Three-phase asynchronous electric motor variable-frequency speed modulation device

Abstract

The invention discloses a three-phase asynchronous electric motor variable-frequency speed modulation device, which comprises a position limiting clamp groove, a variable frequency speed modulator, awood pin and a position limiting clamp block, wherein the variable frequency speed modulator consists of a host box and an overhaul door; the overhaul door is arranged at the back part of the host box; through the connection between the position limiting clamp groove and the position limiting clamp block, the variable frequency speed modulator can be fast installed into a connecting block arrangedon the top of a three-phase asynchronous electric motor; the fixation can be completed through the wood pin, so that the mounting and the dismounting of the variable-frequency speed modulator becomesimple and convenient; the whole structure is very simple; the production cost is very low; the production speed of enterprises is greatly improved; through the arrangement of the overhaul door, the overhaul door is used as a medium for connecting the three-phase asynchronous electric motor; the repair and replacement on the electric element inside the host box can be realized through host box turning under the condition of not taking down a speed modulator; the repair and the use of the whole equipment become convenient and fast.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a frequency conversion speed regulating device for a three-phase asynchronous motor. Background technique [0002] The frequency conversion speed controller is a device that converts the power frequency power (50Hz or 60Hz) into AC power of various frequencies to realize the variable speed operation of the motor. The control circuit completes the control of the main circuit, and the rectifier circuit converts the AC into DC. The DC intermediate circuit smoothes and filters the output of the rectifier circuit, and the inverter circuit inverts the DC power into AC power. In addition, it has an auxiliary function of changing the AC voltage. In the past, inverters were generally included in electrical equipment such as motor generators and rotary converters. With the advent of semiconductor electronics, it has become possible to produce completely independent frequency c...

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Problems solved by technology

[0003] There are the following problems in the frequency conversion speed control device of the prior art: 1. The frequency conversion speed control device is mostly fixed in the installation groove above the three-phase asynchronous motor by fastening screws, which makes the installation and disassembly of the frequency conversion speed control device inconvenient ; 2. The shell needs to be disassembled during maintenance of the frequency converter, which is inconvenient to operate and wastes time

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