How do you control a reluctance switched motor?

How do you control a reluctance switched motor?

When a stator phase is magnetized, a closed magnetic field is generated between the stator, the air gap and the rotor. This magnetic field tends to minimize the reluctance by reducing the air gap which creates a rotor movement.

How does SRM motor work?

The working principle of the switched reluctance motor is, it works on the principle of variable reluctance that means, the rotor of this motor constantly tries to align through the lowest reluctance lane. The formation of the rotary magnetic field can be done using the circuit of power electronics switching.

Is SRM DC or AC motor?

A Switched Reluctance Motor (SRM) are considered as DC motors that emulate the behaviour of an AC motor by switching the DC current between the stator windings.

What is SRM drive?

The switched reluctance motor (SRM) is an electric motor that runs by reluctance torque. Unlike common brushed DC motor types, power is delivered to windings in the stator (case) rather than the rotor. Its main drawback is torque ripple.

How does a reluctance switched motor work?

Switched reluctance motors operate by switching currents in the stator windings in response to changes in the magnetic circuit formed by the rotor and stator. As the stator pole pairs are energized, the rotor turns to align with the energized stator poles, which minimizes the reluctance of the magnetic circuit.

What is the difference between reluctance motor and induction motor?

Induction motors develop torque because of a slip between the speed of the rotor and the speed of the magnetic flux rotating around the stator winding. In the switched-reluctance design, however, the magnetic field in the rotor is time varying.

What is the difference between SRM and stepper motor?

Switched reluctance motors have fewer poles and a larger stepping angle than stepper motors. The fact that both the stator and rotor have salient poles (referred to as a doubly salient design) means switched reluctance motors produce more audible noise than stepper motors.

Where are switched reluctance motor used?

Switched reluctance motors are especially suitable for a variety of coal mining equipment, such as cutters, conveyors and coal ploughs. This type of motor provides a low starting current and a high torque (30% of rated current gives starting torque up to 150%).

What causes torque ripple?

Dr. Nir Vaks: Torque ripple is created by harmonics in the electromagnetic torque, which exist in all electric machines regardless of type or design. The harmonics are created by non-idealities in the electromagnetic fields produced by the rotor and stator interaction.

What is the principle of reluctance motor?

Reluctance motors operate on the principle that forces are established that tend to cause iron poles carrying a magnetic flux to align with each. One form of reluctance motor is shown in cross section in the figure.

Why the reluctance motor has low efficiency?

This is due to variable reluctance throughout a rotor revolution. There is no practical application for a large synchronous reluctance motor. Low power factor, low pull-out torque, and low efficiency are characteristics of the direct power line driven variable reluctance motor.