Switched reluctance motor drive system has high reliability and excellent performance. It is a new type of drive system and is gradually replacing other speed control products in the industrial field. This article compares this system with the mature asynchronous motor variable frequency speed regulation system to see what is the difference between the two.
1. Comparison of electric motors: The switched reluctance motor is stronger and simpler than the asynchronous motor. Its outstanding advantage is that there is no winding on the rotor, so there will be no poor casting, fatigue failure and high speed caused by the cage rotor of the asynchronous motor. Due to limitations and other issues, switched reluctance motors are generally lower in manufacturing cost and less difficult to manufacture than squirrel-cage asynchronous motors.
2. Comparison of inverters: Switched reluctance motor power converters have an advantage over asynchronous motor PWM inverters in terms of cost. The characteristic of the switched reluctance motor drive system is that the phase current flows in one direction and has nothing to do with the torque, so that each phase can only use one main switching device to control the system to achieve four-quadrant operation, while the asynchronous motor PWM inverter has In addition, because the main switching devices of the asynchronous motor voltage-type PWM inverter are connected to the power supply one by one, there is a potential fault that the upper and lower bridge arms are connected directly due to false triggering and the main circuit is short-circuited.
3. Comparison of system performance: The switched reluctance motor with double salient pole structure is compared with the asynchronous motor PWM inverter, especially in the ratio of torque / moment of inertia. In addition, the switched reluctance motor has the characteristics of a high-performance controllable DC motor, and the control is more flexible and convenient than the variable frequency speed control system. It can obtain various torques by controlling the on and off times of the phase windings. /speed characteristics.
Through the introduction of this paper, it is not difficult to see that the switched reluctance motor drive system has shown strong competitiveness and has great advantages compared with traditional systems.
Post time: Apr-28-2022