SU828327A1 - Single-phase induction electric motor - Google Patents

Description

The invention relates to single-phase asynchronous motors of low power and can be used in various areas of the national economy.

Single-phase asynchronous electric motors are known, comprising a stator with teeth differing in height 1.

A disadvantage of such electric motors is the complexity of the switching circuit, determined by the need for a phase-shifting element.

The closest in technical essence and the achieved result to the proposed electric motor is a single-phase electric motor containing a stator with a collar and a tooth zone, with the height of the river I vary along the tooth zone. A bipolar winding 2 is installed on the stator.

The disadvantage of this device is a low value (efficiency.

The purpose of the invention is to increase the efficiency of an electric motor, as well as its starting characteristics.

This is achieved by the fact that the tooth zone is made distributed, the height of the frame is determined by the expression

a-b

H Dl / a sin-o -f b-cos-c

a

and - - -,, and the axis of symmetry of the tooth b-

CWD zone of the magnetic circuit is offset relative to the axis of the poles of the winding at an angle of 20-45 e. hail, where H is the height of the stator rotor, D is the diameter of the outer circumference of the stator, and is the distance between the center of the stator and the bottom of the groove bold with the stator's minimum height, b is the distance between the center of the stator and the bottom of the groove, the maximum height adjacent to the stator rom, φ is the angular location of the slots along the stator bore, h is the maximum height of the stator ма s, and is a constant value determined by the range 0.25-0.55. The drawing shows schematically

cross section of an electric motor having one pair of poles.

This electric motor contains a rotor with a short-circuited winding 1, a stator 2 with a tooth-like zone and a pole having

maximum height / g „max minimum height / g„ „„ n winding 3, which has an axis of 4 poles and is wound on the dentate zone, the base of the teeth of which are located on an ellipse having a major axis 5 and

minor axis 6.

At the nominal value “a” of the stator winding 3, the magnitude of induction in the part of the rom with a smaller cross section (/ 1 „„ |,) corresponds to a saturated part of the magnetization curve, and the value of induction in the part of the rom with a larger section (/ g „ax) corresponds to the unsaturated part of the curve magnetization. Due to the fact that the angles between the magnetomotive force vector and the vectors of the bitwise stresses created by the stator winding 3, the currents closing with parts of the rm with | different sections are different in the temporary phases of the change in the lamination of the steel of the rm. The angles between the vectors and the magnetic fluxes in space are due to the constructive angle a of the stator. The interaction of magnetic fluxes with different temporal and spatial phases causes a hellinic rotating field, in the micromotor air gap, which creates a torque.

Vypolienia distributed tooth zone And rm with a variable height allows to increase the energy performance and improve the starting properties of the electric motor.

Claims (2)

1. US Patent No. 3942055, cl. 310-216, 1976. 2. USSR author's certificate No. 158336, cl. H 02 K 17/04, 1961. llHVH flfi-JKG NAC h / itjH