JPH0311966A - Motor control signal generator - Google Patents

Abstract

PURPOSE:To improve the accuracy and to increase output amplitude by providing a rotor for performing outsert resin molding of slits covering the outer surface of rotor and an optical sensor facing the slit section. CONSTITUTION:Slit sections 19 produced through outsert molding of rotor boss molding resin and a rotor boss 18 subjected to galvanization having high light reflection efficiency are molded integrally on a rotor yoke 10. Upon rotation of motor, the rotor yoke 10 rotates and the light emitted from the light emitting section 16 in an optical sensor 15 is reflected from the slit section 19 and projected to a light receiving section 17 where the light is absorbed on the resin surface. An FG output signal having frequency corresponding to the speed of revolution of the motor is obtained based on the intensity of light projected into the light receiving section 17.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a motor control signal generator used to drive a reel motor.

2. Description of the Related Art A motor control signal generator used in a conventional road motor will be explained with reference to FIGS. 3 and 4.

FIG. 3 is a plan view of a conventional reel motor, and FIG. 4 is a side sectional view.

In FIGS. 3 and 4, 1 is a cap press-fitted into the rotor boss 4, 2 is a drive claw slidably inserted into the rotor boss 4, and 3 is a reel spring interposed between the rotor boss 4 and the drive claw 2. , 4 is a rotor boss caulked to the rotor yoke 10, 5 is a shaft press-fitted into the rotor boss 4, 6 is a ball bearing that is held in the bearing housing 8 and rotatably supports the shaft 5, and 7 is a bearing that is locked to the bearing housing 8. 8 is a bearing housing caulked onto the stator plate 13; 9 is an FG reflector bonded to the rotor yoke 10; 10 is a rotor yoke fixed to the rotor boss 4 so as to cover the drive magnet 11; 11 is attracted to the rotor yoke 10. Fixed drive magnet, 1
2 is a drive coil glued on the stator plate 13 so as to face the drive magnet 11; 13 is a drive magnet 1;
a stator plate fixed to the bearing housing 8 in parallel with 1;
14 is a sensor angle fixed to the stator plate 13 so as to protrude above the rotor yoke 10; 15 is an optical sensor mounted opposite to the FG reflector 9 by the sensor angle 14; 16 is a light emitting part inside the optical sensor 15; Reference numeral 17 denotes a light receiving section inside the optical sensor 15, and reference numeral 20 denotes a brake mounted on the stator plate 13 so as to be able to press against the rotor yoke 10.

The operation of the conventional motor control signal generator configured as described above will be explained.

The part that generates a signal whose frequency changes as the motor rotates (hereinafter referred to as FG) is generated when the FG reflector plate 9, which has bright and dark printing as shown in Fig. 3, rotates as the motor rotates. The amount of reflected light emitted from the light emitting part 6 of the optical sensor 15 located at the opposite position changes, and the output level of the light receiving part 17 of the optical sensor changes. As a result, an FG multiplied signal with a frequency corresponding to the rotational speed of the motor is obtained, thereby controlling the speed of the motor.

Problems to be Solved by the Invention However, with the above configuration, due to the processing of the FG reflector, there are large errors in brightness and darkness due to printing blur, and
When attaching the G reflector, there is a problem that the FG accuracy deteriorates due to positional deviation, and that it is impossible to increase the FG specific output by changing the light receiving efficiency in bright and dark areas depending on the distance from the light receiving part.

The present invention solves the above problems and provides a motor control signal generating device with high precision and large output amplitude.

Means for Solving the Problems In order to solve the above problems, in the present invention, when the rotor boss is integrally molded with a resin having low reflection efficiency on the rotor yoke, which is plated to increase the light reflection efficiency of the light reflection part, The light-receiving efficiency of the optical sensor changes depending on the distance from the reflector to the rotor yoke surface, which is the light-reflecting part. The optical sensor is placed at the maximum position.

Effect With the above configuration, the light emitted from the light emitting part of the optical sensor provided opposite to the light reflecting part is reflected on the rotor yoke surface and enters the light receiving part, and the amount of light that is absorbed by the resin molded part and entering the light receiving part is reduced. changes the output of the optical sensor by becoming extremely small. This generates a motor control signal.

Note that here, the distance between the optical sensor and the dark area (resin surface of the resin slit portion) is shorter than the distance at which the light receiving efficiency is maximum due to its structure, so the light receiving efficiency becomes low. This allows an FG ratio output with a large output amplitude to be obtained.

Embodiment An embodiment of the present invention will be explained with reference to FIGS. 1 and 2. Note that the same components as those in the conventional example shown in FIG. 4 are given the same reference numerals, and their explanations will be omitted.

FIG. 1 is a plan view of an embodiment of the present invention, and FIG. 2 is a side sectional view.

In FIGS. 1 and 2, 19 is a slit portion formed by outsert-molding rotor boss molding resin on the rotor yoke, 18 is a rotor boss integrally molded with the rotor yoke 10, and 10 is a rotor yoke plated with high light reflection efficiency. 8
The rotor yoke is integrally molded with the rotor yoke.

The operation of the motor control signal generator configured as above will be explained.

When the motor rotates, the rotor yoke 10 rotates. As a result, the light emitted from the light emitting section 16 of the optical sensor 15 is transmitted to the slit section 1 formed in a predetermined number on the rotor yoke 10.
At 9, the light reaches the plated surface of the rotor yoke 10, is reflected there, and enters the light receiving section 17. On the other hand, in the resin molded part, the light emitted from the light emitting part 1B is absorbed by the resin surface because the resin has low reflection efficiency, and the light that reaches the light receiving part becomes extremely small. In this manner, an FG output signal having a frequency corresponding to the rotational speed of the motor is obtained through an electric circuit depending on the intensity of light incident on the light receiving section.

Effects of the Invention As described above, the Tanabata control signal generator of the present invention has a bright and dark part for light reflection made of resin slits that are outsert-molded on the rotor surface, so that the pitch accuracy of the bright and dark areas is high. A light reflecting part with good concentricity can be realized, and the distances between the light sensor and the bright part (rotor plating surface) and dark part (resin molding part surface) are different, so the distance to the reflector, which is a characteristic of the light sensor, can be achieved. According to the principle of output magnitude, an FG output with a large amplitude can be obtained.

In addition to the above effects, the rotor boss 18 and rotor yoke 1
By integrally forming the rotor 0, the positioning portion of the drive magnet 11 is formed, and the outer periphery of the rotor yoke 10 is formed of resin, thereby making it possible to stabilize the braking effect.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a reel motor equipped with a motor control signal generator according to an embodiment of the present invention, FIG. 2 is a side sectional view of a reel motor according to this embodiment, and FIG. 3 is a conventional reel motor. FIG. 4 is a side sectional view of a conventional reel motor. 10... Rotor yoke, 15... Optical sensor, 1
6... Light emitting section, 17... Light receiving section, 18...
・Rotor boss, 19...slit part.

Claims (1)

[Claims] A device for generating a control signal for controlling a reel motor that drives a reel stand, comprising: a rotor formed by outsert resin in a slit shape so as to cover the outer surface of the rotor of the motor; A motor control signal generating device comprising: an optical sensor provided opposite to the slit portion of the rotor.