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questions :Reluctance start 1phase induction motor
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[Member (365WT)]answers [Chinese ]Time :2019-10-18
Reluctance motor, a continuously operating electric drive, its structure and working principle are very different from traditional AC and DC motors. It does not rely on the interaction of the magnetic field generated by the stator and rotor winding currents to generate torque, but relies on the "minimum reluctance principle" to generate torque.

The so-called "magnetoresistive minimum principle", namely: "the magnetic flux always closes along the path of the largest magnetic permeability, thereby generating a magnetic pulling force, thereby forming a magnetoresistive property of electromagnetic torque" and "the magnetic field lines have the effect of shortening the magnetic flux path to reduce Small magnetoresistance and increased permeability of the magnetic permeability."
Therefore, its structural principle is that the magnetic resistance of the magnetic circuit should be changed as much as possible when the rotor rotates. Therefore, the stator and rotor of the motor are double salient pole structure and are laminated with silicon steel sheets. A simple concentrated winding is mounted on each of the stator poles, and the windings on the two diametrically opposed stator poles form a phase in series or in parallel. There are no windings on the rotor and no permanent magnets. According to the number of phases of the motor, it can be divided into an odd phase and an even phase. According to the magnetic circuit structure of the motor, it can be divided into a two-pole type long magnetic circuit structure and a quadrupole short magnetic circuit structure. According to the energized excitation mode of the motor, there are single-phase excitation and multi-phase excitation.
A double salient permanent magnet motor is another form of reluctance machine. It differs from ordinary reluctance motors in that permanent magnets are mounted on each of the motor teeth. When the motor is running, when the magnetic field generated by the stator winding is the same as the direction of the permanent magnet magnetic field, the magnetic field can flow from the tooth. When the magnetic field generated by the stator winding is opposite to the magnetic field of the permanent magnet, a loop is formed inside the tooth, and the magnetic field cannot pass through the tooth portion. This is like a magnetic circuit switch, hence the name. The advantage of a switched reluctance machine is that the maximum torque of the motor will increase due to the presence of permanent magnets. But every cycle, the power of the permanent magnet is zero. That is, the permanent magnet does not provide energy, and the torque ripple of such a motor will increase.

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