CN203734489U - Three-phase asynchronous motor - Google Patents

Abstract

The utility model discloses a three-phase asynchronous motor comprising three phase windings: an A phase winding, a B phase winding and a C phase winding. The A phase winding comprises an A1 coil, an A2 coil and an A3 coil. The B phase winding comprises a B1 coil, a B2 coil and a B3 coil. The C phase winding comprises a C1 coil, a C2 coil and a C3 coil. One end of each coil capable of connecting with a power supply directly is the head end of the coil, and the end opposite to the head end is the tail end of the coil. According to the three-phase asynchronous motor, the starting torque is large, so that the motor can be in heavy load starting; and meanwhile, the motor is simple in structure.

Description

Threephase asynchronous machine

Technical field

The utility model relates to a kind of motor, particularly relates to a kind of threephase asynchronous machine.

Background technology

Threephase asynchronous machine is the important component part in industrial motive use, the rotor speed of threephase asynchronous machine is lower than the rotating speed of rotating magnetic field, rotor winding because of and magnetic field between exist relative motion induced electromotive force and electric current, and with magnetic field interaction produce electromagnetic torque, realize energy conversion.Always with simple in structure, reliable, lightweight, low price and applied on a large scale.

It is star-triangle start mode or coil sections Starting mode that current middle-size and small-size threephase asynchronous machine adopted more; So these two kinds of Starting mode can only be applied to the start operating performance of zero load or relative underloading because detent torque is relatively little.

For the field that need to start with heavy duty at some, star-triangle start mode and coil sections Starting mode obviously can not meet the demands because its detent torque is relatively little.

At present for the field that needs heavy load starting, generally take the mode of variable frequency starting or with auxiliary actuating apparatus, this has increased equipment investment and maintenance cost undoubtedly.

Utility model content

The purpose of this utility model is to provide a kind of threephase asynchronous machine, and its detent torque is large, and starting current is less.

For solving the problems of the technologies described above, threephase asynchronous machine of the present utility model, comprises A phase winding, B phase winding and C phase winding totally three phase windings, and described A phase winding comprises A1 coil, A2 coil and A3 coil; Described B phase winding comprises B1 coil, B2 coil and B3 coil; Described C phase winding comprises C1 coil, C2 coil and C3 coil; One end that each coil can directly be connected with power supply is its head end, and one end relative with head end is its tail end;

Described A1 coil is connected with the head end of A2 coil, and B1 coil is connected with the head end of B2 coil, and C1 coil is connected with the head end of C2 coil;

Described A1 coil, C1 coil and the tail end of B3 coil are connected; Described A2 coil, C3 coil and the tail end of B1 coil are connected, and described A3 coil, C2 coil and the tail end of B2 coil are connected.

Further, also comprise the diverter switch that can make the head end of the each coil in each phase winding simultaneously connect.In the time of electric motor starting, the head end of A1 coil, B1 coil and C1 coil access three phase mains, now the starting current of motor is 0.6 times while directly starting, detent torque is 0.5 times while directly starting; When starting current can be reduced, can keep enough large detent torque.

Adopt technique scheme, the beneficial effects of the utility model are: threephase asynchronous machine of the present utility model, and detent torque is large, can heavy load starting, simultaneously simple in structure.

Brief description of the drawings

Fig. 1 is the schematic diagram that ordinary three-phase synchronous star of the prior art-triangle starts;

Schematic diagram when Fig. 2 is ordinary three-phase synchronous operation of the prior art;

Schematic diagram when Fig. 3 is ordinary three-phase synchronous coil sections startup of the prior art;

Fig. 4 is the schematic diagram in the time of operation after ordinary three-phase synchronous coil sections of the prior art starts;

Schematic diagram when Fig. 5 is threephase asynchronous machine startup of the present utility model;

Fig. 6 is the schematic diagram of threephase asynchronous machine of the present utility model while normally moving.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.

As shown in Figures 1 and 2, ordinary three-phase synchronous in the prior art startup stage and schematic diagram while normally moving, when adopt shown in Fig. 1 star-triangle start mode time, the size of current flowing through in A phase winding, B phase winding and C phase winding only has 0.3 times of the normal operating conditions shown in Fig. 2, at this moment, ordinary three-phase synchronous can not heavy load starting, can only drive lighter load, has limited its service condition.

As shown in Figures 3 and 4, when ordinary three-phase synchronous of the prior art adopts coil sections mode to start, every phase winding only has coil sections energising, and the size of current of now passing through in every phase winding also only has 0.3 times under normal operating conditions, can not heavy load starting.

Above prior art all can not realize heavy load starting, need to increase extra frequency conversion equipment, has increased cost.

In the disclosed threephase asynchronous machine of the present embodiment, every phase winding is provided with three coils.As shown in Figures 5 and 6, it comprises A phase winding, B phase winding and C phase winding totally three phase windings, and described A phase winding comprises A1 coil, A2 coil and A3 coil; Described B phase winding comprises B1 coil, B2 coil and B3 coil; Described C phase winding comprises C1 coil, C2 coil and C3 coil; One end that each coil can directly be connected with power supply is its head end, and one end relative with head end is its tail end;

Described A1 coil is connected with the head end of A2 coil, and B1 coil is connected with the head end of B2 coil, and C1 coil is connected with the head end of C2 coil;

Described A1 coil, C1 coil and the tail end of B3 coil are connected; Described A2 coil, C3 coil and the tail end of B1 coil are connected, and described A3 coil, C2 coil and the tail end of B2 coil are connected;

The head end of A1 coil and A2 coil is connected with terminal 1, and the head end of A3 coil is connected with terminal 7;

The head end of B1 coil and B2 coil is connected with terminal 3, and the head end of B3 coil is connected with terminal 9;

The head end of C1 coil and C2 coil is connected with terminal 2, and the head end of C3 coil is connected with terminal 8.

It also comprises the diverter switch that can make the head end of the each coil in each phase winding simultaneously connect.

This threephase asynchronous machine in the time of wiring, by three phase mains and terminal 1,2,3, be connected, if starter motor now, when the electric current in every phase winding only has direct startup 0.6 times, detent torque is 0.5 times while directly starting.After startup, diverter switch action, makes terminal 7 be connected with terminal 1, and terminal 2 is connected with terminal 8, and terminal 3 is connected with terminal 9.Now motor will be in normal operating conditions.

The above embodiment has only expressed execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.

Claims (2)

1. a threephase asynchronous machine, comprises A phase winding, B phase winding and C phase winding totally three phase windings, it is characterized in that: described A phase winding comprises A1 coil, A2 coil and A3 coil; Described B phase winding comprises B1 coil, B2 coil and B3 coil; Described C phase winding comprises C1 coil, C2 coil and C3 coil; One end that each coil can directly be connected with power supply is its head end, and one end relative with head end is its tail end;

Described A1 coil is connected with the head end of A2 coil, and B1 coil is connected with the head end of B2 coil, and C1 coil is connected with the head end of C2 coil;

Described A1 coil, C1 coil and the tail end of B3 coil are connected; Described A2 coil, C3 coil and the tail end of B1 coil are connected, and described A3 coil, C2 coil and the tail end of B2 coil are connected.

2. threephase asynchronous machine according to claim 1, is characterized in that: also comprise the diverter switch that can make the head end of the each coil in each phase winding simultaneously connect.