JPH09331644A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor which has desired characteristics and which can be manufactured easily. SOLUTION: Four slender rectangular magnetic blackets 23 and four installation blackets 24, which are extended in the axis direction of a cylinder A, are alternatedly connected to form a cylindrical stator assembly 21. Each of the magnetic blackets 23 is made by winding a coil 27 around a block 26 which has bent sections at both ends and has a U-shaped cross section. Inside the stator assembly 21, a rotor assembly 22 is rotatably located and six permanent magnets 31 are installed at equal intervals on an outer face of a rotor section 30 in its circumferential direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor,
In particular, the present invention relates to the structure of a motor stator assembly and a rotor assembly.

[0002]

2. Description of the Related Art The structure of a conventional induction motor is shown in FIGS.
Shown in A stator 1 composed of a laminate of a large number of ring-shaped members is housed in a cylindrical frame 2 to form a stator assembly, and a rotor assembly 3 having a shaft 6 is inserted inside the stator assembly. End brackets 7 and 8 that pivotally support a shaft 6 of the rotor assembly 3 are fixed to both ends of the frame 2 via bearings 4 and 5, respectively, by bolts 9.

As shown in FIG. 10, the rotor assembly 3 has a laminated body of a large number of disc-shaped members 10 shrink-fitted on a shaft 6, and a plurality of slots formed in each disc-shaped member 10. Slot bars 11 are inserted in the respective insides. Further, when manufacturing the stator 1, conventionally,
As shown in FIG. 11, after ring-shaped members 12 made of a silicon steel plate punched out by a press or the like are stacked and inserted into the frame 2, inside the plurality of slots 13 of the ring-shaped member 12 depending on how the current flows. The copper wire 14 was fitted in.

[0004]

As described above, the conventional stator assembly and rotor assembly of the motor have complicated structures, and the number of manufacturing steps is large, resulting in low productivity. Particularly, the work of fitting the copper wire 14 into the slot 13 of the stator assembly requires a great deal of labor and skill, and therefore, it is difficult to change the diameter of the motor and the axial length thereof. It was difficult to obtain the desired characteristics as

The present invention has been made to solve the above problems, and an object of the present invention is to provide a motor having desired characteristics and easily manufactured.

[0006]

A motor according to the present invention has a cylindrical shape formed by alternately connecting a plurality of strip-shaped magnetic brackets each having a coil wound around it and a plurality of strip-shaped mounting brackets. The stator assembly of
A rotor assembly is provided inside the stator assembly so as to be rotatable about a central axis of the cylinder and has a plurality of magnetic poles evenly distributed along the circumferential direction.

As the magnetic bracket, one in which a coil is wound around a block having a U-shaped cross section in which both side edges of a strip are bent so as to project toward the central axis of the cylinder can be used. It is also possible to divide the coil into a plurality of parts in the axial direction of the cylinder and wind each coil. Further, the rotor assembly is provided with a shaft rotatably provided around a central axis of a cylinder, a cylindrical rotor portion formed around the shaft, and a rotor portion embedded in an outer peripheral surface of the rotor portion and having a length of the shaft. It may be composed of a plurality of permanent magnets extending in the direction, and magnetic poles of different polarities may be arranged alternately along the circumferential direction by the plurality of permanent magnets. Further, the coil of the magnetic bracket is protected by providing a protective cover that covers the outer peripheral portion of the stator assembly.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a cross section of a motor according to an embodiment of the present invention. A rotor assembly 22 is arranged inside a cylindrical stator assembly 21. The stator assembly 21 is formed in a cylindrical shape by alternately connecting four strip-shaped magnetic brackets 23 extending in the axial direction of the cylinder A and four strip-shaped mounting brackets 24 that are also strip-shaped. Each of the magnetic brackets 23 has a bent portion 25 that is bent so that both side edges of the strip shape project toward the central axis of the cylinder A.
A block 26 having a U-shaped cross section, and this block 2
6 is provided with a coil 27 wound in the length direction of the strip. In this embodiment, each block 26 is divided into five in the axial direction of the cylinder A. Moreover, the outer peripheral portion of the stator assembly 21 is covered with a protective cover 28.

The rotor assembly 22 has a shaft 29.
It has a cylindrical rotor portion 30 formed around, and six permanent magnets 31 are evenly distributed along the circumferential direction on the outer peripheral surface of the rotor portion 30. Each permanent magnet 31 is a rod-shaped magnet extending in the length direction of the shaft 29, and magnetic poles having different polarities, that is, N pole and S pole, are formed on a pair of long side surfaces facing each other. The permanent magnet 31 is oriented such that magnetic poles of different polarities are alternately arranged along the circumferential direction of the rotor portion 30.
Buried in The shaft 29 is located on the central axis of the cylinder A, and is rotatably provided by a pair of bearings 32 and 33, as shown in FIG.

Next, a method of manufacturing the stator assembly 21 will be described. First, as shown in FIG. 3, a block 26 having a U-shaped cross section is formed. Bent portions 25 are formed on both side edges of the block 26, and two through holes 35 for attachment are formed in each bent portion 25. This block 2
6, the coil 27 is wound as shown in FIG.

As shown in FIG. 5, the five blocks 26 each having the coil 27 wound in this manner are
It is attached to a strip-shaped mounting bracket 24. The mounting bracket 24 has flanges 36 formed along both side edges of the mounting bracket 24, and has ten bolt holes 37 arranged in the lengthwise direction on both side surfaces. The bent portion 25 of each block 26 is attached to the flange 36 of the mounting bracket 24.
The mounting bolt 38 is passed through the through hole 35 of the block 26 and screwed into the bolt hole 37. Similarly,
The five blocks 26 are sequentially fixed to the mounting bracket 24.

The coils 27 wound around the five blocks 26 are connected in parallel with each other as shown in FIG. 6, for example. Alternatively, they are connected in series with each other, as shown in FIG. The connection method of this coil 27 is
It is appropriately determined according to the output characteristics of the motor to be assembled, the drive current, the voltage, and the like. In this way, the magnetic bracket 23 is formed by the five blocks 26 fixed to the mounting bracket 24 and having the coils 27 connected to each other.

A cylindrical stator assembly 21 is formed by connecting the assembly of the mounting bracket 24 and the five blocks 26 in the same manner as four sets. Further, in order to protect the coil 27, the outer peripheral portion of the stator assembly 21 is covered with a protective cover 28.

With the rotor assembly 22 housed inside the stator assembly 21, end brackets (not shown) are provided at both ends of the stator assembly 21, and the bearings 32 and 33 fitted to the shaft 29 of the rotor assembly 22 are terminated. Hold it in the bracket. As a result, the rotor assembly 22 is rotatably supported and the motor is completed.

During operation of this motor, for example, a rectangular wave current is formed from a direct current using an inverter, and this rectangular wave current is passed through the coils 27 of the four magnetic brackets 23 of the stator assembly 21 to form a rotating magnetic field. Then, the rotor assembly 22 is rotated. At this time, when a rectangular wave current is passed through the coil 27, magnetic poles having polarities different from each other are formed at the tips of the bent portions 25 on both side edges of each block 26, and these magnetic poles and the rotor assembly 2
The rotor assembly 22 is rotated by the attractive force and the repulsive force acting between the magnetic poles of the second permanent magnet 31.

The block 26 and the mounting bracket 24 of the stator assembly 21 are made of, for example, iron, and the rotor portion 30 of the rotor assembly 22 is made of, for example, resin.

In the above embodiment, the four magnetic brackets 23 and the four mounting brackets 24 form the 8-pole cylindrical stator assembly 21. However, by changing the number of magnetic brackets and mounting brackets The number of poles can be changed. Moreover, although the block 26 of one magnetic bracket is divided into five, the coil 27 is not divided into a plurality but is formed into an integral block.
May be wound or may be divided into blocks of a number other than five.

In the above embodiment, the six permanent magnets 31 are embedded in the outer peripheral surface of the rotor portion 30 to form the rotor assembly 22 having 6 poles. However, rotor assemblies having other pole numbers may be constructed. .

As described above, according to the present invention,
Since a magnetic bracket having a U-shaped cross section is used for the stator assembly, there is a space portion to improve heat dissipation. Therefore, a motor that is strong against overheating can be obtained. Further, the structure of the stator assembly and the rotor assembly is simplified, and the work of fitting the copper wire into the slot, which requires a great deal of labor and skill as in the past, is not required. Therefore, the productivity is improved and the manufacturing cost is improved. Can be reduced. Furthermore, since the structure is simple, it is possible to easily obtain a motor having desired characteristics by changing the number of poles and dimensions of the motor.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a motor according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a rotor assembly used in the motor of the embodiment.

FIG. 3 is a perspective view showing a block used in the stator assembly of the motor according to the embodiment.

FIG. 4 is a perspective view showing a block around which a coil is wound.

FIG. 5 is a partial assembly view of a stator assembly in the motor of the embodiment.

FIG. 6 is a wiring diagram of a stator in the motor of the embodiment.

FIG. 7 is another wiring diagram of the stator in the motor of the embodiment.

FIG. 8 is a perspective view showing a conventional motor.

FIG. 9 is a cross-sectional view showing a conventional motor.

FIG. 10 is a perspective view showing a conventional rotor assembly.

FIG. 11 is an end view showing a conventional stator assembly.

[Explanation of symbols]

 21 Stator Assembly 22 Rotor Assembly 23 Magnetic Bracket 24 Mounting Bracket 25 Bending Part 26 Block 27 Coil 28 Protective Cover 29 Shaft 30 Rotor Part 31 Permanent Magnet 32, 33 Bearing 35 Through Hole 36 Flange 37 Bolt Hole 38 Mounting Bolt

Claims (5)

[Claims] 1. A cylindrical stator assembly formed by alternately connecting a plurality of strip-shaped magnetic brackets each having a coil wound around and a plurality of strip-shaped mounting brackets, and inside the stator assembly. A motor comprising: a rotor assembly rotatably arranged around a central axis of a cylinder and having a plurality of magnetic poles evenly distributed along a circumferential direction. 2. The magnetic bracket is characterized in that the coil is wound around a block having a U-shaped cross section, which is bent so that both side edges of the strip protrude toward the central axis of the cylinder. The motor according to claim 1. 3. The motor according to claim 2, wherein the block is divided into a plurality of pieces in the axial direction of the cylinder, and a coil is wound around each of the divided blocks. 4. The rotor assembly includes a shaft rotatably provided around a center axis of the cylinder, a cylindrical rotor portion formed around the shaft, and embedded in outer peripheral surfaces of the rotor portions. And a plurality of permanent magnets extending in the longitudinal direction of the shaft, wherein the plurality of permanent magnets have magnetic poles of different polarities arranged alternately along the circumferential direction. The motor according to any one of claims. 5. The motor according to claim 1, further comprising a protective cover that covers an outer peripheral portion of the stator assembly.