Classification of synchronous motor

According to different excitation modes, synchronous motors can be divided into electrically excited synchronous motor with permanent magnet synchronous motors.

Electro-magnetic

It made explicit the rotor pole, mounted on poles above the core's magnetic field coils are in series with each other, alternating with opposite polarities, and has two leads connected to slip rings mounted on the axle of the two above. Magnetic field coil is inspired by a small direct current generator or battery, in the majority of synchronous motor, DC generator is mounted on the motor shaft, to supply of rotor magnetic pole coil excitation current. Due to the synchronous motor does not start automatically, so in was also equipped with squirrel-cage rotor winding as the motors start. Squirrel-cage winding on the rotor around the structure is similar to induction motors.

When on the stator windings of AC power, the motor creates a rotating magnetic field cage cut magnetic lines of force and induced current, so as to make the motor spin. After the motor, slowly increased it to slightly less than the speed of the rotating magnetic field, rotor field coil incentives through DC, causes the rotor to form a certain degree of magnetic poles, the Poles tried to track the rotation of the stator poles, which increases motor speed until the synchronized with the rotating magnetic field rotation so far.

Permanent magnet

Rotor excitation synchronous motor can be used on Yu Danxiang power supply, can also be used in multi-phase power supply. The electric motor, stator winding with a split-phase motor or multiple phase motor stator similar to, and a squirrel-cage rotor, rotor cut into the surface of the plane. Is pole rotor, rotor is made of a magnetized steel, and will always have a magnetic. Cage is used to produce starting torque, and when the motor is rotated to a certain speed, rotor with the stator winding current frequency and synchronize. Polarity of the salient poles from stator induction, which echo the number equal to the number of poles on the stator, when the motor is transferred to its proper speed, cage lost, maintenance of rotating rotor and magnetic pole is leaning with the stator poles, synchronous