JP2004135474A - Motor equipped with revolution detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor equipped with a revolution detector wherein an internal fan can be fixed with reliability at a low cost. <P>SOLUTION: In the motor equipped with a revolution detector, an enclosed space is formed by an anti-load-side bracket 7, a heat insulation plate 6, and a detector cover 9. The motor comprises a detector rotating portion 1 which is fit and fixed to a rotating shaft 2 protruded into the space from the anti-load-side bracket 7, and a detector fixed portion 3 which is supported to the rotating shaft 2 by a bearing 4 and whose displacement in the direction of revolution is limited. The integral press internal fan has a plurality of elastic claws on the rim of a center hole and a guide inclined toward the direction of being fitted to the rotating shaft. The internal fan is fitted to the rotating shaft in the space between the anti-load-side bracket 7 and the detector fixed portion 3, and is fitted by a single touch. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
[Industrial applications]
The present invention relates to an electric motor having a rotation detector coupled to a rotation shaft, and more particularly to an internal fan provided to reduce a rise in temperature of the rotation detector.
[0002]
[Prior art]
Conventionally, when a rotation detector that detects a rotation speed and a rotation angle is coupled to a rotation shaft of a motor, heat generated by heat loss of the motor is transmitted from the rotation shaft of the motor to a rotating part of the rotation detector, and the rotation of the rotation detector is detected. Insert a heat insulating plate between the non-load side bracket of the motor and the detector cover to prevent damage and shorten the life of the electronic components that make up a part of the motor. In addition, an internal fan fitted and fixed to the rotating shaft is arranged to reduce heat generation (see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-8-205480 (FIG. 2)
[0004]
[Problems to be solved by the invention]
However, such a conventional technique has the following problems.
(1) When the fan fitted and fixed between the non-load-side bracket and the detector fixing portion is arranged, there are fixing by bonding, fixing by press-fitting with a key, fixing with a set screw, and the like. In these fixings, the inner fan may rattle or fall due to variations in adhesion, variations in press-fitting, and variations in bolt tightening torque.
(2) Adhesives, bolts, keys and the like used for fixing the internal fan are required, which increases the number of assembly steps and costs.
An object of the present invention is to provide an electric motor having a rotation detector that can securely fix an internal fan at low cost.
[0005]
[Means for Solving the Problems]
In order to solve the above problem, the present invention is to form a closed space by an anti-load side bracket, a heat insulating plate fixed to the anti-load side bracket, and a detector cover fixed to the heat insulating plate, In this space, a detector rotating portion fitted and fixed to a rotating shaft protruding from the anti-load side bracket, and a detector fixed supported on the rotating shaft via a bearing and having a limited displacement in a rotating direction. And a rotation detector having a plurality of elastic claws on a periphery of a center hole in a space between the non-load-side bracket and the detector fixing part, and a direction of insertion into a rotation shaft. An integrated press internal fan having a guide portion inclined to the side is inserted into the rotary shaft and fixedly attached with one touch.
[0006]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side sectional view of a main part of a motor having a rotary detector according to an embodiment of the present invention.
In FIG. 1, reference numeral 1 denotes a detector rotating unit fitted and fixed to the opposite end of the rotating shaft 2 on the non-load side, and is formed of a slit disk. Reference numeral 3 denotes a detector fixing portion, which is supported on the rotating shaft 2 via a bearing 4, and fixes the light emitting element and the light receiving element so as to sandwich the detector rotating portion via a gap. Reference numeral 5 denotes an electronic component, which is attached to the detector fixing unit 3. Reference numeral 6 denotes a heat insulating plate which is fixed to the non-load-side bracket 7 and is attached via a mounting plate 8 such as a leaf spring so as not to be displaced in the rotational direction. Reference numeral 9 denotes a detector cover which is attached to the heat insulating plate 6. Reference numeral 10 denotes an integral press internal fan fan disposed between the non-load-side bracket 7 and the detector fixing portion 3 and fitted and fixed to the rotating shaft 2.
FIG. 2 is a front view showing the integrated press inner fan of FIG.
In FIG. 2, the integral press internal fan 10 has a central hole 10a at the center and is formed by a fan 10b, an elastic claw 10c, and a guide 10d.
When the integral press inner fan 10 having such a configuration is fixed to the rotating shaft 2, it may be simply inserted into the rotating shaft 2 as shown in FIGS. 3 (a) and 3 (b). When the integral press inner fan 10 is inserted into the rotating shaft 2, the elastic claw 10c falls to the opposite side of the insertion while generating a resilient force. Since the guide portion 10d is inclined in the insertion direction in advance, the integral press inner fan 10 is supported by the elastic claw portion 10c and the guide 10d, and the rotary shaft 2 has a step for preventing tilting and positioning. Even if it does not, it is securely and easily fitted and fixed at a predetermined position of the rotating shaft 2 without falling down or tilting.
[0007]
【The invention's effect】
As described above, the present invention has the following effects.
(1) Since the inner fan is formed by a press by integrating the fan portion, the elastic claw portion, and the guide portion, the number of parts is reduced, the manufacturing is simple, and the cost can be reduced.
(2) Since the integrated press internal fan has the guide portion, it does not warp or fall when inserted into the rotating shaft, thereby improving workability. In addition, there is no need for a positioning step for preventing warping and falling, and the processing cost of the rotating shaft can be reduced.
(3) The internal fan inside the press can be arranged with a single touch, the work in the conventional fixing method does not vary, and a stable fit and fixation can be obtained.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a main part of an electric motor having a rotary detector according to an embodiment of the present invention.
FIG. 2 is a front view showing the integrated press inner fan shown in FIG. 1;
FIGS. 3A and 3B are diagrams showing fitting and installation of the integral press inner fan to the rotating shaft, wherein FIG. 3A shows a state before fitting and mounting, and FIG. 3B shows a state after fitting and mounting; .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Detector rotating part 2 Rotating shaft 3 Detector fixing part 4 Bearing 5 Electronic component 6 Heat insulating plate 7 Non-load side bracket 8 Mounting plate 9 Detector cover 10 Integrated press inner fan 10a Central hole 10b Fan 10c Elastic claws Part 10d Guide part

Claims (1)

An anti-load side bracket, a heat insulating plate fixed to the anti-load side bracket, and a detector cover fixed to the heat insulating plate form a hermetically sealed space. An electric motor including a rotation detector having a detector rotation unit fitted and fixed to a protruding rotation shaft, and a detector fixing unit supported by the rotation shaft via a bearing and having a limited displacement in the rotation direction. At
In the space between the non-load side bracket and the detector fixing part,
An integrated press inner fan that can be fixed with one touch by inserting it into the rotating shaft is arranged,
An electric motor equipped with a rotation detector, wherein the integral press inner fan has a plurality of elastic claws and a guide inclined toward the direction of insertion into the rotating shaft on the periphery of the center hole.

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