SU139363A1 - Single Phase Vnp Induction Asynchronous Motor - Google Patents

Description

Known single-phase pole-pole asynchronous motors with pole-switched winding - having short-circuited coils at the poles.

In order to obtain start-up torque in such motors, at any number of pole pairs, it is proposed to place said turns only on a part of pole cores so that, for any number of pole pairs possible for a given engine, the short-circuit turn remains at the edge of the pole.

FIG. 1 (a and b), for example, shows the schemes for switching the number of pairs of poles of a four-pole electric motor with two short-circuited turns at the poles; in fig. 2 (a and b) - the same, six-pole electric motor with three short-circuited turns.

The motor shown in FIG. 1, has four clearly expressed poles with windings connected to the AC network. At the two poles / and 5, the starting short-circuited coils K are superimposed. When connecting the windings (the beginnings of which are indicated by letters and the ends - by the letters Ki - / (4) according to the scheme of Fig. 1a, the poles / and 5 have the same polarity, and the poles 2 to 4 - the other so that a four-pole motor (2p 4) is obtained. When switched on according to the scheme of Fig. 16, one polarity has poles / and .2 and the other pole has 3 4, so that a two-pole motor (2p 2) is obtained.

The four-pole switching on (2p 4) electric motor has a synchronous rotation speed of 3000 rpm, with a bipolar (2p 2) - 1500 rpm. The motor does not translate from one rotational speed to the second by simply switching the windings, in which the poles / and 2 receive reverse polarity.

No 139363-2 A similar picture takes place in a six-pole electric motor with six poles / -6, equipped with short-circuit starting coils L on three poles 2, 4 and 6. With the connection of the beginnings and ends Ki-KB of the AC windings shown in FIG. 2a, a six-pole motor (2p 6) is obtained, when connected as shown in FIG. 26 - quadruple (2p 4).

Positioning start short-circuited turns not at each pole so that each short-circuited turn when switching an electric motor to another speed of rotation is always located at the edge of the pole (in this case, by the term "the pole combines several poles having one polarity) and providing some the phase shift of the magnetic flux of this pole, which creates the starting torque of the rotor, can be performed by electric motors designed for different synchronous rotational speeds.

The described construction can also be applied to synchronous (hysteresis and reactive) motors.

Subject invention

1. Single-phase pole-pole asynchronous motor with a pole-switchable winding having short-circuited coils at the poles, characterized in that, in order to obtain a starting moment for any number of pole pairs, these coils are placed only on a part of the pole cores in such a way that at any possible for this motor number of pairs of poles, a closed loop remains at the edge of the pole.

2. Application of the design according to and. 1 to synchronous (hysteresis and reactive) motors.

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