What is the difference between switched reluctance motor and stepper motor?
The only difference between the switched reluctance motor and the stepper motor is that the turn-on and turn off angles of the SRM are controllable, while the stepper motors are fixed.1, switched reluctance motor has a larger motor utilization factor, which can be 1.2~1.4 times of the coefficient of the induction motor.
Structure 4, switch reluctance motor rotor speed limit of small, can be made of high speed motor, and the rotation of the rotor inertia is small, every change in current at any time change the size and direction of torque can turn phase, thus the system has good dynamic response.5, SRD system can pass through the current on, off and amplitude control, to meet the different load requirements of the mechanical characteristics, easy to achieve the system soft start and four quadrant operation and other functions, flexible control. And since the SRD system is self synchronous, it does not appear unstable and oscillatory at low frequencies, like an induction motor with variable frequency power supply.6, because SR switched reluctance motor adopts unique structure and design method and corresponding control skills, its unit processing can compare with induction motor, even even slightly advantage. The efficiency and power density of the SRD system can be maintained at a wide range of speeds and loads.
2. The structure of the motor is simple, the rotor does not have any form of winding; the stator has only a simple central winding, the end is shorter, there is no inter phase cross wiring. Therefore, the utility model has the advantages of less manufacturing process, low cost, reliable work, small maintenance, etc..3, switch reluctance motor torque and current polarity not only need the current incentive way, the ideal public conversion circuit in each phase can use a switch element, and connected in series with the motor winding, not like the PWM inverter power supply, there is a risk of the two switches straight through. Therefore, the switched reluctance motor drive system has the advantages of simple SED circuit, high reliability and lower cost than the PWM AC speed regulation system.
