Multiwinding series connection variable volume induction motor and control device thereof

Abstract

The invention discloses a multiwinding series connection variable volume induction motor and a control device thereof. The multiwinding series connection variable volume induction motor is provided with a stator winding, wherein the stator winding is formed by compounding three sets of three-phase windings; the three sets of windings are correspondingly connected in series respectively; each phase of winding is provided with three line outlet ends; the three-phase windings are provided with nine line outlet ends in total and respectively correspond to a high-power grade, a medium-power grade and a low-power grade; each set of winding is distributed in a single layer; and three contactors of the control device are respectively connected with the line outlet ends of the three sets of windings so as to realize three-power three-grade switching. The three-phase windings adopt a Y connection method. The three sets of windings are in Y-delta mixed series connection; delta connection is adopted in a high-power volume connection method; a Y-delta mixed series connection method is used for medium-power volume; and a 2Y-delta mixed series connection method is used for low power. Compared with the prior art, the invention can be more favorably suitable for the condition of load change and has the advantages of large starting torque, high running efficiency and power factor, simplicity and convenience for control, high reliability, obvious reduction of no-load current and good energy saving effect.

Description

technical field [0001] The invention belongs to the technical field of motors, in particular to a multi-winding series variable capacity induction motor and an electrical control device thereof. Background technique [0002] At present, when the belt conveyors in the material loading of metallurgical mines in my country and the motors of pumping units in oil exploitation start or run, heavy loads and light loads or even no-load situations often appear alternately, and there is a serious problem of "big horses and small carts". "Phenomenon leads to low efficiency and serious energy consumption. In order to adapt to such a load, the motor is generally selected according to the heavy-load starting or running requirements, but this will cause the actual load rate of the motor to be small when the motor is light-loaded, and the efficiency and power factor will be low. In order to meet the requirement that the conveying motor can automatically match the load change and operate eff...

AI Technical Summary

Problems solved by technology

[0002] At present, when the belt conveyors in the material loading of metallurgical mines in my country and the motors of pumping units in oil exploitation start or run, heavy loads and light loads or even no-load situations often appear alternately, and there is a serious problem of "big horses and small carts". "Phenomenon leading to low efficiency and serious energy consumption

In order to adapt to such a load, the motor is generally selected according to the heavy-load starting or running requirements, but this will cause the actual load rate of the motor to be small when the motor is running under light load, and the efficiency and power factor will be low.

In order to meet the requirement that the conveying motor can automatically match the load change and operate efficiently, many schemes have been proposed at home and abroad, such as the use of high-slip motors, permanent magnet motors and double-stator motors, etc., but these schemes either have little improvement or cost Too high and complex control, etc., so it cannot meet the requirements of practical applications

Images