JPH11287648A - Motor with rotation detecting function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily add rotation detecting function to a general motor by fixing a circuit board having a circuit detecting means thereon to a motor terminal by solder welding. SOLUTION: A circuit board 7 has a center hole fitted to the projection 3a of a motor rear case, and a motor terminal 4 is pierced through the circuit board 7 through the terminal hole. The circuit board 7 is fixed to a DC motor by soldering the soldering land around the terminal hole to the motor terminal 4. A rotor 15 is press fitted into a rotating shaft 2. Since a photo-interrupter 13 is opened in parallel to the rotating shaft, the rotor 15 can be assembled without mutual interruption. Further, since the rotor 15 is designed so that a slit is provided to fit the circumferential surface of the rotor to the recessed part of the photo-interrupter 13, the slit successively passes the recess of the photo-interrupter 13, and the photo-interrupter 13 thus can detect the rotation of the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor having a rotation detecting function for detecting the rotation, position, speed and the like of a rotating shaft of a servomotor or the like.

[0002]

2. Description of the Related Art Motors capable of converting electric energy into power are used in various fields. In order to improve the performance of products, motor rotation control is required to be more accurate and more efficient, but low cost is an essential element. In recent years, the use of DC servomotors with high efficiency and low noise has been rapidly increasing, particularly in OA equipment.

FIG. 9 is a diagram showing the structure of a conventional DC servomotor. 20 is a main body case, 21 is a rear case attached to the rear of the main body case 21, 22
Is an input terminal, 23 is a rotating shaft, 24 is a pedestal for holding a rotation detecting unit, and is assembled to the rear case 21 by screws 30. 25 is a transmission type photo interrupter, which is a pedestal with the reading plate 26 sandwiched in a concave portion. Screw 3 on 24
Reference numeral 26 denotes a reading plate which is fixed at 1 and detects the rotation of the reading plate and is connected in advance with a wire harness 29. The reading plate 26 is provided with a large number of slits (holes) radially and is press-fitted into the rotating shaft 24. Since the reading plate 26 is perpendicular to the rotation axis, the photo-interrupter 25 must be mounted so as to be sandwiched from a side direction, so that the mounting requires screwing. 27 is a rear cover which is a screw 3
2 prevents the dust from entering the rotation detector and protects the detector, while being fixed to the pedestal 24. Terminal 22
Is connected to a lead wire 28.

[0004]

As is apparent from FIG. 9, since the rear case 21 needs a sufficient thickness for fixing screws, it is necessary to use an expensive rear case for the motor body.

[0005] Since many parts such as screws and pedestals are required, material costs cannot be suppressed.

[0006] The assembly is complicated and the production cost is greatly increased. Heretofore, such motors have been designed exclusively for use, and therefore have a low production volume and are very expensive.

An object of the present invention is to provide a motor having a rotation detecting function which has a simple structure and does not impair the functions of a conventional model.

[0008]

In order to achieve the above object, a motor according to the present invention is characterized in that a circuit board provided with rotation detecting means on a circuit board is fixed by soldering to a motor terminal. I do.

With this configuration, it is possible to easily add a rotation detecting function to a general motor.

[0010]

According to the first aspect of the present invention, the rotation of the rotating shaft of the motor is detected by a motor having a contact terminal which is substantially parallel to the rotating shaft and protrudes from a surface substantially perpendicular to the rotating shaft. A motor with a rotation detecting function, characterized in that the circuit board provided with the rotation detecting means is fixed by solder welding with the terminal, with a rotation detecting means for easily assembling the rotation detecting means of the rotation axis of the motor. You can get a motor.

According to a second aspect of the present invention, in the motor according to the first aspect, at least one protrusion is provided on the vertical surface, and the position of the circuit board is regulated by the protrusion. The assembling accuracy of the rotation detecting means of the rotating shaft of the motor with the detecting means can be improved.

According to a third aspect of the present invention, in the motor according to the first aspect, the vertical surface has a bearing for rotating and holding a rotating shaft projecting from the vertical surface, and the circuit board is concentrically regulated with the bearing. Thus, it is possible to obtain a motor with a rotation detecting means in which the accuracy of assembling the rotation detecting means of the rotating shaft without processing the vertical surface is improved.

The invention according to claim 4 is the first or second invention.
Alternatively, in the motor described in 3, the rotation of the rotating shaft is detected by a photointerrupter, so that inexpensive and high-performance rotation detecting means can be obtained.

According to a fifth aspect of the present invention, there is provided the first or second aspect.
Or the motor according to 3 or 4, wherein a protective cover for protecting the rotation of the rotating shaft and the detecting means for the rotating shaft is assembled to the circuit board, and the motor is used for assembling the protective cover to the circuit board. There is no need to perform any special processing on the main body, and an inexpensive motor with rotation detecting means can be obtained.

According to a sixth aspect of the present invention, there is provided a motor having a rotation detecting function for detecting rotation of the rotating shaft by a photo interrupter according to the fourth aspect, wherein light is applied to a circumferential surface of a rotor integrally formed with the rotating shaft. By forming the transmission part and the non-light transmission part, it is possible to easily assemble the rotation detection part to the motor.

[0016]

Embodiments of the present invention will be described below. FIG. 1 is a diagram showing the appearance of a general DC motor used in the present embodiment. 1 is a main body case, 2 is a rotating shaft, 3 is a rear case perpendicular to the rotating shaft and has a protruding portion 3a, and 4 is a terminal, which protrudes from a vertical plane in a direction substantially horizontal to the rotating shaft. FIG. 2 is a view showing details of a rear case of a general DC motor used in this embodiment. 1 are given the same numbers. The rear case 3 is made of sheet metal, and the protruding portion 3a is formed by drawing and holds a bearing 5 for rotatably supporting the rotary shaft 2 therein. Reference numeral 6 denotes a resin insulating member which holds the terminal 4 in a state of being electrically insulated from the rear case 3.

FIG. 3 is a configuration diagram of a circuit board used in this embodiment. The circuit board 7 has a center hole 8 for fitting with the projection 3a of the rear case 3 of the motor, a terminal hole 9 for a terminal of the motor to pass through, a hole for mounting a photo interrupter, a hole 11 for mounting a connector, and a hole 11 for mounting a cover. A hole 12 is provided. Lands (hatched portions) for solder are provided around the holes 9, 10, and 11 and are electrically connected by a pattern.

FIG. 4 is a diagram showing the assembling of the circuit board used in the present embodiment. The circuit board is assembled in this state in advance and then the DC motor is assembled.

FIG. 5 is a structural view showing a rotor used in the present embodiment, and has a center hole 15 into which the rotating shaft 2 is press-fitted at the center.
Along with b, an innumerable slit 15c for blocking the photo interrupter is provided on the outer peripheral portion.

FIGS. 6 and 7 show a D with a rotation detecting function according to this embodiment.
FIG. 8 is a view showing the assembly of the C motor, and FIG. 8 is a view showing a completed state of the DC motor with a rotation detecting function of the present embodiment. Reference numeral 7 denotes the circuit board shown in FIG. 4, on which the photo interrupter 13 and the connector 14 are already mounted. The circuit board 7 has the center hole 9 formed with the protrusion 3a of the rear case of the motor.
And the terminal 4 of the motor penetrates the circuit board through the terminal hole 9. The circuit board 7 is fixed to the DC motor by soldering (C) the solder lands around the terminal holes and the motor terminals 4. Next, the rotor 15 is pressed into the rotating shaft 2. In this embodiment, since the photointerrupter 13 is opened in a direction parallel to the rotation axis, the rotor can be assembled without interfering with each other, and a slit 15c is provided in a circumferential portion of the rotor 15; Since the circumferential surface of the rotor 15 is designed to enter the concave portion of the photo interrupter 13, when the rotation shaft and the rotor rotate, the slit 15c provided in the rotor is formed.
Sequentially pass through the concave portion of the photo interrupter, and the photo interrupter can detect the rotation of the motor.
Subsequently, the cover 16 is attached to the circuit board 7. The circuit board 7 has a hole 12 for attaching a protective cover, and the cover 16 has a claw 16 for attaching.
d is provided and can be easily assembled to the circuit board 7. On the circuit board, the terminals 4 are electrically connected to the photointerrupter 13 and the solder lands of the motor terminals. Therefore, the signal line of the photo interrupter and the drive line of the motor can be connected by a motor control board (not shown) with a single wire harness.

[0021]

As described above, according to the present invention, a rotation detection function can be easily added to a general motor.

Since a general motor can be used as the control motor, a wide variety of motor specification options and an inexpensive motor can be used.

The structure of the rotation detecting function section is simple and the detecting section can be easily assembled to the motor.

The signal line of the rotation detecting function and the drive line of the motor can be connected by a single terminal, so that the connection between the motor control board and the motor can be simplified. The effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing the appearance of a general DC motor used in the present embodiment.

FIG. 2 is a diagram showing details of a rear case of a general DC motor used in the present embodiment.

FIG. 3 is a configuration diagram of a circuit board used in the present embodiment.

FIG. 4 is a diagram showing the assembly of a circuit board used in the present embodiment.

FIG. 5 is a structural view showing a rotor used in the embodiment.

FIG. 6 is a diagram showing the assembly of the DC motor with a rotation detection function according to the embodiment.

FIG. 7 is a diagram showing the assembly of the DC motor with a rotation detection function according to the embodiment.

FIG. 8 is a diagram showing a completed state of the DC motor with a rotation detection function according to the embodiment;

FIG. 9 is a diagram showing the structure of a conventional DC servomotor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body case 2 Rotating shaft 3 Rear case 4 Terminal 5 Bearing 6 Insulating member 7 Circuit board 8 Center hole 9 Terminal hole 10 Photointerrupter hole 11 Connector hole 12 Cover hole 13 Photointerrupter 14 Connector 15 Rotor 16 Cover 17 wire harness 20 main body case 21 rear case 22 terminal 23 rotating shaft 24 pedestal 25 photo interrupter 26 reading plate 27 cover 28 lead wire 29 wire harness 30 screw 31 screw 32 screw

Claims (6)

[Claims] A motor having contact terminals protruding from a surface substantially parallel to the rotation axis and substantially perpendicular to the rotation axis; a circuit board provided with rotation detection means for detecting rotation of the rotation axis of the motor; A motor having a rotation detection function, which is fixed by soldering with the terminal. 2. The motor with a rotation detecting function according to claim 1, wherein at least one projection is provided on the vertical surface.
A motor with a rotation detecting function, wherein the position of the circuit board is regulated by the protrusion. 3. A motor with a rotation detecting function according to claim 1, wherein said vertical surface has a bearing which rotates and holds a rotating shaft projecting from said vertical surface, and said circuit board is concentrically regulated with said bearing. Characterized motor with rotation detection function. 4. A motor with a rotation detecting function according to claim 1, wherein the rotation of the rotating shaft is detected by a photo interrupter. 5. A motor with a rotation detecting function according to claim 1, wherein a protective cover for protecting the rotation of the rotating shaft and a means for detecting the rotating shaft is assembled to the circuit board. Motor with rotation detection function. 6. A motor with a rotation detecting function for detecting rotation of a rotating shaft by a photo interrupter according to claim 4, wherein the motor has a rotor integrally formed with the rotating shaft. A motor having a rotation detecting function, comprising: a circumferential surface extending substantially horizontally with the rotation axis; and a light transmitting portion and a non-light transmitting portion formed on the circumferential surface.