CN203827119U - Squirrel-cage type motor with adjustable air gap between stator and rotor - Google Patents

Abstract

The utility model relates to a squirrel-cage type motor, and discloses a squirrel-cage type motor with adjustable air gap between stator and rotor. The structure of the squirrel-cage type motor is characterized in that a shaft (1) is arranged on a centerline of an outer shell (9); the left side of the shaft (1) is provided with a supporting rod (8) vertical to the centerline, upper and lower sections of the supporting rod (8) are respectively sleeved with a spring (6) and a counter weight (3), one end of the spring (6) is fixed on the shaft (1), and the other end is connected with the counter weight (3); the right side of the shaft (1) is connected with a rotor (5) through a key (7), the outer ring of the rotor (5) is coated with a stator (4), and an air gap (Q) is reserved between the rotor (5) and the stator (4); and the counter weight (3) is connected with the rotor (5) through a connecting rod (2). The squirrel-cage type motor can adjust the size of the air gaps between the stators and the rotor in real time through an air gap adjusting mechanism according to the difference of the rotating speed of the rotor, thereby improving the performance of the motor; the squirrel-cage type motor has the advantages of simple structure and easy implementation; and the squirrel-cage type motor with the adjustable air gaps between stators and rotor is suitable for various kinds of motors.

Description

The adjustable squirrel cage motor of a kind of rotor air gap

Technical field

The utility model relates to a kind of squirrel cage motor, relates in particular to the adjustable squirrel cage motor of a kind of rotor air gap.

Background technology

Air gap refers to the air gap existing between motor stator and rotor, the efficiency of cutting magnetic induction line when the size of air gap value can affect electric motor starting moment of torsion and operation.Air gap is excessive, and [in alternating current circuit, the cosine of the phase difference (Φ) between voltage and electric current is called power factor will to cause motor power factor, represent with symbol cos Φ, numerically, power factor is the ratio of active power and apparent power, i.e. cos Φ=P/S.] decline; The too little performance of ventilating that makes motor of air gap declines, thereby affects the heat radiation of motor, makes electric machine temperature rise aggravation.But the air gap value between the rotor of conventional motors is fixed at present.The paradox existing based on above size of gaps, in the urgent need to inventing a kind of air gap adjustable motor, makes motor can regulate within the specific limits the size of air gap, thereby in a kind of more operating state of coupling.

Summary of the invention

The purpose of this utility model is just to overcome the fixing problem of air gap between current mouse cage type motor stator and rotor, provides a kind of rotor air gap adjustable squirrel cage motor.

The purpose of this utility model is achieved in that

On the basis of conventional motors, additional a kind of air gap governor motion can move left and right by air gap governor motion rotor on axle.Two ends of rotor external diameter is variant, thereby has the profile of round platform; Stator two ends internal diameter is variant, thereby also has the inner surface of round platform.The common inter-air space that forms between the surface of two circular platform types, in the time that rotor moves left and right, air gap distance will have corresponding change.

Specifically, this motor comprises axle, connecting rod, weight, stator, rotor, spring, key, support bar and shell;

Its position and annexation are:

On outer casing centerline, be provided with axle;

Be provided with the support bar vertical with center line on the left side of axle, be inserted in respectively spring and weight at support bar two sections, spring one end is fixed on axle, and the other end connects weight;

The right at axle is connected with rotor by key, is enclosed with stator in the outer ring of rotor, between rotor and stator, leaves air gap;

Weight is connected with rotor by connecting rod.

The utlity model has following advantages and good effect:

1. can regulate in real time the size of gaps between stator and rotor by air gap governor motion according to the difference of rotor speed, thereby improve the performance of motor;

2. simple in structure, implement easily;

3. be applicable to various types of motors.

Brief description of the drawings

Fig. 1 .1 is structural representation of the present utility model;

Fig. 1 .2 is structural representation of the present utility model (when air-gap separation becomes large);

Fig. 1 .3 is structural representation of the present utility model (when air-gap separation diminishes).

In figure:

1-axle, 2-connecting rod, 3-weight, 4-stator,

5-rotor, 6-spring, 7-key, 8-support bar,

9-shell, Q-air-gap separation.

Fig. 2 is wind energy conversion system power output under the different air gap spacing curve chart with rotation speed change;

Fig. 3 is the optimum performance match curve figure between wind energy conversion system air-gap separation and wind speed.

Embodiment

Describe in detail below in conjunction with drawings and Examples:

One, the structure of motor

1, overall

As Fig. 1 .1,1.2,1.3,2,3, this motor comprises axle 1, connecting rod 2, weight 3, stator 4, rotor 5, spring 6, key 7, support bar 8 and shell 9;

Its position and annexation are:

On shell 9 center lines, be provided with axle 1;

Be provided with the support bar vertical with center line 8 on the left side of axle 1, be inserted in respectively spring 6 and weight 3 at support bar 8 two sections, spring 6 one end are fixed on axle 1, and the other end connects weight 3;

The right at axle 1 is connected with rotor 5 by key 7, is enclosed with stator 4 in the outer ring of rotor 5, between rotor 5 and stator 4, leaves air gap Q;

Weight 3 is connected with rotor 5 by connecting rod 2.

2, functional part

Following each functional part, except stator 4 and rotor 5, is universal metal part.

1) axle 1

Axle 1 is a kind of major axis, plays rotation and supporting role.

2) connecting rod 2

Connecting rod 2 connects weight 3 and rotor 5.

3) weight 3

Weight 3 is a kind of cylinders with certain mass.

4) stator 4

The inner surface of stator 4 is round table-like.

5) rotor 5

The outer surface of rotor 5 is round table-like, and with stator 4 inner surface adaptations.

6) spring 6

Spring 6 is helical spring, connecting axle 1 and weight 3, and provide spring force to weight 3.

7) key 7

Key 7 locating shafts 1 and rotor 5.

8) support bar 8

Support bar 8 plays support spring 6 and weight 3.

9) shell 9

Shell 9 plays the each functional part of sealing.

3, working mechanism

This motor is attached with air gap governor motion, adopts centrifugally regulated principle.In the time that rotor 5 rotates, produce centrifugal force with rotor 5 with the weight 3 of rotating speed, under certain rotating speed, the centrifugal force of weight 3 will balance each other with the pulling force of the spring 6 of certain elongation.In the time that rotor 5 rotating speeds change, the centrifugal force of weight 3 will change spring 6 is elongated or shortened, thereby move left and right along major axes orientation by connecting rod 2 rotor drivens 5, reach the object that changes the air gap Q size between stator 4 and rotor 5.

Two, test situation

Certain wind energy conversion system model, its design generator power is 1000W, design air-gap separation is 1.12mm, the impact bringing to wind energy conversion system startup rotating speed and power output for the air-gap separation of examination stator and rotor, in the time that air-gap separation is 0.62mm, 1.12mm and 1.62mm, the model power output under different rotating speeds condition is carried out to experimental measurement respectively, obtained the curve of the wind energy conversion system power output under different air gap spacing as shown in Figure 2 with rotation speed change.

As shown in Figure 2:

1. in the time that this wind energy conversion system air-gap separation is increased to 1.62mm from design load 1.12mm, starts rotating speed and be increased to about 114n/min from about 108n/min; Be that air-gap separation increase makes to start rotating speed rising.

2. in the time that this wind energy conversion system air-gap separation is decreased to 0.62mm from design load 1.12mm, wind energy conversion system power output under the rotating speed of 200n/min left and right is increased to about 1W from about 0.5W, wind energy conversion system power output under the rotating speed of 180n/min left and right is increased to about 0.4W from about 0.2W, and the wind energy conversion system power output under the rotating speed of 110n/min left and right is increased to about 0.004W from about 0.0025W; Be that air-gap separation reduces to make power output to raise.

3. estimate thus, under high wind speed, improve power output approximately 30%, under middle wind speed, improve power output approximately 20%.

Fig. 3 has provided the optimum performance match curve between this wind energy conversion system air-gap separation and wind speed.

Claims (2)

1. the adjustable squirrel cage motor of rotor air gap, is characterized in that:

Comprise axle (1), connecting rod (2), weight (3), stator (4), rotor (5), spring (6), key (7), support bar (8) and shell (9);

Its position and annexation are:

On shell (9) center line, be provided with axle (1);

Be provided with the support bar vertical with center line (8) on the left side of axle (1), be inserted in respectively spring (6) and weight (3) at support bar (8) two sections, it is upper that spring (6) one end is fixed on axle (1), and the other end connects weight (3);

The right at axle (1) is connected with rotor (5) by key (7), is enclosed with stator (4) in the outer ring of rotor (5), between rotor (5) and stator (4), leaves air gap (Q);

Weight (3) is connected with rotor (5) by connecting rod (2).

2. by the adjustable squirrel cage motor of a kind of rotor air gap claimed in claim 1, it is characterized in that:

The inner surface of described stator (4) is round table-like; The outer surface of described rotor (5) is round table-like, and with stator (4) inner surface adaptation.