The reluctance:

The reluctance motors using the simplest of all electrical machine rotors and is one of the oldest technologies known to the engine from the year 1838 that Robert invention Davidson, but not adopted until recently. We use permanent or electromagnets of the rotor, which is simply the magnetic materials such as soft iron is built. In recent years, many variations of the reluctance motor has been developed. Variable and switched reluctance motors operate in essentially the same principles, but are optimized for different applications. Both are modern engines, similar to the permanent magnet brushless DC motors, except that the impeller is made of iron and not of permanent magnets. The so-called "reluctance synchronous motor" has a different structure and functions somewhat differently.

Variable reluctance motor (VRM) :

The variable reluctance motor is a stepper motor of development and has generally developed for use in low power, open loop position and speed control systems, where efficiency is paramount.

Switched reluctance motor (SRM):

The switched reluctance motor is designed for use in high performance, high efficiency, variable speed drives can provide a range torque. The systems use closed-loop position control. Reluctance synchronous motor The reluctance synchronous motor is comparable to an AC current machine as described in the section on AC power. The rotor has salient poles, however, the stator is smooth, which is distributed in Poland and both transfer and variable engine main poles for both the rotor and stator.

Switching and Variable Reluctance:

Given the similarities, the principles of switching and variable reluctance motor described here together. Both are modern engines similar to the brushless motors with permanent magnets listed above, except that the rotors are manufactured from laminated soft magnetic materials are structured to be a prominent poles. Home If a piece of magnetic material are allowed to move freely in a magnetic field will align with the magnetic field to minimize the reluctance of the magnetic cycle. To put it another way, the piece is towards the magnetic poles to create guided field. (This also results in the maximization), the inductance of the coil field.

The moment the cursor is created in this way, such as reluctance torque. If the grooves or spaces between the poles than rotor poles of the stator magnetic circuit is driving a high magnetic resistance, but when the rotor of the stator poles are the poles of the magnetic circuit designs a small magnetic resistance. When a stator pole pair nearest rotor pole pair is active will be in accordance with the energized stator poles to minimize the reluctance path through the machine. As for brushless motors with permanent magnets, rotary motion is made by the successive activation of stator causing the rotor to the next step energized poles. A multi-inverter stage spurs respective pole pairs based on the shaft.

Stimulation of stator poles must be placed so precisely position the cursor to appear as the rotor pole is approaching the race. The reluctance of the motor requires feedback thus able to convert phase motor. This control feedback can be achieved by positioning sensors such as encoders or Hall-sensors for the feedback rotor angle to the collector at the appropriate point triggers available.

Sensorless position control is also possible at the expense of complex electronics and software. Motor torque and efficiency by synchronizing the phase change controller with the position of the cursor so that the torque angle is optimized held in maximum of 90 degrees.

They simplify complex electronic check on the availability of cheap, DSPs Practical motor designs is doubly important (both the stator and rotor poles are important) with a number of stator and rotor poles. The rotor is, however, allow generally smaller than the actual stator pole away and interactive control.

As the rotor is a permanent magnet, but made of iron, does not produce back EMF, so the engine is much higher speeds than comparable motors with permanent magnets to achieve. The machine does not need exciting sinusoidal waveforms for efficient operation, can maintain higher torque and efficiency in a wider speed range than is possible with other advanced variable speed systems.

Due to the double projection, the design suffers from torque ripple, structural resonances, and the volume and variety of methods such as multiple rods with hooks, and their design to accommodate these variations.

The switched reluctance machine can be driven to a generator.