JPH0134492Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flat-faced coreless motor that uses a simple structure to prevent screw chips from entering the motor when the motor is installed.

Conventionally, motors were configured to have internal threads on the frame to attach the motor to equipment.
The female thread was installed where the inner surface of the frame was a space.

However, with this configuration, the chips generated when tightening the screws get inside the motor, hindering the rotation of the motor, and causing mechanical noise. A dustproof cover with a recess for the male screw was installed. Therefore, when installing the dustproof cover, the structure of the motor becomes complicated, leading to an increase in the number of parts.

The present invention is characterized in that it prevents chips and the like from entering the motor without providing a dustproof cover, and uses the function of the magnet, which is the main component of the motor, especially when installing the magnet.
The magnet can be attached regardless of the angular position with respect to the female thread, and one embodiment will be described with reference to FIGS. 1 to 3.

In the figure, 1 is a frame made of magnetic material, 2
is the female thread for motor mounting provided on frame 1,
3 is a magnet disposed in contact with the inner surface of the frame 1, and 4 is a recess provided in the magnet 3, which is disposed so as to correspond to the same position as the female thread 2, as shown in FIGS. 1 to 3. There is. 5 is magnet 3
A yoke 6 provided opposite to the magnet 3 is a coreless armature rotatably disposed in an axial gap 7 between the magnet 3 and the yoke 6, and is fixed to a rotating shaft 8.

With the structure described above, when the magnet 3 is mounted with screws to the mounting plate of a device that uses a motor, the recess 4 of the magnet 3 becomes a stub for the male screw, and chips are also trapped in the recess 4, unlike conventional methods. It has the same effect as the conventional one without requiring a special dustproof cover.
The structure is simplified, the number of parts is reduced, and the price is reduced.

Further, as shown in FIG. 4, the recess 4 provided in the magnet 3 is provided in an annular shape centered on the rotating shaft 8, and the position of the annular recess 4 corresponds to the position of the female thread. Since the recess 4 is provided in this way, when the magnet 3 is arranged on the inner surface of the frame, it can be assembled without paying attention to the angular position with respect to the female thread 2, making the assembly easy.

As is clear from the above explanation, according to the present invention,
It has a simple structure and is easy to assemble without using special parts such as a dustproof cover, and can reliably prevent chips and the like from entering the inside of the motor.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a flat-faced coreless motor showing an embodiment of the present invention, Fig. 2 is a plan view of a frame in the motor, Fig. 3 is a plan view of a magnet in the motor, and Fig. 4 is a plan view of a magnet in the motor. FIG. 4 is a sectional view of the magnet shown in FIG. 3; 1... Frame, 2... Female thread, 3... Magnet, 4... Recess, 8... Rotating shaft.

Claims (1)

[Scope of utility model registration request] The motor frame includes a motor frame provided with a female motor mounting thread, and a magnet fixed to the inner surface of the frame, and the magnet has an annular recess centered on the motor center axis at the same position as the female mounting thread. A flat-faced coreless motor is installed.