CN2249988Y

CN2249988Y - Speed regulating A.C. cage motor

Info

Publication number: CN2249988Y
Application number: CN 95226923
Authority: CN
Inventors: 刘汉香; 严仰光
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-11-21
Filing date: 1995-11-21
Publication date: 1997-03-19
Anticipated expiration: 2005-11-21

Abstract

The utility model relates to a squirrel cage type AC speed regulating motor which is used for a stepless speed regulating system which has high reliability, and the utility model comprises a stator and a rotor. The utility model is characterized in that a stator armature winding is perpendicular to the axial direction and split into a main motor armature and a phase shift speed regulating armature, each lap winding of the phase shift speed regulating armature is electrically connected with an electric brush which is fixed on a speed regulation steering wheel by a commutator component, and the speed regulation steering wheel and the electric brush are in sliding connection with the commutator component. The utility model has the advantages of small starting current, high efficiency, low cost, convenient operation and high reliability of the speed regulating system, and the rotation speed can be regulated when the rotation speed is between zero and the rating rotation speed.

Description

The squirrel-cage ac adjustable speed motor

The utility model relates to a kind of motor of adjusting squirrel-cage AC induction motor output speed that can be used in, especially in the speed governing of high reliability request, speed adjusting performance is more superior, power controlling is very little application scenario.

At present, the squirrel-cage AC induction motor is as the executive component of governing system, main number of pole-pairs or two kinds of ways of change mains supply frequency of changing stator winding of relying on are regulated output speed, and changing the number of pole-pairs speed governing is step speed regulation, can not obtain level and smooth speed adjusting performance; The method that changes the mains frequency speed governing must be connected in series variable-frequency governor between asynchronous machine and electrical network, this will limit the reliability of whole system to a great extent to powerful device, makes the performance cost of whole system higher than very.

But the purpose of this utility model provides a kind of stepless speed regulation, and the reliability height, low price, easy to operate squirrel-cage ac adjustable speed motor.

The purpose of this utility model is to realize like this, according to two magnetic circuits space quadrature of the rotating magnetic field that produces of armature independently, be adjusted in the size of rotor loop internal induction electromotive force and torque that phase place is regulated rotor and the principle of rotating speed, the stator armature winding vertical axial of cage rotor asynchronous machine is divided into two, is divided into main armature and moving-phase speed control armature two parts; Each of moving-phase speed control armature winding that changes is electrically connected with brush on being fixed on the speed governing handwheel by commutator assembly, and speed governing handwheel and brush and commutator assembly are slidingly connected.

Above-mentioned moving-phase speed control armature is the 360/m degree facies tract winding that changes, and becomes positive m polygon to connect when the repeatedly winding of series connection makes the input of m cross streams electricity by commutator mutually, and m is the power supply number of phases.

The shared stator base of above-mentioned main armature and moving-phase speed control armature and a rotor, the moving-phase speed control armature can be fixed on arbitrary end of motor stator.

Adopt such scheme can make the utility model reach stepless speed regulation, with frequency control with series excitation speed governing to compare its advantage as follows: 1. starting current is little, and inner stray loss is little, the efficient height; 2. low price is easy to operate, and power controlling is little, governing system reliability height; 3. it is consistent that main motor and moving-phase speed control part line voltage not necessarily require, so this motor can be used for mesohigh, as the speed governing of 6 kilovolts of motors; 4. its speed-regulating range width can be 0～rated speed.

Fig. 1 is the structure principle chart that is designed to three phase times of the present utility model;

Fig. 2 is a single-phase equivalent circuit diagram of the present utility model;

Fig. 3 is the right view of Fig. 1.

The utility model is described in further detail below in conjunction with accompanying drawing:

The utility model comprises motor stator and rotor 4, motor stator armature winding vertical axial is divided into two, be divided into main armature 5 and moving-phase speed control armature 6 two parts, main armature 5 and moving-phase speed control armature 6 a shared stator base and rotors 4, moving-phase speed control armature 6 can be fixed on arbitrary end of stator, and moving-phase speed control armature 6 is fixed on stator by fan one end among Fig. 1; Moving-phase speed control armature 6 elements of winding are by commutator assembly 1 mutual coupled in series, the commutator segment number equals repeatedly element of winding number of armature 6, each of moving-phase speed control armature 6 winding that changes is electrically connected with brush 7 on being fixed on speed governing handwheel 2 by commutator assembly 1, and speed governing handwheel 2 and brush 7 are slidingly connected with commutator assembly 1; Moving-phase speed control armature 6 is the 360/m degree facies tract winding that changes, m is meant the power supply number of phases, become positive m polygon to connect when the repeatedly winding of series connection makes the input of m cross streams electricity by commutator assembly 1 mutually, provided the structural representation of a pair of utmost point motor of m=3 among Fig. 3, be that three-phase squirrel cage buncher facies tract winding becomes 120 degree equilateral triangles to electrically connect, rotate speed governing handwheel 2, the electrical degree of brush 7 relative commutator assembly 1 sliding spaces on it, just changed the space starting phase angle of the rotating magnetic field of this moving-phase speed control armature generation, that is two armature 5, the space quadrature of 6 rotating magnetic fields that produce, make the rotating speed of adjusting machine shaft 3 in rotor 4 loop internal induction electromotive force sizes, the size of rotor 4 loop internal induction electromotive forces and phase place change with the phase shifting angle size; Main armature 5 length l ₁〉=moving-phase speed control armature 6 length l ₂, the ratio of the selection of two armature lengths and air-gap flux size is decided by speed adjustable range, and when two armatures, 5,6 air-gap fluxs and armature length equated, speed adjustable range was that zero rotating speed is to rated speed; The design consideration power of motor of armature winding 5 and the winding configuration of employing carry out.

Fig. 2 is the single-phase equivalent circuit diagram of the related squirrel-cage ac adjustable speed motor of the utility model, among Fig. 2: U ₁, U ₂Be respectively main motor and claim the phase voltage of speed governing armature mutually, since the effect of phase shift, U ₁, U ₂Phase difference θ angle is arranged, y ₁₁, x ₆₁₁, y ₁₂, x ₆₁₂Be respectively stator limit two parts copper loss resistance and leakage inductance separately, y _M1, y _M1, y _M2, x _M2Be the corresponding separately excitatory impedance of portions of resistance, y ₂/ s, x ₆₂Convert the power component and the leakage inductance of the correspondence on stator limit for cage rotor, E ₁, E ₂Be two parts induced potential on sliver, i ₂Be the rotor current reduced value, can easily derive m phase, p relation, therefrom, can very clearly obtain Tdc and U electromagnetic torque Tdc and the revolutional slip s and the phase shifting angle θ of utmost point squirrel-cage ac adjustable speed motor from this equivalence circuit diagram ₁, U ₂And the composite type [(U of θ ₁, U ₂CoS θ) ²+ (U ₂Sin θ) ²] be directly proportional.

Claims

1, a kind of squirrel-cage ac adjustable speed motor that is used for the high reliability continuous speed regulation system comprises stator, rotor (4), it is characterized in that stator armature winding vertical axial is divided into main armature (5) and moving-phase speed control armature (6); Each of moving-phase speed control armature (6) winding that changes is electrically connected with brush (7) on being fixed on speed governing handwheel (2) by commutator assembly (1), and speed governing handwheel (2) and brush (7) are slidingly connected with commutator assembly (1).

2, squirrel-cage ac adjustable speed motor as claimed in claim 1, it is characterized in that said moving-phase speed control armature (6) is the 360/m degree facies tract winding that changes, m is the power supply number of phases, becomes positive m polygon to connect when the repeatedly winding of series connection makes the input of m cross streams electricity by commutator assembly (1) mutually.

3, squirrel-cage ac adjustable speed motor as claimed in claim 1, its special sheet are a shared stator base of said main armature (5) and moving-phase speed control armature (6) and a rotor (4), and moving-phase speed control armature (6) can be fixed on arbitrary end of motor stator.