We all know that the switched reluctance motor has the characteristics of energy saving, which is very different from other similar products, which is also closely related to the structure of the product. In order to let everyone understand more intuitively, this article introduces the relevant information about the structure in detail.
Switched reluctance motors generate torque by attracting a magnetic salient pole rotor to the stator magnetic field. However, the number of stator poles is relatively small. The magnetism of the rotor is significantly simpler due to the tooth profile rather than an internal flux barrier. Differences in the number of poles in the stator and rotor cause the vernier effect, and the rotor typically rotates in opposite directions and at different speeds to the stator field. Usually pulsed DC excitation is used, requiring a dedicated inverter to operate. Switched reluctance motors are also significantly fault tolerant. Without magnets, there is no uncontrolled torque, current, and uncontrolled generation at high speed under winding fault conditions. Also, because the phases are electrically independent, the motor can operate with reduced output if desired, but when one or more phases are inactive, the motor’s torque ripple increases. This can be useful if the designer needs fault tolerance and redundancy. The simple structure makes it durable and inexpensive to manufacture. No expensive materials are required, the plain steel rotors are perfect for high speeds and harsh environments. Short distance stator coils reduce the risk of short circuits. In addition, the end turns can be very short, so the motor is compact and unnecessary stator losses are avoided.
Switched reluctance motors are ideal for a wide range of applications and are increasingly used in heavy material handling due to their large breakaway and overload torques, where the main problem with products is acoustic noise and vibration. These can be controlled through careful mechanical design, electronic controls, and how the motor is designed to be applied.
Post time: Apr-29-2022