SU1617533A1 - Single-phase induction motor - Google Patents

Abstract

The invention relates to electrical engineering and can be used in pole-mounted asynchronous motors with shielded poles. The aim of the invention is to increase the energy performance. The motor contains a stator 1 with reversed poles 2, a coil excitation winding 3, bearing shields 4, short-circuited shielding coils with active parts 5 placed in the grooves of 6 pole pieces. Bearing shields are made of electrically conductive material and bonded to the ends of the active parts of the shielding turns. Thus, bearing shields are used as frontal parts of the cs. turns, and the active parts of the short circuit turns tightly into the grooves of pole pieces serve to fix the bearing shields relative to the stator. 3 il.

Description

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The invention relates to the field of electrical engineering and can be used in single-phase electric motors with newly expressed poles.

The aim of the invention is to increase the energy performance.

FIG. 1 shows a single-phase two-pole motor; in fig. 2 - four-pole motor; in fig. 3 bipolar motor with remote excitation winding.

The motor contains a stator 1 with clearly defined poles 2. The coil winding 3 of the excitation, two bearing shields 4 located at the ends of the stator, the active parts of the short-circuited shielding coils 5, are placed along the tight fit in the slots 6 of the pole pieces. The grooves 6 are made according to the number of poles with a symmetric shift relative to the axis of the opposite poles at an angle a. The ends of the active parts of the shielding coils 5 are electrically and mechanically connected by welding to the bearing shields. This ensures the fixing of the bearing shields and, therefore, the rotor relative to the stator.

The engine works as follows.

When voltage is applied to the excitation coil winding 3, an alternating current flows through it, creating a magnetic flux pulsing along the axis of the poles. A part of this flow interlocks with the shielding coils, coils formed by the active parts of the conductors and the electrically conductive bearing shields attached to them. The degree of shielding of the main stream is determined by the coal

shielding, which is selected within 0 and 90 (el.grad.).

Due to the spatial and temporal shift of shielded and unshielded fluxes, a rotating magnetic field is created in the working gap necessary for the creation of an electromagnetic moment.

The engine has a simpler design compared to the prototype due to the fact that the bearing shields perform the function of the front parts of the short circuit. shielding coils, and the active parts of the short circuit. turns act as studs, fixing the bearing shields relative to the stator. In this case, the energy performance also improves, since the increased cross-section of the bearing shields is compared with the cross-section of the active parts. turns reduces losses in the course of currents in shielding turns. In addition, the absence of holes in the magnetic core under the sleeve increases the magnetic conductivity of the magnetic circuit, reduces the magnetizing current and increases the efficiency and power factor of the engine.

Claims (1)

Invention Formula A single-phase asynchronous motor containing a stator with newly expressed poles, bearing shields made of electrically conductive material and short-circuited shielding coils with active parts placed in grooves symmetrically shifted relative to the axis of the poles, characterized in that the number of active parts of short-circuited turns equal to the number of poles, and their ends are electrically and mechanically connected to the bearing shields, mainly by welding. 5 6 FIG. 2 -J