JPH08168210A - Encoder unit, control motor, and assembly of control motor - Google Patents

Abstract

PURPOSE: To provide a small-size control motor which can be assembled easily by letting an encoder frame serve as a first flange of a motor and assembling each component of the motor on an encoder unit. CONSTITUTION: An encoder shaft 18 which has a hole to insert a motor shaft 34 into is rotatably mounted on an encoder frame 12 which will become a rear flange of a motor. To the encoder shaft 18, a disc with slits is secured. Information on rotation of the encoder shaft is detected by photocouplers 22, 26. Around a magnet 36 which will function as a rotor, a stator core 38 which has a winding 40 which will function as a stator is located. By assembling each component of the motor to the encoder unit, a small-size control motor with an encoder can be assembled more easily than direct assembling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control motor capable of speed control and position control and an encoder incorporated in this type of motor.

[0002]

2. Description of the Related Art In the field of transportation and stages, a control motor capable of position control and speed control is used as a power source. In such a control motor, an encoder is generally built in as a means for detecting rotation information of the motor shaft, such as rotation speed and angular position. Optical encoders and magnetic encoders are well known as encoders.

As a method of manufacturing a control motor having an encoder built therein as described above, there is a retrofitting method of attaching an encoder unit completed as a unit to an ordinary motor, and an encoder by assembling each part of the encoder to the ordinary motor. There are two direct attachment methods to complete.

In the post-installation method, generally, a motor manufacturer purchases an encoder unit that is completed as a unit supplied from an encoder manufacturer, and separately installs this encoder unit on an ordinary motor manufactured in-house. Has completed a control motor equipped with an encoder.

On the other hand, in the direct attachment method, the motor manufacturer sends the motor produced by itself to the encoder manufacturer, and the encoder manufacturer attaches each part of the encoder to the flange of the motor to provide the encoder. The control motor has been completed.

[0006]

The retrofitting method has an advantage that the motor and the encoder can be easily assembled. However, on the other hand, since the encoder unit, which is a completed product itself, is attached to the motor, which is also a completed product, the entire configuration of the control motor including the encoder is large, That is, the structure is long in the axial direction. Users want smaller control motors, so retrofitting is not a good way to meet user demands.

The direct mounting method has an advantage that a part of the encoder is directly mounted on the flange of the motor, so that the frame of the encoder unit is not required, and the entire structure of the control motor is finished in a small size. However, the work of mounting each encoder part on the motor shaft or flange one by one is considerably more difficult than the work of mounting the encoder unit. In addition, since the motor manufacturer requests the encoder manufacturer to assemble the encoder, it will increase the transportation cost, and it will be a burden for the motor manufacturer in terms of schedule management because there is no item at hand. . An object of the present invention is to provide a small control motor which can be easily assembled.

[0008]

An encoder unit according to the present invention is an encoder unit incorporated in a control motor, the encoder shaft having a hole into which a motor shaft is inserted, and a detection means for detecting rotation information of the encoder shaft. And an encoder frame that rotatably supports the encoder shaft and that serves as a first flange of the control motor.

A control motor according to the present invention comprises a pair of the encoder unit, a motor shaft having a rotor inserted into and fixed to an encoder shaft, a stator for rotating the rotor, and a first flange which is an encoder frame. And a second flange that rotatably supports the motor shaft.

The method of assembling the control motor according to the present invention is as follows.
Prepare the above encoder unit, insert the motor shaft equipped with the rotor to the encoder shaft of the encoder unit, and arrange the stator around the rotor,
The process of assembling the second flange, adjusting the angle between the motor shaft and the encoder shaft, and fixing the encoder shaft to the motor shaft is included.

[0011]

In the present invention, the encoder frame is used as the first flange of the motor, and each component of the motor (motor shaft with rotor, stator, second flange, etc.) is assembled to the encoder unit, and the encoder is built in. The control motor that operates is assembled.

[0012]

EXAMPLE An example of the present invention will be described with reference to FIG. The figure shows the cross-sectional structure of a control motor incorporating an optical encoder. This control motor is manufactured by assembling the motor parts to the encoder unit. Therefore, in the following description, the configuration of the encoder unit will be described first,
After that, the procedure for assembling the motor parts to the encoder unit will be described.

As shown in the figure, an encoder shaft 18 is rotatably attached to the encoder frame 12 via two bearings 14 and 16, and a play in the thrust direction is adjusted by a screw 20. A disc 21 having a slit is fixed to the encoder shaft 18. A light source such as an LED 22 that emits light toward the slit of the disk 21 is fixed to the encoder frame 12. A mask 24 is arranged between the LED 22 and the disk 21, and the mask 24 is fixed to the encoder frame 12.
On the opposite side of the LED 22 with the disk 21 as the center, a light receiving element 2 for receiving the light passing through the slit of the disk 21.
6 are arranged. The light receiving element 26 is mounted on a substrate 28, and the substrate 28 is fixed to the encoder frame 12 by a fixing means (not shown). Here, the disk 21, the LED 22, the light receiving element 26, and the like are components of the detection means. The encoder shaft 18 has a through hole, the end portion of which is thin, and a groove which divides the encoder shaft 18 into four in the circumferential direction is formed, which is not visible in the drawing. A fixing ring 30 for fixing the encoder shaft 18 to a motor shaft 34, which will be described later, inserted into the through hole is fitted around it. Fixing ring 30
Is a fixing screw 3 for pressing each of the four-divided thin end portions of the encoder shaft 18 against the motor shaft 34.
Have two.

The structure described above is an encoder unit, to which each part of the motor is assembled. Next, the procedure will be described. The motor shaft 34 having the magnet 36 functioning as a rotor is inserted into the through hole of the encoder shaft 18.
Around it, a stator core 38 having a winding 40 that functions as a stator is arranged. The front flange 44 is assembled to the motor shaft 34 with the bearing 42 interposed, and the screw 46 is fastened to the encoder frame 12, whereby the front flange 44 and the stator core 38 are fixed to the encoder frame 12. After that, the relative angular position between the motor shaft 34 and the encoder shaft 18, that is, the electrical angle is adjusted, and after the adjustment is completed, the fixing screw 32 is tightened to fix the encoder shaft 18 to the motor shaft 34. Finally, fix the encoder cover 48 with screws and the like.
After fixing to, a control motor having the structure shown in the figure is obtained.

As described above, in the control motor according to the present embodiment, the encoder frame 12 forms a pair with the front flange that serves as the second flange of the motor, that is, the rear flange that serves as the first flange of the motor. Since it also serves as a flange, the length dimension in the axial direction is smaller than that of a control motor manufactured by a so-called retrofit method, which is manufactured by combining an encoder unit and a motor, both of which are finished products.

Further, in this embodiment, the control motor having the encoder, which is the final product, is manufactured by assembling the motor parts to the encoder unit. Therefore, the control motor is assembled by assembling the encoder parts to the motor. The assembly work can be performed more easily than the so-called direct mounting method, which completes.

In the above-mentioned embodiment, the control motor using the optical encoder has been described as an example, but the same argument can be applied to the case of using the magnetic encoder.

Further, the technical idea of the following constitution is derived from the above specific embodiment, and the following effects are achieved. 1. An encoder unit incorporated in a control motor, which is an encoder shaft having a hole into which a motor shaft is inserted, a detection unit that detects rotation information of the encoder shaft, and an encoder frame that rotatably supports the encoder shaft. An encoder unit having an encoder frame that serves as the first flange of the motor.

2. The encoder unit according to claim 1, a motor shaft that is inserted into and fixed to an encoder shaft and that includes a rotor, a stator for rotating the rotor, and a first flange that is an encoder frame, and a motor. A control motor having a second flange rotatably supporting the shaft.

3. Prepare the encoder unit described in paragraph 1, insert the motor shaft equipped with the rotor into the encoder shaft of the encoder unit, arrange the stator around the rotor, assemble the second flange, and set the angle between the motor shaft and the encoder shaft. And assembling the control shaft, and fixing the encoder shaft to the motor shaft.

4. An encoder unit incorporated in a control motor, which is an encoder shaft having a hole into which a motor shaft is inserted, a detection unit that detects rotation information of the encoder shaft, and an encoder frame that rotatably supports the encoder shaft. An encoder unit in which the encoder frame functions as the first flange of the control motor. This results in a control motor with an encoder that is small and easy to assemble.

[0022]

According to the present invention, it is possible to obtain a control motor which is easy to assemble and is small in size.

[Brief description of drawings]

FIG. 1 is a diagram showing a cross-sectional structure of a control motor according to an embodiment of the present invention.

[Explanation of symbols]

12 ... Encoder frame, 18 ... Encoder shaft, 21 ... Disk, 22 ... LED, 26 ... Light receiving element, 30 ... Fixing ring, 32 ... Fixing screw, 34 ... Motor shaft, 36 ... Magnet, 38 ... Stator core,
44 ... Front flange.

Claims (3)

[Claims] 1. An encoder unit incorporated in a control motor, comprising: an encoder shaft having a hole into which a motor shaft is inserted; detection means for detecting rotation information of the encoder shaft; and an encoder for rotatably supporting the encoder shaft. An encoder unit that is a frame and has an encoder frame that serves as a first flange of a control motor. 2. The encoder unit according to claim 1, a motor shaft having a rotor that is inserted into and fixed to the encoder shaft, a stator for rotating the rotor, and a first flange that is an encoder frame. And a second flange that rotatably supports the motor shaft. 3. An encoder unit according to claim 1 is prepared, a motor shaft having a rotor is inserted into an encoder shaft of the encoder unit, a stator is arranged around the rotor, and a second flange is assembled to the motor shaft. And a method of assembling a control motor, which includes the step of adjusting the angle of the encoder shaft and fixing the encoder shaft to the motor shaft.