JPS5825752Y2 - Electronic governor type small DC motor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a small DC motor with an electronic governor.

As shown in FIG. 1, a conventional small DC motor with an electronic governor is equipped with an electronic speed governor 1 (electronic governor) provided outside the entire motor M via a vinyl lead wire B, or
Alternatively, as shown in FIG. 2, the structure was such that it was surrounded and integrated with a rubber-like insulator 2 and an outer case 3.

However, when the electronic speed governor 1 of FIG. 1 is attached externally, it is inconvenient to handle and difficult to incorporate into equipment, and there is a risk that the lead wires will break during transportation.

Furthermore, in the case shown in FIG. 2, a rubber-like insulator 2 is required to insulate the electronic speed governor 1, which is made up of a printed circuit board, from the motor body case, which is usually made of metal, and also serves as vibration isolation. This rubber-like insulator 2 has lead wires (not shown), so its shape is complicated, and the number of parts increases, which also poses a problem in terms of cost.

This invention aims to overcome the above-mentioned deficiencies.

Hereinafter, the configuration of this invention will be explained according to the illustrated embodiments.

In FIG. 3, a cup-shaped motor main body case 4 with a U-shaped vertical section is inside the outer cover member 3, which is an outer case.
A similar cup-shaped end bracket 5 made of synthetic resin is crimped into the opening of the motor body case 4.

The rotor 6 is attached to the shaft 7 in the motor body case 4.
A commutator 11 is fixed to the non-output side of the shaft 7, and a magnet 9 is arranged around the rotor 6. .

In addition, on the motor side of the bottom of the end bracket 5,
A non-penetrating bearing 10 for the non-output shaft that supports the non-output side end of the shaft 7 is fixed by press-fitting, and a pair of brushes 12, 12 are disposed with this non-penetrating bearing 10 in between, and the commutator 11 and rubbed it against me,
The guide portions 13, 13 of the brushes 12, 12 are protruded from the outside, and a guide portion 14 for positioning the electronic governor device is provided at the peripheral end. . . . and the speed control circuit element group 15a . Retained.

The connection between the lead-out parts 13, 13 and the governor device 15 is made by the lead-out part 1.
The tips of 3 and 13 may be soldered to the printed wiring pattern of the governor board 15b or to the lead wire of one component of the circuit element group 15a.

Note that 16 in the figure is a power supply lead.

In this invention, as described above, the governor device 15 is combined with the guide portion 14 of the end bracket 5 made of synthetic resin, and the wires are connected at the lead-out portion 13 of the brush, so that swinging of the governor device can be prevented, and the motor body case 4 , complete insulation from the outer case 3 can be achieved.

Moreover, the end bracket 5 is required to hold the governor device.
Since the material is omitted, the speed control circuit element parts group 15a...
Since it is arranged on the outside of the jacket member 3 so that the printed wiring pattern is on the inside, it is convenient to adjust, for example, a variable resistor of the above-mentioned component group from the outside of the jacket member 3 through the through hole. Further, an insulating material such as rubber can also be omitted.

At this time, since the non-through bearing 10 is provided on the side opposite to the output shaft, there is no possibility that the shaft 7 will protrude and touch the governor device, and therefore the entire motor can be constructed to be thin.

Furthermore, since the governor device 15 is wired at the lead-out portion 13 of the brush, vinyl lead wires and the like can also be omitted.

Note that the guide part to which the governor device 15 is assembled is not limited to one having a structure in which a stepped part protrudes from the peripheral end of the end bracket. You can also combine them by drilling holes.

[Brief explanation of drawings]

1 and 2 are schematic diagrams showing the structure of a conventional small DC motor, respectively, and FIG. 3 is a schematic sectional view of a main part showing the structure of an embodiment of the present invention. 3 is an outer cover member, 4 is a motor body case with a U-shaped cross section, 5
10 is a synthetic resin end bracket, 10 is a non-penetrating bearing,
12 is a brush, 13 is a lead-out section, 14 is a guide section for positioning the electronic governor device, 15 is an electronic governor device, 15a is a speed control circuit element group, and 15b is a governor board.

Claims (1)

[Scope of utility model registration request] A synthetic resin end bracket is fixed to the opening of the motor body case, which has a U-shaped longitudinal section, and a non-penetrating bearing is press-fitted into the center of the end bracket. A pair of brushes are disposed on the end bracket toward the inside of the motor, and a lead-out portion of the brushes is protruded from the outside, and a guide portion for positioning the electronic governor device is provided. An electronic governor device consisting of a speed control circuit element group and a governor board with the speed control circuit element group arranged on the outside is combined and held by connecting to the lead-out part, and these are housed in the outer cover member. A small motor with a complete electronic governor.