RU1816340C - Asynchronous gear motor - Google Patents

Abstract

The invention relates to low-power electric machines, and in particular to asynchronous motors with electromagnetic speed reduction. The aim of the invention is to increase the starting torque and expand the functionality by obtaining a low speed. An asynchronous gear motor contains a gear stator and a rotor, the tooth pitch of the stator is equal to the tooth pitch of the rotor, the stator has distinct poles, phase coils of the main and additional windings are located at the poles, the tooth comb of each phase is shifted relative to the other by 2/3 pole and 1 / 3 tooth divisions, the phases of the main winding are connected into a star, the coils of the additional winding at the opposite poles are connected in series and counterclockwise, and the phases of the additional winding are connected in a closed triangle, The sequence with the auxiliary winding phases switched capacitor. 2 il, Th1 fe

Description

The invention relates to low-power electric machines and can be used to create high-speed low-speed asynchronous electric drives-working mechanisms.

The aim of the invention is to increase the starting torque and expand the range of low engine speeds.

In FIG. 1 shows a wiring diagram of the phases of the auxiliary winding and the capacitor; in FIG. 2 - the nature of the mechanical characteristics of the engine,

The additional winding consists of three phases 1, 2, 3. connected in a triangle and short-circuited through a capacitor 4. The mechanical characteristic 5 has a resonant character compared to characteristic 6 of the motor without capacitor 4.

The capacitance of the capacitor 4 is selected from the condition of full compensation of the inductive resistance of the additional winding in the motor stop mode.

The operation of the electric motor is as follows.

When the main winding is connected to the network due to compensation, the starting current in the additional winding and the starting torque of the motor sharply increase. In this case, the mechanical characteristic of the engine has the form of curve 5 in FIG. 2, which is a pronounced resonance curve compared to the natural characteristic 6, when there is no capacitance in the auxiliary winding circuit (C °°). For such a mechanic00

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Characteristic 5 is characterized by low idle speed and high rigidity of curve 5 at its working section, similar to the rigidity of natural characteristic 6. This allows to obtain ultra-low creeping rotation speeds of the asynchronous motor gearbox, which are much lower than the synchronous motor speed equal to

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where zr is the number of teeth of the rotor, w is the angular frequency of the feed. Compared with the prototype, the electric motor according to the invention has a high starting torque and low (creeping) rotation speed, which was obtained without the help of Mechanical gear reducers and many times lower than the synchronous speed of the gear motor.

The use of the invention allows practically eliminating mechanical

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Claims (1)

gearboxes that reduce the speed of rotation in low-speed electric drives. SUMMARY OF THE INVENTION An asynchronous geared motor comprising a gear stator and a rotor, the stator is made with distinct poles, on which are located the phase coils of the main and additional windings, the stator and rotor teeth are made in the same pitch and the tooth comb of each phase is shifted 2/3 relative to the comb of the other phase pole and 1/3 tooth divisions, the phases of the main winding are connected in a star, the coils of the additional winding at opposite poles are connected in series and counterclockwise, and the phases of the additional the windings are connected in a closed triangle, characterized in that, in order to increase the starting torque and extend the range of low engine speeds, it is equipped with a capacitor connected in series to the closed triangle circuit of the additional stator winding.