JPH09271159A - Stator structure of induction motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide stator structure of an induction motor capable of easily changing the number of poles and a connection method while being able to miniaturize the motor. SOLUTION: Conductive rods 60 are inserted into each slot of a stator body 35, connecting blocks 64 are fitted detachably at the end sections of these conductive rods 60, the conductive wires 62 of the mutually corresponding conductive rods 60 are connected electrically through the connecting blocks 64 while power input blocks are fitted detachably at the end sections of the conductive rods 60, and the conductive wires of the conductive rods 60 are joined electrically at the power terminals of the power input blocks.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a stator portion for generating a rotating magnetic field in an induction motor.

[0002]

2. Description of the Related Art The structure of a conventional induction motor is shown in FIG. A stator 1 composed of a laminated body of a large number of ring-shaped members is housed in a cylindrical frame 2, and a rotor 3 is inserted inside the stator 1. End brackets 7 and 8 for pivotally supporting a rotary shaft 6 of the rotor 3 are fixed to both ends of the stator 1 via bearings 4 and 5, respectively, by bolts 9.

As shown in FIGS. 11 and 12, a plurality of slots 10 to 33 are formed in the inner peripheral portion of the stator 1 along the length direction of the stator 1, and each of these slots has a plurality of slots. The stator winding 34 is wound to form a stator coil. Only the stator windings 34 that connect the slots 10 and 22 are shown, and the stator windings that connect the other slots are not shown. This stator coil has slots 10 to 10.
It has the connection shown in FIG. 13 which is determined by how the stator winding 34 is wound around 33 and produces a rotating magnetic field for rotating the rotor 3. That is, in the example of FIGS. 12 and 13, slots 10 to 22 and slots 11 to 2
3, the stator windings 34 are routed in every other slots 10 to 33 every other interval, but it may be configured to route the stator windings 34 every two or three intervals. For example, motors having different numbers of poles are formed.

[0004]

However, no matter what winding method is used, the stator winding 34 is once attached to the stator 1.
When the coil is wound, the winding method cannot be changed. Therefore, the number of poles of the motor and the wiring method cannot be changed in conformity with the purpose of use and peripheral circuits. Also,
At both ends of the stator 1, the stator windings 34 routed from one slot to the other are bulky,
The motor had to be upsized. The present invention has been made to solve such a problem, and provides a stator structure for an induction motor in which the number of poles and the wiring method can be easily changed and the motor can be downsized. With the goal.

[0005]

A stator structure for an induction motor according to the present invention includes a stator body having a substantially cylindrical shape and a plurality of slots formed on an inner peripheral surface along a length direction of the cylinder. , A plurality of current-carrying rods each of which is detachably inserted into each slot of the stator main body and contains a conductor extending from one end to the other end of each slot,
At the end of the stator body, a connection block that is detachably fitted to the ends of at least two current-carrying rods at the end of the stator body and electrically connects the conductors of these current-carrying rods to each other And an electric power input block having a power supply terminal that is detachably fitted to the end of the energizing rod and that is electrically connected to the conductor of the energizing rod.

As each of the current-carrying rods, it is possible to use a rod body made of an insulator in which a plurality of conductive wires to be conductors are embedded while being electrically insulated from each other. In this case, the connection block and the power input block may be provided with a plurality of connection pins respectively connected to the plurality of conductive wires of the energizing rod.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a stator body 35 used in a stator structure of an induction motor according to an embodiment of the present invention. The stator main body 35 has a substantially cylindrical shape including a laminated body of a large number of ring-shaped members,
On the inner peripheral surface thereof, a plurality of slots 36 to 59 are formed at equal intervals along the length direction of the stator body 35.

FIG. 2 is an enlarged view of the energizing rod 60 inserted into each slot of the stator body 35. The current-carrying rod 60 has a rod body 61 made of an insulator, and a plurality of conductive wires 62 are embedded in the rod body 61. The rod main body 61 has the same length as the stator main body 35, and a concave surface 63 having the same curvature as the inner peripheral surface of the stator main body 35 is formed on the outer peripheral portion along the length direction. The plurality of conductive wires 62 are embedded in the length direction of the rod body 61 while being separated from each other, and are electrically insulated from each other by an insulator forming the rod body 61. Both ends of each conductive wire 62 are processed into a tubular shape and exposed on the end surface of the rod body 61, respectively.

The energizing rod 60 is detachably inserted into each of the slots 36 to 59 of the stator body 35. Since the rod main body 61 has a concave surface 63 having the same curvature as the inner peripheral surface of the stator main body 35 on the outer peripheral portion, the energizing rod 60 is provided in each of the slots 36 to 59 of the stator main body 35.
Is inserted, the stator body 35 is formed with a continuous inner peripheral surface as shown in FIG.

The connection block 64 shown in FIG. 4 and the power input block 65 shown in FIG. 5 are detachably fitted to the ends of the current-carrying rod 60 inserted into the slots 36 to 59 in this manner. The connection block 64 has a configuration in which a plurality of connection pins 67 are provided at both ends of an arc-shaped block body 66, respectively. The connection pins 67 provided at each end of the block body 66 respectively correspond to the plurality of conductive wires 62 of the current-carrying rod 60 shown in FIG. 2, and are arranged in the same number and in the same pattern as these conductive wires 62. . Connection pin 67 provided at one end of the block body 66
The connection pins 67 provided at the other end are electrically connected to each other through corresponding connection pins 67 connected to each other via connection lines embedded in the block body 66.

On the other hand, like the connection block 64, the power input block 65 also has a structure in which a plurality of connection pins 69 are provided at both ends of an arc-shaped block body 68, respectively. The connection pins 69 provided at each end of the block body 68 respectively correspond to the plurality of conductive wires 62 of the current-carrying rod 60 shown in FIG. 2, and are arranged in the same number and in the same pattern as these conductive wires 62. . Block body 68
Of the connection pin 69 provided at one end of the connection pin 69 and the connection pin 69 provided at the other end of the connection pin 69 are electrically connected to each other through a connection wire embedded in the block body 68. There is. A power supply terminal 70 electrically connected to the connection pin 69 is provided on the back surface of one end of the block body 68.
Is protruding.

The block body 66 of the connection block 64 and the block body 68 of the power input block 65 are each made of a flexible material such as resin. Further, each of the connection pins 67 and 69 has such a thickness that it can be fitted into the tubular end portion of the conductive wire 62.

The connection block 64 and the power input block 65 are connected to the slots 36 to 59 of the stator body 35.
It is fitted to one end of the current-carrying rod 60 inserted therein. For example, as shown in FIG. 6, the connection pins 67 at both ends of the connection block 64 are fitted into the conductive wires 62 of the energizing rod 60 inserted into the slots 37 and 48, respectively. As a result, the conductive wire 62 of the current-carrying rod 60 inserted in the slot 37 and the current-carrying rod 60 inserted in the slot 48.
And the conductive wire 62 of are electrically connected to each other via a connection block 64.

Similarly, as shown in FIG. 7, connection blocks 64 are mounted between the slots 38 and 49 and between the slots 39 and 50, respectively. A power input block 65 is mounted between the slots 40 and 51. In this way, the connection blocks 64 are mounted between the slots 41 to 43 and the slots 52 to 54, and between the slots 45 to 47 and the slots 56 to 58, respectively, and between the slots 44 and 55, electric power is supplied. The input block 65 is attached. Further, between the slots 36 and 59, a power input block 65 having the same structure as the power input block 65 shown in FIG. 5 but having a short block main body 68 is mounted. As a result, the current-carrying rods 60 in the corresponding slots are electrically connected by the connection block 64 or the power input block 65.

On the other hand, at the other end of the stator body 35, as shown in FIG. 8, connection blocks 64 are mounted between the slots 36 to 47 and the slots 48 to 59, respectively. As a result, the current-carrying rods 60 in the corresponding slots are electrically connected by the connection block 64.

At this time, for example, slot 4 in FIG.
The connection block 64 mounted between 7 and 58 is mounted over the other connection block 64 and the power input block 65, but the block body 66 of the connection block 64 is flexible. Since the block main body 66 has such a structure, the connecting pin 67 can be fitted into the conductive wire 62 of the current-carrying rod 60 without any hindrance. Similarly, the power input block 65 mounted over the other connection block 64 and the power input block 65 is also connected to the end of the energization rod 60 in a state where the block body 68 is bent.

A current-carrying rod 60 as shown in FIGS. 7 and 8.
By making the connection, the electric circuit as shown in the connection diagram of FIG. 9 is formed. Therefore, the slots 36, 40
And three power input blocks 65 with one end attached to
The three-phase AC power is supplied so that the U-phase, the V-phase, and the W-phase are input from the power supply terminal 70. This allows
A rotating magnetic field is generated.

Connection block 64 and power input block 6
Since the wiring between the energizing rods 60 was performed using 5,
Since both ends of the stator body 35 are clean, the bulkiness of the stator winding as in the prior art is eliminated, and a small induction motor is realized.

Connection block 64 and power input block 6
Since 5 is detachably fitted to the end portion of the current-carrying rod 60, these blocks can be easily removed from the current-carrying rod 60 and replaced with another block. The connection block 64 shown in FIG.
At one end of 5, the current-carrying rod 60 is inserted into every tenth slot like slots 37 and 48, or at the other end of the stator body 35, slots 36 and 4 are inserted.
Although the current-carrying rods 60 inserted into every 11th slot as shown in FIG. 8 are connected to each other, a connection block in which the length of the block body 66 is changed is formed, and instead of the connection block 64 of FIG. By using the connection blocks whose intervals are changed in this way, it is possible to change the number of poles of the induction motor. In the illustrated embodiment, the stator main body 35 has 24 slots, but the present invention is not limited to this.
For example, a stator body having about 48 slots can be used.

By replacing the connection block 64 and the power input block 65 with another block, the wiring method of the motor can be changed, and the characteristics of the motor can be maximized by adapting to the purpose of use and peripheral circuits. It is possible to withdraw.

Further, by increasing or decreasing the number of connecting pins 67 and 69 of the connecting block 64 and the power input block 65 with the maximum number of the conductive wires 62 built in the energizing rod 60, the current flowing in the motor is adjusted. You can also do it.

In the illustrated embodiment, the conductive wire 62 of the energizing rod 60 has a tubular end, and the connecting block 64 and the connecting pins 67 and 69 of the power input block 65 are fitted therein. The end of the conductive wire may be formed in a pin shape, and the pin may be fitted into a pipe member or a hole formed in the connection block and the power input block.

The illustrated connection block 64 and power input block 65 have a plurality of connection pins 67 and 69, respectively.
Although it had a set, it has a plurality of connection pins of 3 or more sets,
You may make it connect to three or more electricity supply rods at the same time. Further, without dividing into a plurality of connection blocks 64 and power input blocks 65, one ring-shaped block may be provided with connection pins and power terminals connected to the energization rods of all slots. Such a ring-shaped block can be created by applying semiconductor manufacturing technology.

[Brief description of drawings]

FIG. 1 is a perspective view showing a stator body used in a stator structure of an induction motor according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing a current-carrying rod used in the stator structure according to the embodiment.

FIG. 3 is an end view of a slot main body in which a current-carrying rod is inserted into the slot.

FIG. 4 is a perspective view showing a connection block used in the stator structure according to the embodiment.

FIG. 5 is a perspective view showing a power input block used in the stator structure according to the embodiment.

FIG. 6 is an assembly diagram of a stator structure according to the embodiment.

FIG. 7 is an end view showing one end of the stator structure according to the embodiment.

FIG. 8 is an end view showing the other end of the stator structure according to the embodiment.

FIG. 9 is a wiring diagram of the stator structure according to the embodiment.

FIG. 10 is an exploded perspective view showing the configuration of a conventional motor.

FIG. 11 is a vertical cross-sectional view of a stator in a conventional motor.

FIG. 12 is an end view of a stator in a conventional motor.

FIG. 13 is a wiring diagram of a stator in a conventional motor.

[Explanation of symbols]

 35 stator body 36 to 59 slot 60 energizing rod 61 rod body 62 conductive wire 63 concave surface 64 connection block 65 power input block 66,68 block body 67,69 connection pin 70 power supply terminal

Claims (3)

[Claims] 1. A stator body having a substantially cylindrical shape and having a plurality of slots formed in the inner peripheral surface along the length direction of the cylinder, and a stator body detachably inserted into each slot of the stator body. And a plurality of conducting rods each containing a conductor extending from one end to the other end of each slot, and detachably fitted to the end portions of at least two or more conducting rods at the end portion of the stator body. Connection block for electrically connecting the conductors of the current-carrying rod to each other, and detachably fitted to the end of the corresponding current-carrying rod at the end of the stator body and electrically connected to the conductor of the current-carrying rod. A stator structure for an induction motor, comprising: a power input block having a connected power supply terminal. 2. Each of the current-carrying rods has a rod body made of an insulator, and the conductor is made of a plurality of conductive wires embedded in the rod body and electrically insulated from each other. The structure according to 1. 3. The structure according to claim 2, wherein the connection block and the power input block have a plurality of connection pins respectively connected to a plurality of conductive wires of the energizing rod.