JPH03190546A - Motor with a built-in position detector and manufacture thereof - Google Patents

Abstract

PURPOSE:To incorporate a position detector easily and accurately by fixing a code board directly to an output shaft, and attaching a position reader to the housing of a motor, corresponding to the code board. CONSTITUTION:A magnetic code board 14 is fixed so that it may rotate integrally with an output shaft 12. Next, a magnetoresistance element sensor 16, a position information reading means, and a signal processing board 18 for amplifying the signal read by the sensor 16 are fixed to the housing of a motor 8. Then, by the current application to the exciting winding of specified phase in the stator of the motor 8, the rotor and the stator are calculated in the in preset relative positions, and based on the position of the rotor, that is, the positional condition of a magnetic code board 14, the code for positional information of the rotor is magnetized and recoded in the magnetic code board 14 by a magnetizer 20. Hereby, the coordination work for squaring the relative positions of the stator and the rotor to the positional information outputted by the position detector becomes needless, and the incorporation can be done easily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a motor incorporating a position detector and a method of manufacturing the motor incorporating the position detector.

[Conventional technology]

Generally, a position detector is incorporated into a motor by equipping the position detector with a dedicated rotating shaft and connecting this rotating shaft with the output shaft of the motor.

Therefore, a dedicated bearing is required for the position detector, and means for connecting it to the output shaft is also required. Furthermore, when connecting the two, adjustment work is performed to make the relative positions of the rotor and stator of the motor coincide with the output position output from the position detector.

[Problems to be solved by the invention]

However, as mentioned above, it is necessary to provide an independent dedicated bearing mechanism for the position detector, which increases the cost. Also,
It is necessary to connect the rotating shaft for the position detector and the output shaft of the motor, and vibration occurs due to mismatch of their central axes, and countermeasures are required. Furthermore, adjustment work is required to match the relative position of the stator and rotor with the output position of the position detector, which is inefficient.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a motor with a built-in position sensor that is easy and accurate to incorporate a position sensor and is low-cost.

[Means to solve the problem]

In view of the above-mentioned purpose, the present invention has a code plate that records positional information corresponding to the rotational position of the rotor of the motor directly fixed to one end of the output shaft of the motor, and a code plate that is opposite to the code plate. The present invention provides a position detector built-in motor, characterized in that a reading device for reading the position information is attached to a housing portion of the motor.

In addition, if the code plate is a magnetic code plate on which information is magnetically recorded, the method for manufacturing the position sensor built-in motor is to directly fix the magnetic code plate to one end of the output shaft, and then attach the rotor to the rotor. positional information is magnetically recorded on the magnetic code plate.

[For production]

Since the code plate is directly fixed to the output shaft of the motor, there is no need for a dedicated bearing for the detector. Further, since the rotor position information is recorded after the code plate is fixed to the output shaft of the motor, there is no need for adjustment work to match the relative position of the stator and rotor with the output position of the position detector.

〔Example〕

The present invention will be described in more detail below based on embodiments shown in the accompanying drawings. FIG. 1(a) shows the output shaft 12 of the motor 8,
This shows a state in which a magnetic code plate 14 that can be magnetized is to be attached. In this installation, the output shaft 12 is fixed to rotate together with the output shaft 12 using adhesive or screw parts. After this, as shown in FIG. 1(b), a magnetoresistive element sensor 16, which is a positional information reading means, and a signal processing board 18, which amplifies the signal read by the sensor 16, are fixed to the housing part 10 of the motor 8. do. Thereafter, by energizing the excitation winding of a specific phase in the stator of the motor 8, the rotor and stator are indexed to a predetermined relative position, and the position of the rotor, that is, is integrated with the output shaft 12. Based on the positional state of the magnetic code plate 14, a rotor position information code is magnetized and recorded on the magnetic code plate 14 by the magnetizing device 20. During this magnetization, a step feeding drive device 22 is connected to the other end of the output shaft 12 of the motor 8, and the magnetic code plate 14 is
Magnetize the cord while rotating. In reality, dozens
This is done during the magnetization work of hundreds of cords at once to improve work efficiency. 1st rl! J(C) shows the state of magnetization work.

〔Effect of the invention〕

As described above, according to the manufacturing method of the present invention in which the code is recorded on the code plate for the position detector after the code plate is directly assembled into the output shaft of the motor, the relative position between the stator and the rotor can be recorded. Since there is no need for adjustment work to match the position information output by the position detector, there is no need for a dedicated bearing mechanism for the detector. Along with this, since there is no dedicated rotating shaft for the detector, there is no need to connect this to the output shaft of the motor, and therefore, vibrations caused by mismatching of the central axes of the two do not occur. Furthermore, the number of parts is reduced, which contributes to cost reduction, and since the above-mentioned adjustment work is no longer necessary, it is also possible to automate motor assembly.

[Brief explanation of drawings]

FIGS. 1(a), 1(b), and 1(c) are perspective views illustrating the process of assembling a position detector into a motor. 8... Motor, 12... Output shaft, 14... Magnetic code plate, 20... Magnetizing device, 22
...Drive device for step feeding during magnetization work.

Claims (1)

[Claims] 1. A code plate recording positional information corresponding to the rotational position of the rotor of the motor is directly fixed to one end of the output shaft of the motor, and the above-mentioned A motor with a built-in position detector, characterized in that a reading device for reading position information is attached to a housing part of the motor. 2. The position detector built-in motor according to claim 1, wherein the code plate is a magnetic code plate, and the position information is magnetically recorded. 3. The position detector built-in type according to claim 2, wherein the rotor position information is magnetically recorded on the magnetic code plate after the magnetic code plate is directly fixed to one end of the output shaft. How to manufacture a motor. 4. The method for manufacturing a position detector built-in motor according to claim 3, wherein recording of the position information on the magnetic code plate is performed after determining the relative position between the rotor and the stator to a predetermined position. . 5. The method of manufacturing a position detector built-in motor according to claim 4, wherein the relative position between the rotor and the stator is determined by energizing a predetermined excitation winding of the stator.