JPH0644380U - Motor with rotary encoder - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a motor with a rotary encoder that can be further shortened in length and can be manufactured with a reduced number of parts to reduce the manufacturing cost. An opening 24 is provided at a predetermined position of a bearing bracket 20 that supports a rotating shaft 18 of a motor 10.
A light emitting element 28 or a light receiving element 36 is arranged at 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a motor with a rotary encoder, and more particularly to a motor with a rotary encoder directly coupled to a motor without a separate bearing for a rotary encoder.

[0002]

[Prior art]

 A motor directly connected to a motor with a rotary encoder is known, for example, from Japanese Utility Model Laid-Open No. 3-34656.

In this conventional example, an encoder mounting base supporting a light receiving element is fixed to an outer surface of a bearing bracket supporting one of a pair of bearings for a rotating shaft of a motor, and the light emitting element is It is supported by the circuit board so as to face the light receiving element outside of one bearing bracket. A rotary cord plate, which is concentrically fixed to the rotary shaft outside the one bearing bracket, is interposed in the gap between the light emitting element and the light receiving element.

The motor directly connected to the rotary encoder with the above-described structure can be shortened in the direction along the rotation axis because it does not have an independent bearing for the rotary encoder, and the number of parts is small and the manufacturing cost is low. .

[0005]

[Problems to be solved by the device]

 However, even with this conventional motor with a direct-coupled rotary encoder, it is required to further shorten the length, reduce the number of parts, and reduce the manufacturing cost.

The present invention has been made under the above circumstances, and an object of the present invention is to provide a motor with a rotary encoder, which can further reduce the length and the number of parts and can reduce the manufacturing cost. Is.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, a motor with a rotary encoder according to the present invention is provided with an opening at a predetermined position of a bearing bracket that supports a rotating shaft of a motor, and a light emitting element or a light receiving element is arranged in this opening. It is characterized by

[0008]

[Action]

 In the motor with a rotary encoder according to the present invention, which is configured as described above, an opening is provided at a predetermined position of a bearing bracket that supports a rotating shaft of the motor, and the light emitting element or the light receiving element is provided in this opening. This eliminates the need for an encoder mounting base protruding from the outer surface of the motor bearing bracket.

[0009]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. 1 in the accompanying drawings.

The motor 10 has a cylindrical motor housing 14 in which a stator 12 is arranged on an inner surface of a peripheral wall, and extends in an inner space of the motor housing 14 along a longitudinal centerline of the motor housing 14. A bearing bracket 20 (see FIG. 1) is provided with a rotary shaft 18 to which a rotor 16 facing the stator 12 in the inner space is concentrically fixed, and the longitudinal openings of the motor housing 14 are closed. , Only one of which is on the base end side of the rotary shaft 18 is shown.) The rotary shaft 18 is rotatably supported on both outer sides of the rotor 16 by a bearing 22 supported at the center.

The bearing bracket 20 on the base end side of the rotary shaft 18 is formed with a through hole 24 extending radially outward of the bearing 22 along the rotation center line of the rotary shaft 18.

An opening of the through hole 24 on the outer side surface of the bearing bracket 20 is covered with a fixed code plate 26, and a light emitting element 28 such as a light emitting diode is inserted from the opening of the through hole 24 on the inner side surface of the bearing bracket 20. Has been done.

A rotary cord plate 32 is concentrically fixed to a base end portion of the rotary shaft 18 projecting outward from the bearing bracket 20 via a hub 30 so as to rotate opposite to the light emitting element 28. A large number of slits of the same size and shape are formed in the annular region of the code plate 32 at predetermined intervals in the circumferential direction.

In the direction along the longitudinal centerline of the rotary shaft 18 and outwardly of the base end outward projecting end, the support bracket (not shown) is provided on the outer surface of the bearing bracket 20 so as to be substantially parallel to the outer surface. A circuit board 34 is supported, and a light receiving element such as a photodiode is provided at a position on the circuit board 34 facing the light emitting element 28 in the through hole 24 on the outer surface of the bearing bracket 20 with the rotary cord plate 32 interposed therebetween. 36 is fixed.

On the circuit board 34, the light from the light emitting element 28 pulsed by passing through a large number of slits of the rotary code plate 32 rotating with the rotary shaft 18 of the motor 10 is received per unit time. An encoder circuit is configured to generate an encoder signal based on the number of light pulses received by 36.

The outer diameters of the circuit board 34 and the rotary cord plate 32 are smaller than the outer diameter of the motor housing 14, respectively. It is covered with a cylindrical cap-shaped encoder cover 38 that is detachably fixed to the outer peripheral edge of the side surface.

After the wiring from the light emitting element 28 is drawn to the outer surface of the bearing bracket 20 through a notch (not shown) formed in the outer peripheral surface of the bearing bracket 20 or another through hole (not shown). It is connected to the circuit board 34.

In the motor with a rotary encoder of one embodiment configured as described above, the light emitting element 28 also emits light at the same time when the rotating shaft 18 of the motor 10 rotates, and the light receiving element 36 rotates together with the rotating shaft 18. It receives the pulsed light from the light emitting element 28 that passes through many slits of the rotary code plate 32. The encoder circuit on the circuit board 34 generates an encoder signal corresponding to the number of light pulses received by the light receiving element 36 per unit time. It is well known that the rotation speed and rotation angle of the rotary shaft 18 can be measured based on this signal. FIG. 2A shows a first modification of the rotary encoder-equipped motor of the above-described embodiment.

In this modification, an insulating sleeve 40 made of an insulating material is attached to the base end portion of the light emitting element 28, and the light emitting element 28 is mounted on the bearing bracket 20 with the insulating sleeve 40 interposed. It is press-fitted into the through hole 24 from the opening of the through hole 24 on the inner surface.

The insulating sleeve 40 ensures electrical insulation between the inner peripheral surface of the through hole 24 of the bearing bracket 20 and the light emitting element 28, and at the same time, the light emitting element with respect to the longitudinal centerline of the through hole 24. 28 is surely concentrically arranged, and moreover, the heat generated in the motor housing 14 due to the rotation of the rotary shaft 18 of the motor 10 is surely prevented from adversely affecting the light emitting element 28. As the insulating sleeve 40, an insulating tape wound around the base end of the light emitting element 28 a plurality of times may be used. -(B) of Drawing 2 shows the 2nd modification of the motor with a rotary encoder of one example mentioned above.

In this modification, the terminal 28 a protruding from the base end of the light emitting element 28 is fixed to the substrate 42. The terminals 28a are fixed to the base plate 42 by fixing means 44 such as an adhesive or solder. The board 42 is removably attached to the inner surface of the bearing bracket 20 by using, for example, a screw so that the light emitting element 28 is inserted concentrically into the through hole 24 from the opening of the through hole 24 on the inner surface of the bearing bracket 20.

The power supply wiring for the light emitting element 28 may be directly connected to the terminal 28a, or a printed wiring electrically connected to the terminal 28a may be prepared in advance on the substrate 42, and this printed wiring may be used. The power supply wiring for the light emitting element 28 can be extended.

Note that, also in this embodiment, as in the case of the first modification described with reference to FIG. It is also possible to attach the insulating tape or to wind the insulating tape as the insulating sleeve 40 around the base end of the light emitting element 28 multiple times.

In the above-described embodiment and the first and second modified examples, the light emitting element 28 is inserted into the through hole 24 of the bearing bracket 20, and the rotary cord plate is concentrically fixed to the rotary shaft 18 of the motor. Although the light receiving element 36 was arranged on the circuit board 34 with 32 sandwiched therebetween, on the contrary, the light receiving element 36 is inserted into the through hole 24 of the bearing bracket 20 and the light emitting element 28 is arranged on the circuit board 34. You can also do it.

In addition, the through hole 24 formed in the bearing bracket 20 for the light emitting element 28 or the light receiving element 36 may be a notch cut out from the peripheral surface of the bearing bracket 20.

[0026]

[Effect of device]

 As described in detail above, in the motor with a rotary encoder according to the present invention, an opening is provided at a predetermined position of the bearing bracket that supports the rotating shaft of the motor, and the light emitting element or the light receiving element is arranged in this opening. Therefore, the encoder mounting base protruding from the outer side surface of the motor bearing bracket is unnecessary, and the length of the rotary encoder motor can be further shortened by the amount of the unnecessary encoder mounting base, and the number of parts is reduced. As a result, the manufacturing cost is reduced.

[Brief description of drawings]

FIG. 1 is a side view showing a motor with a rotary encoder according to an embodiment of the present invention with a main part cut away.

FIG. 2A is a vertical sectional view showing only an essential part of a first modified example of the one embodiment, and FIG. 2B is a vertical sectional view showing only an essential part of a second modified example of the one embodiment. It is a figure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Motor, 12 ... Stator, 14 ... Motor housing, 16 ... Rotor, 18 ... Rotating shaft, 20 ... Bearing bracket, 22 ... Bearing, 24 ... Through hole, 26 ... Fixed code plate, 28 ... Light emitting element, 28a … Terminals, 30… Hubs, 32
... Rotating code plate, 34 ... Circuit board, 36 ... Light receiving element, 3
8 ... Encoder cover, 40 ... Insulation sleeve, 42 ... Substrate, 44 ... Fixing means.

Claims (2)

[Scope of utility model registration request] 1. A motor with a rotary encoder, wherein an opening is provided at a predetermined position of a bearing bracket that supports a rotating shaft of the motor, and a light emitting element or a light receiving element is arranged in the opening. 2. The motor with a rotary encoder according to claim 1, wherein an insulating member is interposed in a gap between the light emitting element or the light receiving element and the opening of the bearing bracket.