JPS6216753Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small commutator motor that can be easily switched between direct current and alternating current.

Small commutator motors that use permanent magnets as a field are used in various industrial equipment, household equipment, toys, etc., and are mass-produced on a large scale. Direct current or alternating current is used as the power source, and in the case of direct current, a dry cell or storage battery is used, and in the case of alternating current, a rectifier is used. However, in the mass production process of such motors, there are cases where the number of users has not yet been determined and it has not been decided whether the motor will be used for direct current or alternating current. Therefore, if the motor is manufactured to a state as close to completion as possible, and as soon as the user specifies whether it is DC or AC, the necessary minor processing is immediately performed and shipped, which will help maintain mass production.
It has great advantages in terms of shorter delivery times and lower costs.

The present invention was developed in view of the above.If the motor is for DC use, the motor is made in a complete state, and if the motor is for AC use, a rectifier is easily attached to the completed motor from the outside. The present invention provides a small commutator motor that can be used as a small commutator motor. Next, this will be explained in detail with reference to examples.

FIG. 1 shows an embodiment of the present invention, in which 1 is a permanent magnet constituting the field of a small commutator motor, 2 is a rotor, and 3 is a housing for these. The housing 3 is formed by pressing a metal plate into a cylindrical shape, and one end surface 3a of the housing 3 serves as an end bracket to support the rotating shaft 4 of the rotor 2. Reference numeral 5 designates a ball metal for a bearing provided on the support portion, and reference numeral 6 designates a holding plate that supports the ball metal together with the end surface 3a. A permanent magnet 1 is attached to the inner periphery of a cylindrical portion of the housing, and an end bracket 7 formed by resin molding is attached to the other open end surface of the housing 3. This end bracket is also provided with a bearing ball metal 8 that supports the rotating shaft 4 at the center of the inner surface, and a recess 7a for accommodating the rectifier 10 on the outer surface between the center and the periphery. A pair of multiple through holes are provided between the center and the center, and a pair of terminal fittings 9 having jack portions are attached to these holes so as to hold the circumferential wall of the hole as shown. Rotating shaft 4 on this end bracket 7 side
A commutator 11 is attached to the commutator, and a pair of brushes 12 and 13 that come into contact with the commutator are attached to the end bracket 7 portion to which the terminal fitting is attached.

FIG. 2 shows the shape of the outer surface of the end bracket 7. Reference numeral 7a denotes the above-mentioned recess, around which is provided a protrusion 7b which occupies approximately 1/3 of the outer surface, and the remainder 7c is as low as the recess 7a. A pair of claw pieces 3b, 3c are provided at the open end of the housing 3, and recesses 7d, 7e for accommodating the claw pieces are also provided in the end bracket 7. The jack portion 9a of the terminal fitting 9 covers one of the through holes of the end bracket 7 in the shape of an eyelet fitting, and the terminal piece portion 9b is inserted into the other through hole with a rectangular cross section from the inside and protrudes toward the external surface side. .

This motor has the above-described structure, and when assembled as shown in the figure, it is completed as a DC commutator motor. That is, the pair of terminal fittings 9 serve as DC terminals for power supply to the motor, and when the positive and negative terminals of the power source are connected to the terminal piece 9b, the rotor 2 is connected to the brushes 12 and 1.
3. Power is supplied through the rectifier terminal 11 to rotate.
To use this DC motor for AC operation, the rectifier 10 is fitted into the recess 7a of the bracket 7, and its DC output terminals 10a, 10b are inserted into the jack portions 9a of the pair of terminal fittings 9. AC input terminals 10c and 10d of this rectifier are projected outward from the end bracket 7. This completes the work of changing to an AC power supply, and in order to drive this motor with an AC power supply, it is sufficient to simply connect the rectifier AC input terminals 10c and 10d to the AC power supply. A circuit diagram for this AC drive is shown in FIG. In this diagram, AC indicates an alternating current power source.

As explained in detail above, according to the present invention, a small commutator motor can be extremely easily used for direct current or alternating current. has advantages.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIGS. 2 and 3 are end views and circuit diagrams thereof. In the drawing, 3 is a housing, 7a is a rectifier housing part, 9 is a pair of motor power supply DC terminals, 10 is a rectifier, 10
Reference numerals a and 10b are DC output terminals of the rectifier, 7 is an end bracket, and 9a is a jack portion.

Claims (1)

[Scope of utility model registration request] An end bracket 7 having a bearing is attached to the open end surface of the housing 3 of the small commutator motor, which has a cylindrical shape and has a bearing on one end surface 3a and the other end surface is open. A rectifier accommodating recess 7a is formed on the outer surface of the bracket, and a motor power supply DC terminal 9 having a jack portion 9a is provided, and in the case of AC use, a rectifier 10 is fitted into the recess and the DC output terminal 10a, 10b is inserted into the jack portion so that the rectifier is attached to the motor.