JP2002044905A - Electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric motor which can prevent electromagnetic to effect adversely from extending to an encoder, relating to the electric motor used, for example, as a drive source for hoisting and lowering in a three- dimensional auto park. SOLUTION: In the electric motor comprising a terminal box 7, which accommodates connection terminals connected to cables 8 for supplying power to a drive output part 5 and includes a cable lead-out ports 7c for extracting cables 8 to external, the encoder 2 which detects rotating speed of a rotational drive shaft 4, and an encoder cover 10 which covers the encoder 2 and has a cable lead-out ports 10a for lead out cables 9 connected to the encoder 2 to the outside, locations of the cable lead-out ports 10a for the encoder cover 10 are made variable in the peripheral direction and locations of the cable lead-out ports 7c for the terminal box 7 are made variable in the peripheral direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor, and more particularly, to a motor having a terminal box containing a connection terminal for supplying electric power for drive control of a rotary drive shaft, and an encoder for detecting the rotational speed of the rotary drive shaft. Related to electric motors.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional electric motor, which is a reduction motor for raising and lowering a multi-story parking garage having a reduction mechanism. In FIG. 5, the reduction motor includes a fully-closed outer fan-shaped motor 101, an encoder 102, and a reduction mechanism 103.
It has. The motor 101 is supplied with power from the cable 104 via the terminal box 105, and rotationally drives a rotary drive shaft (not shown). The motor 101 has a brake unit 106 in which an electromagnetic brake (not shown) is housed. The brake unit 106 is also supplied with power from a cable 104 via a terminal box 105.

The encoder 102 is connected to the rotation drive shaft of the motor 101 via a coupling (not shown), detects the number of rotations of the rotation drive shaft of the motor 101, and outputs the detection result to the outside via a cable 106. This is used for speed control of the motor 101 and the like. The rotary drive shaft of the motor 101 is connected to an input shaft (not shown) of the speed reduction mechanism 103, and reduces the rotation of the rotary drive shaft to drive a load (not shown) by the rotation output of the output rotary shaft 107. Reference numeral 108 denotes an opening, which functions as a window for checking the rotation state of the encoder 102.

[0004]

However, in such a conventional electric motor, the direction in which the cable 104 for supplying power to the motor 101 is unconditionally determined by the shape of the terminal box 105, Since the direction in which the cable 106 is taken out is uniquely determined, depending on the combination of these directions, adverse effects such as noise on the encoder 102 due to the power supply cable 104 are likely to occur, and the detection accuracy of the encoder 102 is reduced. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. The present invention has been made in view of the above-mentioned circumstances by making the cable take-out direction from the terminal box and the cable take-out direction for the encoder variable. It is an object of the present invention to enable an optimal combination and prevent electromagnetic adverse effects on an encoder.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a drive output unit having a rotary drive shaft, the drive output unit driving the rotary drive shaft by power supply, and power supply to the drive output unit. A terminal box having a cable outlet for accommodating the connection terminal connected to the cable, and having a cable outlet for drawing the cable to the outside, an encoder for detecting the number of revolutions of the rotary drive shaft, and an encoder that covers the encoder, An encoder cover having a cable outlet for drawing out a connected cable to the outside, wherein the position of the cable outlet of the encoder cover is variable in the circumferential direction of the encoder cover, and the cable outlet of the terminal box is provided. Is variable in the direction of the periphery of the terminal box.

The drive output section includes a motor section that applies a driving force to the rotary drive shaft, and an electromagnetic brake section that brakes the rotary drive shaft, and the power output section supplies power to the drive output section. The cable may be used for power supply to the motor unit and the electromagnetic brake unit.

The position of the cable outlet of the encoder cover may be made variable by providing a plurality of openings in the encoder cover in advance and selectively using the opening as an outlet.

[0009] The position of the cable outlet of the encoder cover may be made variable by making the arrangement direction of the encoder cover itself selectable.

The position of the cable outlet of the terminal box may be variable by providing a plurality of openings in the terminal box in advance and selectively using the opening as an outlet.

Further, the position of the cable outlet of the terminal box may be made variable by making it possible to select the arrangement direction of the terminal box itself.

The encoder cover may have a closed structure.

Further, the terminal box may have a sealed structure.

Further, the motor may be a reduction motor having a reduction mechanism for reducing the rotation of the rotary drive shaft and outputting the rotation.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the structure of a motor according to the present invention will be described with reference to the embodiments shown in FIGS. The motor shown in FIG. 1 is an example of a reduction motor, and the motor includes a drive output unit 1, an encoder 2, and a reduction mechanism unit 3. The drive output unit 1 has a rotary drive shaft 4 and drives the rotary drive shaft 4 by supplying power. Specifically, the drive output unit 1 includes a motor unit 5 that applies a driving force to the rotary drive shaft 4 and an electromagnetic brake unit 6 that brakes the rotary drive shaft 4.
And

A terminal box 7 is detachably attached to an outer frame 5a of the motor unit 5 by bolts 7d.
Has a box frame 7a and a box cover 7b. The terminal box 7 houses a connection terminal (not shown) connected to a cable 8 for supplying power to the drive output unit 1 and has a cable outlet 7c for drawing the cable 8 to the outside.

The encoder 2 detects the rotation speed and the number of rotations of the detection shaft 4a at one end of the rotary drive shaft 4.
Power supply to the encoder 2 and output of a detection signal from the encoder 2 are performed via a cable 9. The encoder 2 is covered by an encoder cover 10,
The encoder cover 10 is attached to the brake cover 6a of the brake unit 6, and has a cable outlet 10a for drawing out the cable 9 to the outside.

The reduction mechanism 3 reduces the rotation of the rotary drive shaft 4 by a gear mechanism (not shown) connected to the rotary drive shaft 4 and outputs the reduced rotation to a rotary load (not shown) via the output shaft 3a. The speed reduction mechanism 3 is formed with a leg 3b for attaching an electric motor.

FIGS. 2A, 2B and 2C are diagrams showing three examples of the terminal box 7 in the direction of arrow A in FIG.
(A) is an example in which the terminal box 7 has one cable outlet 7c. In this case, by removing the bolt 7d in FIG. 1, the position shown in FIG. 2A can be changed to, for example, a position rotated 90 degrees, 180 degrees, or 270 degrees clockwise. Therefore, the opening direction of the cable outlet 7c can be selected in four directions, and as a result, the direction in which the cable 8 is pulled out is variable in the circumferential direction of the terminal box 7.

FIG. 2 (b) shows an example in which the terminal box 7 has three cable outlets 7c which open in different directions, respectively. FIG. 2 (c) shows that the terminal boxes 7 are different from each other. Cable outlets 7c that open in two directions
Is shown. These FIG. 2 (b),
In the example shown in (c), the terminal box 7 does not need to be removed and rotated, and the cable 8 can be pulled out in the circumferential direction of the terminal box 7 simply by passing the cable 8 through another cable outlet 7c. Can be

In the above embodiment, the terminal box 7 has a rectangular cross section in the circumferential direction. However, the present invention is not limited to this cross sectional shape.
Any cross-sectional shape may be used.

FIGS. 3A and 3B are diagrams showing two examples of the encoder cover 10 as viewed in the direction of arrow B in FIG.
First, FIG. 3A shows two cable outlets 10a in which the encoder cover 10 opens in different directions.
In this example, the cable 9 can be pulled out in the circumferential direction of the terminal box 7 simply by passing the cable 9 through another cable outlet 10a.

FIG. 3B shows an example in which the encoder cover 10 has one cable outlet 10a. In this case, by removing attachment means such as bolts (not shown), the position shown in FIG.
Degrees, 180 degrees, 270 degrees. Therefore, the opening direction of the cable outlet 10a can be selected in four directions, and as a result, the cable 9
Is variable in the circumferential direction of the encoder cover 10.

In the above embodiment, the circumferential cross section of the encoder cover 10 is rectangular. However, the present invention is not limited to this cross sectional shape. It may have a cross-sectional shape.

When the electric motor as described above is used, for example, as a geared motor for driving up and down a multilevel parking garage, a power supply cable 8 for the motor unit 5 and the electromagnetic brake unit 6 is used.
The electromagnetic noise of the motor, noise generated when the brake is turned on / off, and the like generated in the vicinity thereof may cause noise in the cable 9 of the encoder 2 itself, which may have an adverse effect. Also, the cable 9 of the encoder 2 may be adversely affected by a power source such as an electric light arranged near the encoder. In the case where such noise is a problem, in the present embodiment, the direction in which the cable 9 of the encoder 2 is pulled out can be changed, so that the electromagnetic adverse effect on the encoder 2 can be easily reduced.

Further, since the power supply cable 8 has a large influence on the motor unit 5 and the electromagnetic brake unit 6, if the drawing direction of the cable 8 can be changed as in this embodiment, the encoder 2 By combining this with a change in the direction in which the cable 9 is pulled out, the adverse electromagnetic effect on the encoder 2 can be further drastically changed.

Further, particularly when the encoder 2 is disposed near the electromagnetic brake section 6, the influence from the electromagnetic brake section 6 is large, so that the cable pull-out direction is made variable as in the present embodiment. This is particularly effective because the influence can be reduced.

Further, as shown in FIGS. 2A and 3B, only one cable outlet 7c, 10a is provided, and the terminal box 7 and the encoder cover 10 are mounted in a desired direction. In this case, since there is no unused cable outlet, dust can be prevented from entering, and there is an effect that a blind cover or the like for the unused cable outlet is not required.

Further, as shown in FIGS. 2 (b), 2 (c) and 3 (a), cable outlets 7c, 10c
In the case where a plurality of “a” are provided and these outlets are selectively used, it is not necessary to change the arrangement direction of the terminal box 7 and the encoder cover 10 and the like.
The cable pull-out direction can be easily changed.

In the electric motor shown in FIGS. 1 to 3 described above, the terminal box 7 and the encoder cover 10 are not sealed, but can be sealed using a sealing plug 21 as shown in FIG. . As the sealing plug 21,
For example, a plastic cable gland of the skin top series of LAPP KABEL can be used.

In FIG. 4, the sealing plug 21 is attached to the through hole 22c of the box-shaped member 22 composed of the lower cover member 22a and the upper cover member 22b, and has a structure in which the cable is passed while maintaining the airtightness. . The lower cover member 22a and the upper cover member 22b are
The packing 22 d and the plug 21 are sealed by a bolt 23 through the box-shaped member 2.
2 can have a closed structure. Instead of the terminal box 7 and the encoder cover 10 shown in FIGS. 1 to 3, a box-shaped member 22 and a sealing plug 21 shown in FIG. 4 may be used.

Alternatively, a seal structure such as packing is added to the terminal box 7 and the encoder cover 10 shown in FIGS.
The sealing plug 21 may be attached to the outlets 7c and 10a to allow the cables 8 and 9 to pass therethrough. When the terminal box 7 and the encoder cover 10 shown in FIGS. 1 to 3 have a sealed structure as described above, a sealable blind plug (not shown) is attached to the drawer ports 7c and 10a which are not used for drawing out the cables 8 and 9. To do.

In general, when the electric motor is used indoors, for example, when used as a drive source for raising and lowering a multistory parking garage placed indoors, it is not necessary to make the terminal box 7 and the encoder part a closed structure. Conversely, when the electric motor is used as a drive source for driving up and down the outdoor multilevel parking lot, the terminal box 7
It is necessary to make the encoder and the encoder part a sealed structure. Therefore, whether or not the sealing structure is used may be appropriately selected depending on the use. Even in the electric motor of the present embodiment originally intended for indoor use, the above-described sealing plug 21 and packing are used for outdoor use. For electric motors.

In the above-described embodiment shown in FIGS. 1 to 3, an opening window for confirming the operation of the encoder 2 may be formed in the encoder cover 10.

When the above-mentioned electric motor is used as a drive source for elevating and lowering a multistory parking garage, for example, when the distance between the electric motor and a supporting member to which the electric motor is attached is short, FIG.
In some cases, the cable 9 cannot be pulled out in the direction shown in FIG.
It is preferable to pull out in the direction shown in FIG.

Further, as shown in FIG. 1 and FIG. 3, since the cable 9 is pulled out perpendicular to the rotary drive shaft 4, a member close to the encoder cover 10 in the axial direction of the rotary drive shaft 4, for example, a three-dimensional member The distance from the wall of the parking lot can be shortened, and the space occupied by equipment or the like incorporating a motor can be made more compact.

[0037]

According to the present invention, the position of the cable outlet of the encoder cover is made variable around the encoder cover, and the position of the cable outlet of the terminal box is made variable around the terminal box. Because
It is possible to arbitrarily change the combination of the pull-out direction of the encoder cable and the pull-out direction of the power supply cable of the drive output unit, which is one of the major factors that determine the degree of the effect of noise on the encoder. An adverse effect can be prevented, and as a result, the detection accuracy of the encoder can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a motor according to the present invention.

FIG. 2 is a cross-sectional view of the terminal box taken along arrow A in FIG.

FIG. 3 is a plan view showing the encoder cover as viewed from an arrow B in FIG. 1;

FIG. 4 is a view showing a box-shaped member and a sealing plug corresponding to the terminal box and the encoder cover shown in FIG. 1;

FIG. 5 is a perspective view showing a conventional electric motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive output part 2 Encoder 3 Reduction mechanism part 4 Rotation drive shaft 5 Motor part 6 Electromagnetic brake part 7 Terminal box 7c Cable outlet 8 Cable 9 Cable 10 Encoder cover 10a Cable outlet 21 Sealing plug

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) RR01 TT01 UA04 UA08

Claims (9)

[Claims] A drive output unit having a rotary drive shaft for driving the rotary drive shaft by electric power supply, and a connection terminal connected to a cable for supplying power to the drive output unit, wherein the cable is housed. Terminal box having a cable lead-out port for drawing the cable to the outside, an encoder for detecting the number of rotations of the rotary drive shaft, and an encoder cover having a cable lead-out port for covering the encoder and drawing out a cable connected to the encoder to the outside Wherein the position of the cable outlet of the encoder cover is variable in the peripheral direction of the encoder cover, and the position of the cable outlet of the terminal box is variable in the peripheral direction of the terminal box. Characterized electric motor. 2. The drive output unit includes: a motor unit that applies a driving force to the rotary drive shaft; and an electromagnetic brake unit that brakes the rotary drive shaft. The drive output unit supplies power to the drive output unit. The electric motor according to claim 1, wherein a cable is used to supply power to the motor unit and the electromagnetic brake unit. 3. The position of the cable outlet of the encoder cover is determined by providing a plurality of openings in the encoder cover in advance and selectively using the opening as an outlet.
3. The electric motor according to claim 1, wherein the electric motor is variable. 4. The electric motor according to claim 1, wherein the position of the cable outlet of the encoder cover is made variable by making it possible to select an arrangement direction of the encoder cover itself. 5. The terminal box according to claim 1, wherein the position of the cable outlet is variable by providing a plurality of openings in the terminal box in advance and selectively using them as outlets. 4. The electric motor according to any one of 4. 6. The terminal box according to claim 1, wherein the position of the cable outlet of the terminal box is variable by making it possible to select an arrangement direction of the terminal box itself. An electric motor as described. 7. The electric motor according to claim 1, wherein the encoder cover has a closed structure. 8. The electric motor according to claim 1, wherein the terminal box has a sealed structure. 9. The electric motor according to claim 1, wherein the electric motor is a reduction motor having a reduction mechanism for reducing and outputting the rotation of the rotary drive shaft.