JP2012039732A - Motor and assembly method of the same - Google Patents

Abstract

An object of the present invention is to maintain a motor performance without widening a gap between a rotor core and a stator core, and to prevent a rotor core or a stator core from being peeled and damaged during assembly and disassembly. An electric motor capable of improving assemblability and disassembly and a method for assembling the same are provided.
A rotor core is formed by inserting and fixing a rotary shaft 30a to a stator core 10 in which a stator coil 11 is wound around a stator core 10 formed in a cylindrical shape, and a rotor core 20 formed in a cylindrical shape. And a pair of balance rings 40a, 40b inserted and fixed on both sides of the rotor core 20 on the rotary shaft 30a, and a pair of balance rings 40a, The outer diameter of 40 b is set to be larger than the outer diameter of the rotor core 20 and smaller than the inner diameter of the stator core 10.
[Selection] Figure 1

Description

  The present invention relates to an electric motor having a rotor in which a permanent magnet is embedded in a rotor core and an assembling method thereof.

In the structure of an electric motor having a rotor in which a permanent magnet is embedded in a rotor core, it is known to use a flexible magnet cap made of a non-magnetic material that covers the outer periphery of the end of the rotor core. Patent Document 1).
According to this rotor structure, the rotor core and the stator core do not directly contact and rub against each other during assembly, so that the permanent magnets of the rotor are not lost and damaged.

Japanese Unexamined Patent Publication No. Sho 63-110944

However, the above structure has the following problems.
Both ends of the outer peripheral corner of the rotor core are covered with magnet caps so that the rotor core and stator core do not come into contact. In this case, the magnet cap and stator core come into contact when the rotor rotates. It is necessary not to do. Therefore, the gap between the rotor core and the stator core is widened by the thickness of the magnet cap.
However, when the gap between the rotor core and the stator core is increased, the motor performance is degraded. In order to maintain the motor performance, there has been a problem that the size of the motor has to be increased, for example, the core length is increased.

  In view of the above problems, the present invention can maintain the motor performance without widening the gap between the rotor core and the stator core, and can also maintain the rotor core or the stator core during assembly and disassembly. It is an object of the present invention to provide an electric motor and an assembling method thereof that can improve assembling and disassembling without peeling damage.

  An electric motor according to the present invention includes a stator in which a stator coil is wound around a cylindrically formed stator core, and a rotating shaft inserted through and fixed to the cylindrically formed rotor core. A rotor in which a permanent magnet is embedded in a peripheral edge; and a pair of balance rings inserted and fixed on both sides of the rotor core on the rotation shaft, and an outer diameter of the pair of balance rings is the rotor core The outer diameter of the stator core is smaller than the inner diameter of the stator core.

  According to this invention, the permanent magnet or rotor core attached to the outer periphery of the rotor core remains adsorbed on the stator core during assembly when the rotor is inserted into the stator and during disassembly when the rotor is pulled out of the stator. Without rubbing, it is possible to prevent the permanent magnet from being damaged, and the rotor iron core and the magnetic steel sheet of the stator iron core from being peeled off and damaged. In addition, since no protective material is attached to the rotor core, there is no need to increase the gap between the rotor core and the stator core, so that it is possible to prevent a reduction in motor performance.

It is sectional drawing of the electric motor which concerns on Embodiment 1 of this invention. It is the side view and top view which show the balance ring in Embodiment 1. 3 is a cross-sectional view showing an assembly process and a disassembly process of the electric motor according to Embodiment 1. FIG. FIG. 6 is another cross-sectional view showing the assembly process and the disassembly process of the electric motor according to Embodiment 1. It is sectional drawing which shows the assembly process and disassembly process of the electric motor which concerns on Embodiment 2 of this invention. It is the side view and top view which show the balance ring in Embodiment 2 of this invention.

Embodiment 1 FIG.
As shown in FIG. 1, the stator core 10 is inserted and fixed along the inner peripheral surface of the frame 33 of the electric motor. The stator core 10 is formed by stacking electromagnetic steel plates 12 into a cylindrical shape, and a stator coil 11 is wound around the stator core 10. The lead wire 11a of the stator coil 11 is connected to a power supply unit (not shown). A rotating magnetic field is generated in the stator coil 11 by sequentially energizing, for example, three-phase U, V, and W phases to the lead wire 11 a of the stator coil 11.
The rotor core 20, balance rings 40a and 40b, and bearings 31a and 31b are inserted and fixed to the rotating shaft 30a of the electric motor. The rotor core 20 is formed in a cylindrical shape by laminating electromagnetic steel plates 22, and permanent magnets 21 having a strong magnetic force are embedded in a plurality of slots 23 formed in the periphery of the rotor core 20 in parallel with the rotation shaft 30 a. . The rotor core 20 is rotated by the rotating magnetic field generated by the stator coil 11 and the magnetic force of the permanent magnet 21.
A rear bracket 32a and a front bracket 32b are attached to both ends of the frame 33, and the rotary shaft 30a is rotatably supported by the rear bracket 32a and the front bracket 32b via bearings 31a and 31b, respectively.

In the above structure, the balance rings 40a and 40b are for correcting the rotational unbalance of the rotor, and are disposed between the rotor core 20 and the bearings 31a and 31b. In addition, this balance ring 40a, 40b is formed in an annular shape as shown in FIG. 2, the corners of the outer peripheral surface thereof is removed like chamfering, the outer diameter d _B as shown in FIG. 1, The dimensions are set to be not less than the outer diameter d of the rotor core 20 and less than the inner diameter D (d ≦ d _B <D) of the stator core 10. As an example, the outer diameter d = 100 mm, when the inner diameter D = 102 mm, outer diameter _{d B} is set to 101 mm.

When the rotor is inserted into the stator and assembled, as shown in FIG. 3, the rotor core 20, balance rings 40a and 40b, bearings 31a and 31b, and the front bracket 32b are attached to the rotary shaft 30a. First, the end of the rotating shaft 30 a is inserted into the end of the stator core 10. Subsequently, when the end portion of the balance ring 40 a on the insertion end side is inserted into the end portion of the stator core 10, the balance ring 40 a is inserted while being brought into contact with the inner peripheral surface of the stator core 10. .
In this case, since the corners of the outer peripheral surface of the balance ring 40a are removed by chamfering or the like, the contact area between the balance ring 40a and the stator core 10 is increased, the load at the time of contact is dispersed, and the stator core 10 This prevents the electromagnetic steel sheet 12 from being damaged.

Next, when the rotor core 20 is inserted into the stator core 10, the rotor core 20 in which the permanent magnets 21 are embedded is attracted to the stator core 10. However, the outer peripheral portion of the balance ring 40a having an outer diameter d _B of the above outer diameter d of the rotor core 20 as shown in FIG. 5, by inserting continues and along the inner peripheral surface directly to the stator core 10 The rotor core 20 can be prevented from adsorbing to the stator core 10. As a result, since the rotor core 20 and the stator core 10 are not strongly rubbed while being strongly magnetized, it is possible to prevent the electromagnetic steel plate 12 of the stator core 10 and the electromagnetic steel plate 22 of the rotor core 20 from being peeled and damaged.
As shown in FIG. 4, when the balance ring 40a is removed from the left end of the stator core 10, the bearing 31a on the insertion end side is engaged with the rear bracket 32a and assembled. The rotor core 20 and the stator core 10 can be prevented from contacting each other. Thus, the assembly of the rotating shaft 30a is completed.

On the other hand, when the rotor core 20 is pulled out and disassembled from the stator core 10, the bearing 31a can first be disassembled while being engaged with the rear bracket 32a, and the rotor core 20 and the stator core 10 can be prevented from contacting each other. .
Next, as shown in FIG. 4, when the bearing 31 a passes through the rear bracket 32 a, the rotor 31 is disassembled while bringing the outer peripheral surface of the balance ring 40 a into contact with the inner peripheral surface of the stator core 10. It is possible to prevent the iron core 20 and the stator iron core 10 from contacting each other.
The disassembly is completed by pulling out the outer peripheral surface of the balance ring 40a as it is along the inner peripheral surface of the stator core 10.

  As described above, according to the electric motor and the assembling method thereof according to Embodiment 1 of the present invention, the outer diameters of the pair of balance rings 40a and 40b inserted and fixed on both sides of the rotor core 20 on the rotating shaft 30a. Since the dimension is set to be larger than the outer diameter of the rotor core 20 and smaller than the inner diameter of the stator core 10, at the time of assembly for inserting the rotor into the stator and at the time of disassembly for extracting the rotor from the stator, The permanent magnet 21 attached to the outer peripheral portion of the rotor core 20 or the electromagnetic steel plate 22 of the rotor core 20 is not rubbed while adsorbed to the stator core 10, and damage to the permanent magnet 21 or the electromagnetic steel plate 22 of the rotor core 20. The electromagnetic steel plate 12 of the stator core 10 can be prevented from peeling off and being damaged. In addition, since no protective material is attached to the rotor core 20, there is no need to increase the gap between the rotor core 20 and the stator core 10, and a reduction in motor performance can be prevented.

Embodiment 2. FIG.
FIG. 5 is a cross-sectional view showing an electric motor according to the second embodiment of the present invention, and FIG. 6 is a view showing a balance ring 40c in the second embodiment.
In the process of inserting and assembling the rotor core 20 into the stator core 10, as shown in FIG. 5, when the balance ring 40c passes through the end of the stator core 10, the dimension of the rotary shaft 30b is short, and the bearing 31a. May not be structured to be engaged and assembled with the rear bracket 32c.
Therefore, in the second embodiment, as shown in FIG. 5, a pin 50 having a column shape, a rear bracket 32 c having a pin hole 34 engaged with the column shape of the pin 50, and a balance ring 40 c having a pin hole 44. The balance ring 40c is engaged with the pin 50 and inserted at the stage of inserting and assembling the rotor into the stator. Thereby, the rotor core 20 can be prevented from being adsorbed to the stator core 10.
Then, the bearing 31a is inserted until the insertion end side bearing 31a reaches the left end of the rear bracket 32c, which is the insertion end side bracket, and thereafter, the bearing 31a is engaged with the rear bracket 32c and inserted.
Thus, the assembly of the rotating shaft 30b is completed. After the assembly is completed, the pin 50 is pulled out from the balance ring 40c and the rear bracket 32c.

  On the other hand, when the rotor core 20 is pulled out and disassembled from the stator core 10, the bearing 31a is engaged with the rear bracket 32c and disassembled. When the bearing 31a passes through the rear bracket 32c, the pin 50 is inserted into the pin hole 34 of the rear bracket 32c and the pin hole 44 of the balance ring 40c. And it can prevent that the rotor core 20 and the stator core 10 contact by disassembling, engaging with the pin 50. FIG. When the balance ring 40c comes off the pin 50, the rotor core 20 and the stator core 10 come into contact with each other by disassembling the outer peripheral surface of the balance ring 40c along the inner peripheral surface of the stator core 10. Can be prevented. Then, the disassembly is completed by pulling out the outer peripheral surface of the balance ring 40 c as it is along the inner peripheral surface of the stator core 10.

  As described above, according to the second embodiment of the present invention, the outer diameters of the pair of balance rings 40b and 40c inserted and fixed on both sides of the rotor core 20 on the rotation shaft 30b are the outer diameters of the rotor core 20. The outer peripheral surface of the balance ring 40c on the insertion end side of the pair of balance rings 40b, 40c when the rotor is inserted into the stator and assembled when set to a size larger than the diameter and smaller than the inner diameter of the stator core 10. Is inserted in contact with the inner peripheral surface of the stator core 10, and when the balance ring 40 c on the insertion end side passes through the end portion of the inner peripheral surface of the stator core 10, the balance ring 40 c on the insertion end side is removed. The bearing 31a on the insertion end side is assembled to the bracket 32c on the insertion end side by engaging and supporting the pin-shaped pin 50 provided through the bracket 32c located on the insertion end side. Even when the bearing 31a is not structured to be engaged with the rear bracket 32c, the balance ring 40c is engaged with the pin 50 after the balance ring 40c has passed through the end of the stator core 10. Therefore, the rotor core 20 and the stator core 10 can be prevented from coming into direct contact with each other and rubbed against each other, whereby the magnetic steel sheets of the stator core 10 and the rotor core 20 are not peeled and damaged.

DESCRIPTION OF SYMBOLS 10 Stator core 11 Stator coil 11a Lead wire 12 Magnetic steel plate 20 Rotor iron core 21 Permanent magnet 22 Magnetic steel plate 23 Slots 30a, 30b Rotating shaft 31a, 31b Bearing 32a Rear bracket 32b Front racket 32c Rear bracket 33 Frame 34 Pin hole 40a, 40b, 40c Balance ring 41 Outer periphery 44 Pin hole 50 Pin

Claims (5)

A stator in which a stator coil is wound around a cylindrically formed stator core, and a rotating shaft is inserted and fixed in the cylindrically formed rotor core, and permanent magnets are embedded in the periphery of the rotor core. And a pair of balance rings inserted and fixed on both sides of the rotor core on the rotating shaft,
An electric motor characterized in that an outer diameter of the pair of balance rings is set to be larger than an outer diameter of the rotor core and smaller than an inner diameter of the stator core.   The electric motor according to claim 1, wherein the pair of balance rings have corners of an outer peripheral portion removed. A stator in which a stator coil is wound around a cylindrically formed stator core, and a rotating shaft is inserted and fixed in the cylindrically formed rotor core, and permanent magnets are embedded in the periphery of the rotor core. A rotor fixed to both ends of the rotating shaft, a pair of balance rings inserted and fixed between the rotor core and the bearing on the rotating shaft, and the stator supported In a method for assembling an electric motor comprising brackets attached to both ends of a frame and rotatably supporting the rotor and the balance ring via the bearings,
The outer diameter of the pair of balance rings is set to be larger than the outer diameter of the rotor and smaller than the inner diameter of the stator;
When inserting and assembling the rotor into the stator,
Of the pair of balance rings, insert the outer peripheral surface of the balance ring on the insertion end side along the inner peripheral surface of the stator core,
When the balance ring on the insertion end side passes through the end portion of the inner peripheral surface of the stator core, the bearing on the insertion end side engages with the bracket on the insertion end side and is assembled. Assembling method of the electric motor. A stator in which a stator coil is wound around a cylindrically formed stator core, and a rotating shaft is inserted and fixed in the cylindrically formed rotor core, and permanent magnets are embedded in the periphery of the rotor core. A rotor that is fixed to both ends of the rotating shaft, a pair of balance rings that are inserted and fixed between the rotor and the bearing on the rotating shaft, and a frame that supports the stator In the assembling method of the electric motor comprising: brackets attached to both ends of the rotor and rotatably supporting the rotor and the balance ring via the bearings;
The outer diameter of the pair of balance rings is set to be larger than the outer diameter of the rotor and smaller than the inner diameter of the stator;
When inserting and assembling the rotor into the stator,
Of the pair of balance rings, insert the outer peripheral surface of the balance ring on the insertion end side along the inner peripheral surface of the stator core,
When the balance ring on the insertion end side passes through the end portion of the inner peripheral surface of the stator core, the balance ring on the insertion end side is formed in a columnar shape provided through a bracket located on the insertion end side. An electric motor assembling method, wherein the motor is engaged and supported by a pin, and the bearing on the insertion end side is assembled to the bracket on the insertion end side.   5. The electric motor according to claim 4, wherein the columnar pin is inserted into a pin hole provided in the bracket located on the insertion end side and a pin hole provided in the balance ring on the insertion end side. Assembly method.

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