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High-speed operation of the grounding switch motor and simple and reliable circuit

May 09, 2019

The grounding switch motor is simple in structure, low in cost and can be used for high-speed operation. The outstanding advantage in operation is that there is no winding of any kind on the rotor, so there is no casting failure and use in the manufacturing process of the squirrel cage induction motor. Problems such as broken bars in the process. Its rotor is extremely mechanical and can be used for ultra-high speed operation (eg tens of thousands of revolutions per minute). In terms of the stator, it has only a few concentrated windings, so it is easy to manufacture and has a simple insulation structure.


The power circuit of the grounding switch motor is simple and reliable. In operation, because the torque direction of the electric motor is independent of the direction of the winding current, the single-phase winding current is required in the operation, so the power circuit can achieve one power switch per phase. In contrast to the asynchronous motor windings, two-way current flows, and the PWM inverter power circuit that supplies power to it requires two power devices per phase.


The grounding switch motor switching reluctance motor speed control system has fewer power components than the PWM inverter power circuit, and the circuit structure is simple. In addition, in the PWM inverter power circuit, two power switching tubes per bridge arm directly straddle the DC power supply side, and it is easy to cause a through-short-circuit to burn the power device. In the switched reluctance motor speed control system, each power switching device is directly connected in series with the motor winding, which fundamentally avoids the through-short phenomenon. Therefore, the protection circuit of the power circuit in the variable speed system of the switched reluctance motor can be simplified, that is, the cost is reduced, and the work reliability is high.