Protection type brushless excitation synchronous motor

Abstract

A protective brushless excitation synchronous motor includes a stator, a rotor and a frame of the host of the motor, the ends covers of two ends of the frame, a shaft and seat type bearings at two ends of the shaft, an exciting dynamo, a cooling machine and a blower at the upper part of the frame, a rectifying disc and a heater. The invention is characterized in that one of the two end covers is arranged at one side of the frame and is provided with a convex cylinder with an inner diameter larger than a shaft radius; an outer diameter smaller than the inner diameter of the convex edge of the field yoke of the rotor of the host; the magnetic poles of the exciting dynamo are arranged on the outer circle at the end part of the convex cylinder; the stator of the exciting dynamo is embedded in the convex edge of the field yoke of the rotor of the host corresponding to the magnetic poles of the exciting dynamo; the magnetic field of the magnetic poles of the exciting dynamo and the magnetic field of the host are not interfered mutually; the rectifying disc, namely a rectifying module is mounted in the same disc body with a de-excitation resistance; the disc body is mounted on the rotary shaft in the frame at the other end of the exciting dynamo. The invention changes concepts that a stator of a traditional AC motor is externally mounted and static while a rotor is internally arranged and rotable; the host of a brushless synchronous motor and the exciting dynamo are integrated as a body, thus greatly reducing the size of the motor, decreasing the manufacture and maintenance cost of the motor and improving the safety and reliability of the motor.

Description

technical field [0001] The invention relates to a synchronous motor, in particular to a protective brushless excitation synchronous motor. Background technique [0002] Existing brushless excitation synchronous motors include motor host stators, rotors, machine bases, end covers at both ends of the machine bases, shafts and seat bearings, exciters, coolers and blowers, rotating rectifying discs and heaters. This kind of motor does not have carbon brushes and collector rings of traditional synchronous motors, thus eliminating the unsafe factors caused by sparks generated during operation; without carbon brushes, there are no wearing parts, thus eliminating the need for carbon brush replacement and grinding Maintenance work such as collector rings; without carbon brushes, there is no carbon brush dust, thus improving the operating environment and the cleanliness of the motor. However, in the existing brushless synchronous motors, the exciter and the main engine are installed ...

AI Technical Summary

Problems solved by technology

However, in the existing brushless synchronous motors, the exciter and the main engine are installed separately, and the rotor of the exciter is installed on the shaft outside the main frame. resistance, so that the motor shaft is very long, the volume becomes large, the installation base is correspondingly expanded, and the investment cost is correspondingly increased

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