JPH0662595A - Variable-speed motor - Google Patents

Abstract

PURPOSE:To provide a variable-speed motor being small-sized and excellent in temperature characteristics, in which the omission of a wiring can be realized and a speed detection element is positioned easily. CONSTITUTION:A variable-speed motor has a structure where a motor cover is provided in the rear part of a motor body 1 and a motor-driving capacitor, speed control circuit and speed detection element are mounted in the motor cover. In this case, when a Hall IC is used as speed detection element, the influence by temperature is reduced because the rotational speed of the motor is detected by frequency. Also, when the speed detection element is directly mounted on a printed board and a pawl for positioning the printed board is provided in the cover, the speed detection element is positioned easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable speed motor equipped with a speed control circuit, a speed detecting element and a driving capacitor.

[0002]

2. Description of the Related Art In recent years, motors have been used not only as power sources but also for speed control, position control, torque control and the like. In particular, the demand for variable speed motors is great. FIG. 6 shows a conventional variable speed motor device, which will be described below.

A capacitor drive type variable speed motor device is
Motor 23, motor driving capacitor 22, speed detection element 2
4. It consists of speed control circuit 21. By the way, conventionally, before using each component, the motor 23 and the motor driving capacitor 22, the motor 23 and the speed control circuit 21, the speed control circuit
21 and the speed detecting element 24 were respectively connected. In addition, the speed control circuit 21 main body usually includes a terminal board 20, a mounting plate (not shown), a mounting hole (not shown), etc., in which a board on which electronic components are mounted is put in a case such as synthetic resin or metal. It was arranged and attached with screws. The motor driving capacitor 22 was also mounted by disposing the mounting hole 26. When a tacho generator is used as the speed detecting element, it is necessary to position the circular magnet 31 attached to the rear portion of the motor shaft and the coil portion 30 of the tacho generator as shown in FIG. Is provided
The coil portion 30 of the tachogenerator was mounted in it, and fixed by the screw 29 and attached. 28 in the drawing is a mounting hole provided in each member.

[0004]

However, in the above configuration, the troublesome work of connecting the motor 23, the motor driving capacitor 22, the speed control circuit 21, and the speed detecting element 24 as shown in FIG. 6 is required. In addition, there was a problem of miswiring even after the wiring was completed. Further, there is a problem that the speed detecting element 24, the speed control circuit 21, and the motor driving capacitor 22 must be attached respectively. In particular,
Since the tacho generator is used for the speed detecting element 24, when mounting, it is necessary to perform positioning processing for both the motor 23 and the coil portion 30 of the tacho generator, as shown in FIG. Since the rotation speed of the motor is detected by the voltage generated by the tachogenerator, the magnetic flux of the magnet and the resistance value of the coil are changed depending on the temperature, and the generated voltage is changed, so that the rotation speed is changed.

The present invention solves the above conventional problems.

[0006]

In order to solve the above problems, the present invention incorporates a speed control circuit, a speed detecting element, and a motor driving capacitor inside a motor cover arranged in the rear portion of a motor body. It is configured.

[0007]

In the above construction, the troublesome wiring work required before operating the motor is eliminated, and erroneous wiring is eliminated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in the figure, the variable speed motor is composed of a motor body 1 and a bottomed cylindrical motor cover 2 attached to the rear portion thereof. As shown in FIG. 2, the operation detecting magnet 6 is extended on the end surface of the motor 1 and the motor lead wire 7 is led out. As shown in FIG. 3, the above-mentioned motor cover 2 is composed of an annular printed board fixing cover 8, a disk-shaped printed board 9, and a bottomed cylindrical protective cover 10. The printed circuit board fixing cover 8 is provided with two printed circuit board positioning claws 14 and three printed circuit board fixing claws 15. As shown in FIG. 4, a Hall IC 16 as a speed detecting element, a speed control circuit (not shown) mounted on the printed board 9, and a motor operating capacitor 17 are attached to the printed board 9. As shown in FIG. 3, the bottom plate portion of the protective cover 10 is provided with a speed adjusting volume mounting hole 11, a rotation direction changeover switch mounting hole 12, and a power switch mounting hole 13. As shown in FIG. 2, the protective cover 10 is provided with a speed adjusting potentiometer 3, a rotation direction changeover switch 4, and a power switch 5.

As shown in FIG. 5, a printed circuit board fixing cover 8 is laid on the end face of the motor 1, and a protective cover is provided on the cover 8.
Stack 10 and tighten together with screws to secure. At the time of this assembly, the printed circuit board positioning claws 14 and the printed circuit board fixing claws 15 of the printed circuit board fixing cover 8 engage with the notches on the outer circumference of the printed circuit board 9 to perform positioning and fixing.
Further, the printed circuit board fixing claw 15 fits into the notch of the protective cover 10 to position the protective cover 10.

With the variable speed motor having this structure, it is possible to eliminate any problems associated with the wiring work that has been conventionally required to perform variable speed. Further, since the speed detecting element 16 is directly attached to the printed circuit board 9 and the printed circuit board fixing cover 8 is provided with the printed circuit board positioning claw 14, positioning with the speed detecting magnet 6 is performed for the spigot on the motor body 1. It is possible without installing holes and positioning screws.

When a Hall IC is used as the speed detecting element, the influence of temperature can be reduced because the rotational speed of the motor is detected by frequency, as compared with the case of using a conventional tachogenerator.

[0012]

As is apparent from the above description of the embodiment, the present invention can be used by incorporating all the components necessary for variable speed of the motor into the motor cover attached to the rear part of the motor. On the worker side, it becomes possible to eliminate troublesome wiring work. Also, by directly mounting the speed detecting element on the printed circuit board and providing the printed circuit board positioning claws on the cover, it is possible to perform one positioning process required for both the motor body and the speed detecting element. Very advantageous and convenient in manufacturing.

[Brief description of drawings]

FIG. 1 is a perspective view of a variable speed motor according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the variable speed motor.

FIG. 3 is an exploded perspective view of a cover portion of the variable speed motor.

FIG. 4 is a sectional view taken along line I-I in FIG.

5 is a sectional view taken along line II-II in FIG.

FIG. 6 is a block diagram of a conventional variable speed motor device.

FIG. 7 is an exploded perspective view of essential parts of the variable speed motor.

[Explanation of symbols]

 1 Motor Main Body 2 Motor Cover 3 Speed Adjustment Volume 4 Rotation Direction Switch 5 Power Switch 6 Speed Detection Magnet 7 Motor Lead Wire 8 Printed Circuit Board Fixing Cover 9 Printed Circuit Board 10 Protective Cover 14 Printed Circuit Board Positioning Claw 15 Printed Circuit Board Fixing Claw 16 Speed detection element 17 Capacitor for motor operation

Claims (2)

[Claims] 1. A motor main body, a motor cover arranged at a rear portion of the motor main body, a speed control circuit, a speed detecting element and a motor driving capacitor arranged inside the motor cover, and a motor cover arranged on the back surface of the motor cover. A variable speed motor comprising a volume for setting the motor speed, a changeover switch for changing the rotation direction of the motor, and a power switch for turning the power on and off. 2. The variable speed motor according to claim 1, wherein a claw provided on the motor cover is engaged with the printed board to position the speed detecting element directly attached to the printed board with respect to the speed detecting magnet provided on the motor body. .