Stator core with winding for medium-sized low-voltage variable-frequency motor

Abstract

The invention relates to a stator core with a winding for a medium-sized low-voltage variable-frequency motor, which comprises semi-formed windings, semi-open slot stator punched plates, a bottom pad, a slot insulation layer, a middle pad, a regulation pad, a slot wedge and a mounting slot, wherein the semi-formed windings are arranged at the two ends of the mounting slot; the slot insulation layer is arranged in the mounting slot; the bottom pad is placed on the bottom layer of the inner cavity of the slot insulation layer; a lower-layer stator coil formed by the semi-open slot stator punched plates is placed on the bottom pad; the middle pad is placed on the lower-layer stator coil; an upper-layer stator coil formed by the semi-open slot punched plates is placed on the middle pad; the regulation pad is placed on the upper-layer stator coil; the slot wedge is placed on the regulation pad; and the upper-layer and lower-layer coils are connected with the circuit of the semi-formed windings. The stator core improves the power factor and efficiency of the motor, reduces the capacity of the transducer, has high inter-turn insulation performance and improves the dv / dt value of the motor easily, thereby improving the reliability of the medium-sized variable-frequency motor.

Description

technical field [0001] The invention relates to a winding stator core of a medium-sized low-voltage high-power variable-frequency motor, in particular to a winding stator core of a low-voltage high-power variable-frequency motor with a center height of 315-710 mm. Background technique [0002] With the rapid development of the domestic electric power industry and the application of high-efficiency variable-frequency speed-regulating transmission systems more and more widely, it is more urgent to develop low-voltage high-power variable-frequency speed-regulating three-phase asynchronous motors. Generally, variable frequency motors are powered by transistor inverters. Transistor inverters use high-frequency pulses, and the pulse rise and fall time is very short. How to ensure that the winding insulation does not break down under the peak value of pulse voltage has become the key to the reliability of variable frequency motors. In recent years, domestic high-power frequency con...

AI Technical Summary

Problems solved by technology

In recent years, domestic high-power frequency conversion motors mostly adopt stacked or concentric windings with loose wires. Due to the high power of the motor, low voltage, large current, high inter-turn working voltage, and loose enamelled round copper wires, due to their Existing pinholes and defects caused by the manufacturing process (such as damage to the paint film during the manufacturing process of winding, off-line, etc., the quality of the dipping paint) and the first turn and the last turn of the coil scattered in the slot are easy to collide, and run for a period of time. Turn-to-turn short-circuit faults often occur after a period of time, which reduces the reliability of medium-sized low-voltage variable-frequency motors and shortens the life of medium-sized low-voltage variable-frequency motors

If open slots and formed windings are used, the power factor of the motor is not high, the iron loss is large, and the efficiency is low, which increases the capacity of the inverter

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