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 is a reluctance motor used for?
A reluctance motor is a type of electric motor that induces non-permanent magnetic poles on the ferromagnetic rotor. The rotor does not have any windings. It generates torque through magnetic reluctance.
What are the benefits of switched reluctance motor?
Advantages and disadvantages
A switched reluctance motor offers many benefits against other types of electric motors because of its control flexibility, simple structure, lower cost and high efficiency.
Which properties makes switched reluctance motor suitable for electric traction?
Switched reluctance motors (SRM) have a simple and robust structure, thus they are generally suitable for high-speed applications. High-speed motors have the advantage of high power density, which is an important issue of traction motors in electric vehicles (EV).
Why switched reluctance motor do not work well as generator?
In contrast to well-known conventional generators Switched Reluctance Generator (SRG) have “toothed” stator and rotor, and have neither windings nor permanent magnets in the rotor. For their operation the excitation unit which is controlled in accordance with the rotor angle position is nec- essary.
Is switched reluctance motor self starting?
Thus Switched reluctance motors are self-starting motor. The control circuit continuously monitors the motor speed and input current.
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.
What are the disadvantages of switched reluctance motor?
The switched reluctance motors drives (SRDs) need more advanced control technology than DC and AC motors drives. High torque ripple, high noise and vibrations are the most important drawbacks of the SRM .
How do you control a reluctance switched motor?
3. Control techniques
- 3.1 Voltage impulse control. The impulse control is the simplest controller for the SRM. …
- 3.2 Current control. The voltage is kept constant in the last controller, expecting the current to be constant as well. …
- 3.3 Torque control.
Is switched reluctance motor AC or DC?
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.
Which sensor is used in switched reluctance motor?
An inductive position sensor with switched reluctance motor structure. Abstract: Position sensors like hall sensors, optical encoder and electromagnetic sensors are widely used in motor drive systems for providing reliable rotor positions for the motors like switched reluctance motors and brushless DC motors.
What are the types of power controllers used for switched reluctance motor?
Abstract— This paper presents requirements, detailed analysis, and operation of six converter types used with 3- phase 6/4 switched reluctance motor (SRM). These converters are R-dump, C-dump, C-dump with freewheeling transistor, asymmetric, series, and parallel type.
Is switched reluctance motor synchronous?
Note: when you google “reluctance” motors, there are two styles…the “switched” reluctance, and also “synchronous” reluctance. They use very similar principles. A Synchronous Reluctance motor has the same number of magnetic poles in the stationary stator and the rotating rotor.
Who invented the switched reluctance motor?
A breakthrough came from W. H. Taylor in 1838, who obtained a patent for an electromagnetic engine in the United States. This machine was composed of a wooden wheel on the surface, on which was mounted seven pieces of soft iron equally spaced around the periphery.
What is switched reluctance motor and compare it with conventional?
The load is switched to the coils in sequence to synchronize the current flow with the rotation. Such generators can be run at much higher speeds than conventional types as the armature can be made as one piece of magnetisable material, as a slotted cylinder.
Why rotor position sensor is used in switched reluctance motor?
It is necessary to use a rotor position sensor for commutation and speed feedback. The turning on and off operation of the various devices of power semiconductor switching circuit are influenced by signals obtained from rotor position sensor.