Variable-frequency and variable-speed motor

Abstract

The invention discloses a variable-frequency and variable-speed motor comprising a motor body, a heat radiator and a frequency converter electrically connected with the motor body, wherein the frequency converter comprises a master control board, a driving board and a power element which are electrically connected; the variable-frequency and variable-speed motor is an assembly of the frequency converter and the motor body; and the heat radiator is arranged on an end cap at the tail of the motor body and comprises a cap body and an containing part with an opening at one end, wherein the cap body is arranged at the opening of the containing part, a containing cavity is formed between the cap body and the containing part, heat radiating fins are formed at the outer periphery of the containing part, the inner side of the cap body is provided with the master control board of the frequency converter, the bottom at the inner side of the containing part is provided with the driving board of the frequency converter, insulating boards are all arranged between the master control board and the cap body and between the driving board and the containing part, and the inner side periphery of the containing part is provided with the power element of the frequency converter. The variable-frequency and variable-speed motor can realize the effects of reducing the on-site used space and prevent overshoot voltage generated by a power wire of the motor from destroying the insulation of the motor and effectively reduces the radiation of electromagnetic waves.

Description

technical field [0001] The invention relates to a motor, in particular to a variable-frequency variable-speed motor in which a frequency converter and a motor are integrated. Background technique [0002] In the field of industrial use, the voltage and frequency cannot be changed in the same proportion when the motor is started and stopped, so it is easy to cause saturation of the magnetic circuit, and in severe cases, the motor will be burned. Therefore, in actual use, it is necessary to connect the motor through a frequency converter to control the motor. , The frequency converter has superior functions in motor speed regulation and energy saving. At present, the installation distance between the inverter and the motor can be roughly divided into three situations: long distance (above 100 meters), medium distance (20-100 meters) and short distance (within 20 meters). The waveform is not a sine wave. The waveform contains a large number of harmonic components. The harmonic...

AI Technical Summary

Problems solved by technology

At present, the installation distance between the inverter and the motor can be roughly divided into three situations: long distance (above 100 meters), medium distance (20-100 meters) and short distance (within 20 meters). The waveform is not a sine wave. The waveform contains a large number of harmonic components. The harmonics of various frequencies will emit different degrees of electromagnetic radiation into the space, interfere with the communication environment, and may cause other equipment to malfunction. At the same time, there are certain risks to human health. hazard, so it is desirable to place the frequency converter near the controlled motor

However, due to the limitation of the production site space and the structural characteristics of the motor and the inverter itself, there is often a certain distance between the inverter and the motor. The inevitable existence of electromagnetic wave radiation

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