JP2001320850A - Motor and shaft center adjustment method - Google Patents

Abstract

(57) [Problem] To provide an electric motor capable of easily adjusting a gap between a stator and a rotor, and a method of adjusting an axial center thereof. An electric motor can move a plurality of terminals for measuring voltages of a plurality of pole windings forming a winding of a stator and a radial position of the stator with respect to an axis of the stator. A stator moving mechanism 43 is provided, a voltage value of each winding is measured using a voltage measuring device 70, and the stator 34 is moved so as to make the voltage values uniform. To make the gap uniform.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor having a device for adjusting a shaft center when assembling the motor, and a shaft center adjusting device.

[0002]

2. Description of the Related Art FIG. 11 is a cross-sectional view for explaining a conventional motor center adjustment method described in Japanese Patent Application Laid-Open No. 7-15926. In FIG. 11, the electric motor is operated using the frame support device 5 and the end bracket support devices 6 a and 6 b with the mounting bolts 4 loosened, the generated noise is measured by the noise measurement device 7, and the frequency is measured by the frequency analysis device 9. Then, the measured frequency component and level of the noise are analyzed and input to the fixed position control device 10.

[0003] The fixed position control device 10 refers to a database stored in the device to calculate the fixed position of the end brackets 2a, 2b at which the noise measurement value is minimum,
A command is given to the fitting position adjusting devices 11a and 11b to move the end bracket supporting devices 6a and 6b, and the mounting bolts 4 are tightened to the frame 1 by the bolt tightening device 8.

As described above, the shaft center is adjusted so as to minimize the noise generated by the eccentricity of the rotating shaft.

[0005]

However, in order to adjust the shaft center of the electric motor, the noise is measured by the noise measuring device 7, the measurement result is analyzed by the frequency analyzing device 9, and the database stored in advance is stored. As a reference, the end brackets 2a, 2a
Since the fixed position of b must be calculated, the operation of creating the database is complicated and time-consuming. Moreover, the end brackets 2a, 2b
Since the fixing bolt 4 is tightened after the fixing position is determined, the operation becomes complicated.

[0006] In addition, without creating a database, the end brackets 2a, 2b
Since the fixed position had to be searched for by trial and error, the operation became more complicated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide an electric motor capable of easily adjusting a gap between a stator and a rotor, and an axial center adjusting method thereof. I have.

[0008]

An electric motor according to the present invention comprises:
The stator includes a plurality of terminals for measuring a voltage between a plurality of windings forming a winding of the stator, and a stator moving device capable of moving a position in a radial direction with respect to an axis of the stator.

The plurality of terminals may include external connection terminals provided on an outer wall of a case of the motor.

Further, the plurality of terminals may include a plurality of relay terminals connected to the external connection terminals and provided in a case of the electric motor.

A relay terminal supporting member for supporting the relay terminal, wherein the winding comprises a plurality of main windings and a plurality of auxiliary windings, and the relay terminal supporting member is superposed on an iron core of the stator; And a winding portion for winding the main winding and the auxiliary winding.

Further, the relay terminals may each have three terminals and may be arranged between the main windings.

Further, the case is divided into two parts in the axial direction,
The stator moving mechanism may include a claw-shaped piece formed at one end of the divided case, and move the stator by bending the claw-shaped piece.

Further, the case is divided into two parts in the axial direction,
The stator moving mechanism may move the stator by a bolt screwed to an end side surface of the divided case.

Further, the stator moving mechanism may be provided in accordance with the position of the teeth of the stator.

Further, the same number of stator moving mechanisms as the number of teeth of the stator may be provided.

Further, the stator moving mechanism may be provided at a position facing a central portion of the main winding and the auxiliary winding.

The method for adjusting the shaft center of the electric motor according to the present invention comprises:
Measure each voltage between a plurality of windings forming the stator winding of the motor, and use the stator moving device to adjust the position of the stator so that each voltage between the stator windings of the motor becomes uniform. It is to adjust.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 of the Invention Embodiment 1 of the present invention will be described with reference to the drawings.

FIG. 1 shows an axial sectional view of a single-phase induction motor according to Embodiment 1 of the present invention. FIG. 2 shows a radial cross-sectional view of the single-phase induction motor according to Embodiment 1 of the present invention. FIG. 3 is a circuit diagram illustrating the connection between the stator winding and the voltage measuring device of the single-phase induction motor according to the first embodiment of the present invention.

Referring to FIGS. 1 and 2, the single-phase induction motor comprises a rotor 32 having a shaft 31 at the center and a number of thin steel plates laminated on each other, and a fixed hole having a hole through the rotor 32 at the center. And a frame 40 accommodating the rotor 32, the stator 34, the main winding 36 and the auxiliary winding 38, a main winding 36 and an auxiliary winding 38 wound around slots of the stator 34, and An outer ring is fitted and fixed to a bracket 42, a concave portion 40 a formed at an end of the frame 40, and a bearing 44 for fitting and fixed an inner ring to the shaft 31, and a concave portion 42 a formed at an end of the bracket 42. Bearing 4 in which the outer ring is fitted and fixed and the inner ring is fitted and fixed to shaft 31
6, and is formed so as to have a predetermined gap g between the outer diameter of the rotor 32 and the inner diameter of the stator 34.

At the end of the frame 40, there is provided a claw-shaped stator moving adjusting piece 43 capable of accommodating the end of the bracket 42. Adjusting piece 43 for moving the stator
Is located at a position facing each winding, that is, 4 in FIG.
Place it at a location.

The stator moving adjusting piece 43 has a substantially L-shaped cross section. When the stator 34 is fitted on the inner wall of the frame 40, the stator moving adjusting piece 43 is formed. Is bent in a direction to open outward, so that a root portion of the stator moving adjusting piece 43 protrudes inward, and the position of the stator can be pushed inward.

As shown in FIG. 2, the main winding 36 is wound around four poles 36a, 36b, 36c and 36d, and intermediate terminals a1, b1, c1 and d are provided between the respective windings.
1, e1 are prepared. From each of the above terminals,
Main external terminals 91 (A1, B1, C1, D1, and E) prepared in a terminal box 90 prepared on the outer shell of the frame 40.
1) is connected by a lead wire.

A method of adjusting the axial center of the rotor of the electric motor configured as described above will be described with reference to FIGS. 2, 3 and 4.

FIG. 3 is a circuit diagram showing that the main winding and the auxiliary winding of the electric motor according to the first embodiment of the present invention are connected to power supply 69 and voltage measuring instrument 70 by main external terminals 91. is there.

In FIG. 2, the rotor 32 has an axis shifted from the inner diameter of the stator 31. FIG. 4 shows FIG.
FIG. 7 is a curve diagram showing a relationship between a coil voltage and an eccentric amount of a rotor shaft center in a state driven by the circuit in FIG.

First, when the switch 67 is turned on, the main winding 36 of the electric motor from the AC power supply 69 via the main external terminals A1 and E1 and the auxiliary winding 3 through the capacitor 75.
8, and the rotor 32 rotates.

When the motor is rotating, the input terminals I1 and I2 of the voltage measuring device 70 are connected to the A1
-B1, B1-C1, C1-D1, and D1-E1 are connected in order, and the voltage value Va of the main winding 36a, the voltage value Vb of the 36b, the voltage value Vc of the 36c, and the voltage value Vd of the 36d are connected.
Are measured, and each voltage value is compared.

If the axes of the rotor 32 and the stator 34 coincide, that is, if the gap g is constant over the entire circumference, the measured voltage values Va, Vb, Vc, and Vd are the same. It is not necessary to adjust the gap g.

However, as shown in FIG. 2, if the axis of the rotor 32 is shifted to the right from the center O of the stator,
The gap g1 on the right is narrow and the gap g2 on the left is wide.

The magnetic flux generated from the main winding 36a on the narrow gap side flows to the rotor 32, and the magnetic flux density increases as the rotor 32 approaches. Conversely, the main winding 3 on the wide gap side
6c flows to the rotor 32, and the rotor 32
Distant, the magnetic flux density decreases.

Due to the non-uniformity of the magnetic flux, the voltage measured at each pole of the main winding is such that, as shown in FIG. 4, the voltage value Va of the main winding 36a corresponding to the narrow gap g1 increases, and the wide gap g2 , The voltage value Vc of the main winding 36c becomes lower.

As described above, while measuring the voltage value of each main winding while the electric motor is rotating, the adjustment piece 43 having a low voltage value, that is, the adjustment piece 43 located on the side with a wide gap is bent outward, whereby the stator 34 is rotated. Is moved inward so as to adjust until each voltage value is substantially the same. Thereby, the gap g between the rotor 32 and the stator 34 becomes uniform along the circumference, and noise and vibration of the electric motor can be suppressed to the lowest level.

As described above, in the first embodiment, the voltage value is measured on the main winding. However, the voltage value of each pole of the auxiliary winding is measured, and the axis is adjusted based on the measured voltage value. It may be.

Embodiment 2 of the Invention Embodiment 2 of the present invention will be described with reference to the drawings.

FIG. 5 shows an axial sectional view of a single-phase induction motor according to Embodiment 2 of the present invention. FIG. 6 shows a radial cross-sectional view of a single-phase induction motor according to Embodiment 2 of the present invention. FIG. 7 is an exploded perspective view of the stator of the single-phase induction motor shown in FIG. FIG. 8 is a circuit diagram illustrating connection between a stator winding and a voltage measuring device of a single-phase induction motor according to Embodiment 2 of the present invention.

A description of structurally the same parts as in the first embodiment of the present invention is omitted.

As shown in FIG. 7, the stator 34 is made of a resin-made ring-shaped relay terminal mounting member 80, and is made of resin for fitting and fixing the relay terminal mounting member.
2a, an inner core 82 having a winding portion 82c around which the main winding 36 and the auxiliary winding 38 are wound, and a ring-shaped outer core 84 for fitting and fixing the outer diameter of the inner core 82. Be composed.

The relay terminal mounting member 80 has three relay terminals a1 to a3,
1 to b3, c1 to c3, and d1 to d3.

Main winding 36 and auxiliary winding 3 of stator 34
Numeral 8 is wound around the relay terminal between the poles of the respective windings, and wired so that the voltage of the windings of each pole can be measured.

Actually, the relay terminals do not use all three terminals, but are provided to eliminate the directivity and to share them.

At the end of the frame 40, there is provided a claw-shaped stator moving adjusting piece 43 capable of accommodating the end of the bracket 42. The stator moving adjusting piece 43 includes:
It is arranged at a position facing each winding, that is, at eight positions in FIG.

The terminal box 90 has a main external terminal block 91 to which a plurality of lead wires from each of the relay terminals of the main winding are connected, and a plurality of lead wires from each of the relay terminals of the auxiliary winding. An auxiliary external terminal block 93 is provided.

A method of adjusting the axial center of the rotor of the electric motor configured as described above will be described with reference to FIGS.

FIG. 8 shows that the main winding and the auxiliary winding of the electric motor according to the second embodiment of the present invention are connected to a power supply 69 and a voltage measuring device 70 by a main external terminal block 91 and an auxiliary external terminal block 93. FIG. FIG. 9 is a curve diagram showing the relationship between the winding voltage and the amount of eccentricity of the rotor shaft center when driven by the circuit in FIG.

When the switch 67 is turned on, the AC power 69
Then, a current flows through the main winding 36 of the electric motor through the A1 and A2 of the main external terminal block 91 and the auxiliary winding 38 through the capacitor 75, and the rotor 32 rotates.

In the rotating state of the motor, the input terminals I1 and I2 of the voltage measuring device 70 are connected to the A2
-D1, D1-C1, C1-B1, and B1-A1 are connected in order to connect the voltage values Vma, 36b of the main winding 36a.
, The voltage value Vmc of 36c, and the voltage value Vmd of 36d are measured.

Similarly, D3-D2 of the auxiliary external terminal 93
, D2-C3, C3-B2, and B2-A3 are connected in that order, and the voltage value Vsa of the auxiliary winding 38a, the voltage value Vsb of the 38b, the voltage value Vsc of the 38c, and the voltage value Vsc of the 38d.
sd is measured respectively.

Then, these measured voltage values are compared.

If the axes of the rotor 32 and the stator 34 coincide with each other, that is, if the gap g is constant over the entire circumference, the measured voltage values Vma to Vmd and Vsa to Vsd
Have the same value, and it is not necessary to adjust the gap g.

However, as shown in FIG. 6, if the axis of the rotor 32 is shifted to the right from the stator center O point,
The right gap g1 is narrow, the gap g4 is slightly narrow, the left gap g2 is wide, and the gap g3 is slightly wide.

The magnetic flux generated from the main winding 36d on the narrow gap side flows to the rotor 32, and the magnetic flux density increases as the rotor 32 approaches. Conversely, the main winding 3 on the wide gap side
6b flows to the rotor 32 and the rotor 32
Distant, the magnetic flux density decreases.

Therefore, as shown in FIG. 9, the voltage value Vmd of the main winding 36d corresponding to the gap g1 is increased with reference to the uniform gap g, and the auxiliary winding 38c corresponding to the gap g4 is set.
Is slightly higher, the voltage value Vmb of the main winding 36b corresponding to the gap g2 is lower, and the voltage value Vsa of the auxiliary winding 38a corresponding to the gap g3 is slightly lower.

As described above, while measuring the voltage value of each pole of each of the main winding and the auxiliary winding while the motor is rotating, the adjustment piece 43 having a low voltage value, that is, the adjustment piece 43 on the wide side of the gap is moved outward. By bending, the stator 34 is moved so as to be pushed inward, and the adjustment is performed until the respective voltage values become substantially the same. Thereby, the gap g between the rotor 32 and the stator 34 becomes uniform along the circumference, and noise and vibration of the electric motor can be suppressed to the lowest level.

In the above embodiment, the stator moving device for adjusting the gap g has been described as being formed by the claw-shaped adjusting piece provided at the end of the frame 40. However, the bolt 45 as shown in FIG. And bracket 42
May be screwed to the side surface of the, and the stator may be moved by the bolt 45.

The stator moving devices are shown in the figure as four locations in the first embodiment and eight locations in the second embodiment. However, the number is not limited to this, and the number of teeth of the stator is not limited. The number may be increased to the same number.

When the number of the stator moving devices is limited, the arrangement of the stator moving devices is set in accordance with the positions of the teeth of the stator 34 in the circumferential direction. Alternatively, it may be installed in a position facing the center of the main winding and the auxiliary winding.

[0059]

According to the motor of the present invention, a plurality of terminals for measuring a voltage between a plurality of coils forming a winding of a stator and a radial position with respect to an axis of the stator are moved. A stator moving mechanism capable of moving the stator so as to make the voltage value uniform can make the air gap between the stator and the rotor uniform, and the motor with low noise and vibration can be used. can get.

Further, since the plurality of terminals include a plurality of relay terminals provided in the case of the electric motor and are connected to external connection terminals provided on the outer wall of the case of the electric motor, voltage from the outside can be increased. A measuring instrument can be easily connected.

[0061] Further, a relay terminal support member for supporting the relay terminal is provided, and the relay terminal support member is wound on the iron core of the stator and winds the main winding and the auxiliary winding. The main winding and the auxiliary winding can be easily insulated from the iron core of the stator.

The relay terminals each have three terminals and are arranged between the main windings, so that the space between the main windings can be effectively utilized.

The case is divided into two parts in the axial direction,
The stator moving mechanism includes a claw-shaped piece formed at one end of the divided case, and moves the stator by bending the claw-shaped piece, so that the stator can be easily moved. be able to.

The case is divided into two parts in the axial direction,
Since the stator moving mechanism moves the stator by the bolts screwed to the end side surfaces of the divided case, the stator can be easily moved.

[Brief description of the drawings]

FIG. 1 is an axial sectional view of a single-phase induction motor according to a first embodiment of the present invention.

FIG. 2 is a radial cross-sectional view of the single-phase induction motor according to the first embodiment of the present invention.

FIG. 3 is a circuit diagram illustrating connection between a stator coil and a voltage measuring device of the single-phase induction motor according to the first embodiment of the present invention.

FIG. 4 is a curve diagram showing a relationship between a coil voltage and an eccentric amount of a rotor shaft center.

FIG. 5 is an axial sectional view of a single-phase induction motor according to a second embodiment of the present invention.

FIG. 6 is a radial sectional view of a single-phase induction motor according to a second embodiment of the present invention.

7 is an exploded perspective view of a stator of the single-phase induction motor shown in FIG.

FIG. 8 is a circuit diagram illustrating connection between a stator coil and a voltage measuring device of the single-phase induction motor according to the second embodiment of the present invention.

FIG. 9 is a curve diagram showing a relationship between a coil voltage and an eccentric amount of a rotor shaft center.

FIG. 10 is an axial sectional view of a single-phase induction motor according to another embodiment of the present invention.

FIG. 11 is an explanatory view of a conventional motor center adjustment method.

[Explanation of symbols]

31 axis, 32 rotor, 34 stator, 36
Main winding, 38 auxiliary winding, 40 frames, 4
2 Bracket, 43 Stator moving adjustment piece, 45
Bolt 69 AC power supply, 70 Voltage measuring instrument, 80 Relay terminal mounting member, 82 Internal iron core, 84 External iron core, 90 Terminal box, 91 Main external terminal, 93
Auxiliary external terminal

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 15/16 H02K 11/00 J (72) Inventor Ryoichi Kimura 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Corporation (72) Inventor Yuji Nakahara 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation (72) Inventor Kazuyuki Yamamoto 2-3-2 Marunouchi, Chiyoda-ku, Tokyo 3 Ryo Electric Co., Ltd. (72) Inventor Yoshio Yoshikuwa 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 5H603 AA09 AA10 BB01 BB06 BB12 CA01 CB04 CB12 CB18 CB26 CC03 CC17 CE01 FA16 5H604 AA08 BB01 BB09 BB14 CC01 CC05 CC13 DB01 PB03 QA08 QB03 QB14 5H605 AA08 BB05 BB10 CC01 CC02 CC06 EC08 EC11 FF06 GG06 5H611 AA01 BB01 BB05 PP02 QQ06 UA02 5H615 AA0 1 BB01 BB06 BB14 PP01 PP02 PP07 PP08 PP14 PP15 PP21 PP28 QQ02 RR01 SS04 SS20 SS46 SS55 SS57 TT26

Claims (11)

[Claims] 1. A plurality of terminals for measuring a voltage between a plurality of windings forming a winding of a stator, and a stator moving device capable of moving a radial position with respect to an axis of the stator. An electric motor comprising: 2. The electric motor according to claim 1, wherein the plurality of terminals include external connection terminals provided on an outer wall of a case of the electric motor. 3. The electric motor according to claim 2, wherein the plurality of terminals include a plurality of relay terminals connected to the external connection terminal and provided in a case of the electric motor. 4. A relay terminal supporting member for supporting the relay terminal, wherein the winding comprises a plurality of main windings and a plurality of auxiliary windings, wherein the relay terminal supporting member is superposed on an iron core of the stator. 4. The electric motor according to claim 3, further comprising a winding portion configured to wind the main winding and the auxiliary winding. 5. The electric motor according to claim 4, wherein each of said relay terminals has three terminals and is disposed between said main windings. 6. The case is divided into two parts in the axial direction, and the stator moving mechanism comprises a claw-shaped piece formed at one end of the divided case. The electric motor according to any one of claims 1 to 5, wherein the stator is moved. 7. The case is divided into two parts in the axial direction, and the stator moving mechanism moves the stator by bolts screwed to end side surfaces of the divided case. The electric motor according to claim 1. 8. The electric motor according to claim 6, wherein the stator moving mechanism is provided in accordance with a position of a tooth portion of the stator. 9. The electric motor according to claim 6, wherein the number of said stator moving mechanisms is equal to the number of teeth of said stator. 10. The electric motor according to claim 6, wherein said stator moving mechanism is provided at a position facing a central portion of said main winding and said auxiliary winding. 11. A motor for measuring the voltage of each of a plurality of windings forming a winding of a stator of a motor, and using a stator moving device to adjust the voltage of each winding of the stator of the motor so that the voltage of each winding is uniform. A method for adjusting a shaft center of an electric motor, comprising adjusting a position.