The influence of the starting frequency of cheap 230v dc motor is too high
The starting frequency of the DC motor should not be too high. This is because the speed of the DC motor is zero when it is started. During the starting process, the electromagnetic torque overcomes the inertia mask of the rotating part in addition to the load resistance torque, so the motor is started. The burden is heavier than continuous operation.
If the pulse frequency is too high at start-up, the speed of the rotor will not keep up with the speed at which the stator magnetic field rotates, so that the position where the first step is completed is far behind the equilibrium position, and the rotor speed is not increased much in the subsequent steps, while the stator magnetic field is still It rotates forward at a speed proportional to the pulse frequency, so the distance between the rotor and the equilibrium position becomes larger and larger. Finally, the rotor position is out of the dynamic stability zone and the step-out or oscillation phenomenon occurs, so that the motor cannot be started.
The starting frequency of various DC motors is different. The engineers who focus on the micro stepping motor and the stepping motor driver industrial control product program expert letter axis electromechanical suggestion need to determine the starting frequency according to the motor description data. Many high starting frequency motors use double voltage. The operation starts from the high voltage to the low voltage, and the smaller the step size, the more suitable for high frequency start. The higher the power, the more suitable for high frequency operation.
In order to start normally, the starting frequency should not be too high. When the motor starts, gradually increase the frequency.
