Third-harmonic excitation synchronous motor

Abstract

The invention discloses a third-harmonic excitation synchronous motor. The third-harmonic excitation synchronous motor comprises a motor case, a stator core, a stator armature winding, a stator third-harmonic winding, a rotor core, a rotor excitation winding, a rotor harmonic winding and a rotary shaft, wherein the armature winding and the third-harmonic winding are arranged in a stator groove, a magnetic pole body is sleeved with the excitation winding, the harmonic winding is arranged in a rotor groove, the short circuit of the third-harmonic winding is achieved through an anti-parallel thyristor, the phase position of trigger pulses of the thyristor is given by an excitation controller, and the excitation winding and the harmonic winding are connected through a diode rectification circuit. According to the third-harmonic excitation synchronous motor, electromotive force induced by the third-harmonic winding is transmitted to the excitation winding for excitation through the magnetic coupling between the stator third-harmonic winding and the rotor harmonic winding, an electric brush and a collecting ring or an alternating-current exciter are omitted, and the third-harmonic excitation synchronous motor has the advantages of being high in reliability, small in maintenance amount, low in manufacturing cost and the like; adjustment of the voltage of a motor end is achieved by controlling the phase position of the trigger pulses of the anti-parallel thyristor, and the third-harmonic excitation synchronous motor further has the advantages of being convenient to control and easy to adjust.

Description

technical field [0001] The invention relates to an electric excitation synchronous motor, in particular to a novel third harmonic excitation synchronous motor. Background technique [0002] Harmonic magnetic fields in motors exist objectively, and efforts are usually made to weaken or eliminate the influence of harmonics on motor performance. However, under the premise of not affecting the performance of the motor, using harmonics for excitation is a clever use of the harmonic magnetic field in the motor. Since the 1970s, some domestic scholars and technicians in electrical machinery factories began to study the use of the third harmonic magnetic field in the air gap, and successfully applied it to the excitation system of synchronous generators, forming a third harmonic excitation synchronous generator. [0003] The structure of the three-harmonic excitation synchronous motor is similar to that of the ordinary synchronous motor. The difference is that in addition to the a...

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Problems solved by technology

[0004] Compared with the fundamental phase compound excitation, the excitation method using the third harmonic excitation has the advantages of simple circuit, fast response and good phase compound excitation characteristics. However, since the third harmonic winding is on the stator side, it needs the use of brushes and The electric ring is input into the rotor excitation winding to form a brushed third harmonic excitation synchronous generator, or to form a brushless third harmonic excitation synchronous generator with the help of an AC exciter, thereby reducing the reliability of the motor operation and increasing the Efforts for motor maintenance and manufacturing costs

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