CN2826807Y - Changing-pole starting non-slip-ring wound-rotor induction motor - Google Patents

Abstract

The utility model relates to a changing-pole starting non-slip-ring electric brush wound-rotor induction motor, which belongs to a motor field, aims to remove a slip-ring electric brush without stringing starting resistance, and has low starting current and high starting torque and high reliability and running efficiency at the same time. A stator winding of the utility model adopts 3Y/4Y parallel connection and adopts a change phase mode three phase changing-pole winding of 10/8 changing-pole ratio, wherein a 10 pole is used for starting, an 8 pole is used for normal running and a switching device is adopted to switch different pole numbers and complete the transduce of two work states. A rotor is provided with multi-phase symmetrical windings of two kinds of pole numbers, each phase winding is composed of a compound coil which is formed by that two sub-coils of different turn numbers are connected in parallel, the winding is arranged in the same rotor groove and is correspondingly used for the 10 pole for starting and the rotor shows high resistance. The winding is correspondingly used for the 8 pole for normal running, and the rotor shows low resistance. The mechanical structure of the rotor is simplified by the utility model, caused failure incipient faults are eliminated and running efficiency is improved.

Description

Pole-changing starting non-slip-ring wound-rotor induction electromotor

Technical field

The utility model belongs to electric motors, is specifically related to a kind of employing 10 utmost points starting, the non-slip-ring wound-rotor induction electromotor of 8 utmost points operation.

Background technology

Common Wound induction motor has the advantages that to seal in external resistor by slip-ring brush in rotor loop, thereby starting the time seals in suitable starting resistance in rotor loop, not only can reduce starting current but also improve starting torque, starting process finishes, the excision starting resistance, the high efficiency in the time of guaranteeing normally to move again.

But, owing to have slip-ring brush on the common Wound induction motor rotor, just exist easy out of order sliding contact like this in the rotor circuit, and owing to must seal in starting resistance starting smoothly, cause the rotor structure complexity, reliability is low, difficult in maintenance, starting finishes, and must excise starting resistance by threephase cable again, and the efficient in the time of can making actual motion so again reduces.

Summary of the invention

The utility model proposes a kind of pole-changing starting non-slip-ring wound-rotor induction electromotor, purpose is to remove and need not to seal in starting resistance in slip-ring brush, the motor rotor circuit, keep the same have low starting current and high starting torque, higher reliability and operational efficiency are arranged simultaneously with the Wound induction motor of being with slip-ring brush.

A kind of pole-changing starting non-slip-ring wound-rotor induction electromotor of the present utility model comprises stator, stator winding and rotor, rotor winding, it is characterized in that:

(1) described stator winding is that a cover adopts the 3Y/4Y parallel connection method, pole-changing is than the commutation method three-phase variable-pole winding that is 10/8, wherein one group of corresponding connection of winding is the 3Y parallel connection, present 10 utmost points, the corresponding connection of another group winding is the 4Y parallel connection, present 8 utmost points, adopt switching device to switch different numbers of poles and finish starting and two kinds of conversion of operation state of normal operation;

(2) be furnished with the heterogeneous symmetric winding of two kinds of numbers of poles on the described rotor, each phase winding is made of the compound coil of the different subcoil connect in parallel of two numbers of turn, is arranged in the same rotor, and corresponding to 10 utmost points, the rotor winding is a compound coil, presents high resistance; Corresponding to 8 utmost points, the rotor winding presents low resistance for being equivalent to 24 phases.

Described pole-changing starting non-slip-ring wound-rotor induction electromotor, it is further characterized in that:

(1) number of stator slots is 72, adopts three-phase 3Y/4Y commutation method in parallel, inserts three phase mains from one group of leading-out terminal, and the corresponding connection of winding is the 3Y parallel connection, presents 10 utmost points; Insert three phase mains from another group leading-out terminal, the corresponding connection of winding is the 4Y parallel connection, presents 8 utmost points;

(2) rotor slot for winding number is 96, and winding coil is for to constitute compound coil by two different subcoils of the number of turn, and for 8 utmost points, this winding is 24 phases, 15 ° of phase bandwidth, winding distribution ratio 1.0; For 10 utmost points, this winding each coil 1 phase, totally 96 phases.

The conversion of the utility model starting and running status is to be undertaken by the pole-changing switching of stator winding, so need not to install slip ring on the rotor, has both simplified the rotor mechanical structure, has also eliminated the potential faults that therefore brings, and has improved operational efficiency.But, because normal operation has been selected different numbers of poles for use with starting state, the synchronous speed difference of these two kinds of numbers of poles, so rotating speed can not arrive normal running speed during the utility model electric motor starting, still may there be impulse current in starting state when running status is changed.

Description of drawings

Fig. 1 is that the utility model stator 72 groove winding coils connect schematic diagram;

Fig. 2 is the utility model rotor 96 groove compound coil winding connection schematic diagrames.

Embodiment

As an embodiment, the utility model number of stator slots is 72, adopts three-phase 3Y/4Y commutation method in parallel, and the concrete connection of 10/8 utmost point winding coil as shown in Figure 1.Among Fig. 1, from leading-out terminal D ₄, D ₅, D ₆Insert three phase mains, the corresponding connection of winding is the 3Y parallel connection, presents 10 utmost points, is used for starting; From leading-out terminal D ₁, D ₂, D ₃Insert three phase mains, the corresponding connection of winding is the 4Y parallel connection, presents 8 utmost points, is used for normal operation.

For above-mentioned 10 utmost points and these two kinds of numbers of poles of 8 utmost points, the utility model rotor can present different resistance values respectively, realizes that the key of this point is to adopt the rotor winding of the mode of connection as shown in Figure 2.

Connection rotor winding shown in Figure 2, the groove number is 96, " compound coil " of coil for constituting by two different subcoils of the number of turn, as can be seen, for 8 utmost points of the normal operation utmost point, this winding is for being equivalent to 24 phases, 15 ° of phase bandwidth, winding distribution ratio 1.0, thereby performance index are suitable with arm's length standard 8 utmost point windings, can present low resistance to stator, at this moment high runnability will be arranged; For 10 utmost points during for starting, this winding is the compound coil characteristic, can present high electrical resistance to stator, thereby good starting characteristic can be arranged.

Among Fig. 2, the thick black line segment in figure both sides is represented the multiturn subcoil, and figure both sides fine rule segment table shows few circle subcoil.

Claims (2)

1. a pole-changing starting non-slip-ring brush wound-rotor induction motor comprises stator, stator winding and rotor, rotor winding, it is characterized in that:

(1) described stator winding is that a cover adopts the 3Y/4Y parallel connection method, pole-changing is than the commutation method three-phase variable-pole winding that is 10/8, wherein one group of corresponding connection of winding is the 3Y parallel connection, present 10 utmost points, the corresponding connection of another group winding is the 4Y parallel connection, present 8 utmost points, adopt switching device to switch different numbers of poles and finish starting and two kinds of conversion of operation state of normal operation;

(2) be furnished with the heterogeneous symmetric winding of two kinds of numbers of poles on the described rotor, each phase winding is made of the compound coil of the different subcoil connect in parallel of two numbers of turn, is arranged in the same rotor, and corresponding to 10 utmost points, the rotor winding is a compound coil, presents high resistance; Corresponding to 8 utmost points, the rotor winding presents low resistance for being equivalent to 24 phases.

2. pole-changing starting non-slip-ring wound-rotor induction electromotor as claimed in claim 1 is characterized in that:

(1) number of stator slots is 72, adopts three-phase 3Y/4Y commutation method in parallel, inserts three phase mains from one group of leading-out terminal, and the corresponding connection of winding is the 3Y parallel connection, presents 10 utmost points; Insert three phase mains from another group leading-out terminal, the corresponding connection of winding is the 4Y parallel connection, presents 8 utmost points;

(2) rotor slot for winding number is 96, and winding coil is for to constitute compound coil by two different subcoils of the number of turn, and for 8 utmost points, this winding is 24 phases, 15 ° of phase bandwidth, winding distribution ratio 1.0; For 10 utmost points, this winding each coil 1 phase, totally 96 phases.

Images