will fluctuate with the load, so it cannot be regarded as constant torque speed regulation; nor is it constant power speed regulation. If you use a DC permanent magnet brush motor, the magnetic field is constant. If your control system has current control, you can keep the armature current constant, and change the armature voltage to adjust the speed. That is constant torque regulation.
