What is the effect of high DC motor startup frequency?

Update:28 Jun 2018
Summary:

Description of content: In order to start normally, the […]

Description of content: In order to start normally, the starting frequency should not be too high, and gradually increase the frequency when the motor starts. If the pulse frequency is too high at start-up, the speed of the rotor cannot keep up with the speed at which the stator field rotates.

The starting frequency of the DC motor cannot be too high. This is because when the DC motor has just started, the rotation speed is zero. In the starting process, in addition to overcoming the load resistance torque, the electromagnetic torque still overcomes the inertial masking of the rotating part, so the motor is started. The burden is more important than continuous operation.

If the pulse frequency is too high at the start, the speed of the rotor cannot keep up with the speed of the rotation of the stator magnetic field, so that the position of the first step lags behind the equilibrium position. In the following steps, the rotor speed does not increase much, and the stator magnetic field remains The forward rotation is performed at a speed proportional to the pulse frequency, so that the distance between the rotor and the equilibrium position becomes larger and larger, and finally, the rotor position falls out of the dynamic stability zone and a step-out or oscillation phenomenon occurs, thus making the motor unable to start.

The starting frequencies of various DC motors are different. Engineers who specialize in miniature stepper motors and stepper motor drivers are the engineers of axis axis electromechanical engineers. They recommend that the starting frequency must be determined according to the motor specification data. Many high starting frequency motors use dual voltages. The operation changes from high pressure to low pressure at the moment of starting, and the smaller the step, the more suitable it is for high-frequency startup. The higher the power, the more suitable it is for high-frequency operation. The
In order to start normally, the starting frequency cannot be too high, and the frequency will be gradually increased when the motor starts.