JPH04134183U - Motor with frequency generator - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a motor with a frequency generator that can prevent peeling of the FG magnet due to dimensional changes, etc., and simplify the bonding process by reducing the number of times the drive magnet or FG magnet is bonded to the rotor. [Configuration] Drive magnet 6 and FG magnetized for drive
A rotor 15 having an FG magnet 8 magnetized for
and a stator equipped with a drive coil 11 and a frequency detection coil 17 corresponding to the drive magnet 6 and the FG magnet 8. The rotor is rotationally driven by energizing the drive coil, and the voltage induced in the frequency detection coil drives the rotor. The motor with a frequency generator configured to detect the rotational speed of the rotor is characterized in that the FG magnet is fixed to the rotor by a drive magnet. The FG magnet may be a plastic magnet.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a motor with a frequency generator, and particularly relates to the frequency generator (hereinafter referred to as (hereinafter referred to as "FG") relates to a magnet mounting structure.

0002

[Conventional technology]

An example of a conventional FG magnet mounting structure for a motor with a frequency generator is shown in FIG. figure 3, a shaft 37 is fixed to the center of the motor frame 36. A rotor case 33, which is cylindrical and has a dish-shaped lower part, is attached to 7 via bearings 38, 38. It is being

0003 The rotor case 33 is rotatable with respect to the shaft 37, and has a saucer-shaped portion at the bottom. A drive magnet 39 is fixed to the arc 34 and below it using adhesive. There is. Furthermore, an FG magnet 31 is attached to the lower end surface of the outer periphery of the rotor case 33. It's more fixed. The inner peripheral surface of the FG magnet 31 is the outer peripheral surface of the drive magnet 39 It is in contact with the surface.

0004 A yoke 40 is fixed on the frame 36, and a drive coil is mounted on the yoke 40. 39 is fixed. A frequency detection coil 35 is formed on the drive coil 39. The printed circuit board 41 is fixed. The above FG magnet 31 is used for the above frequency detection. It faces the output coil 35 with a gap therebetween. Reference numeral 32 indicates a yoke 34 and a drive magnet. The adhesive part with the net 39 and the adhesive part between the rotor case 33 and the FG magnet 31. show.

[0005]

[Problem that the idea aims to solve]

According to the above conventional example, the drive magnet 39 and the FG magnet are connected to the rotor case 33. Gnet 31 etc. are bonded using adhesive, so there are many bonding steps, and In addition, a plastic magnet such as nylon is used as the material for the FG magnet 31. When used, there is a problem that the adhesive may peel off due to dimensional changes due to temperature changes or moisture absorption.

[0006] This invention was devised to solve these problems, and the FG magnet In addition to preventing peeling due to dimensional changes in the rotor, the drive magnet for the rotor It is possible to simplify the bonding process by reducing the number of times FG magnets are bonded. The purpose of the present invention is to provide a motor with a wave number generator.

[0007]

[Means to solve the problem]

The present invention includes a rotor having a drive magnet and an FG magnet, and a rotor having a drive magnet and an FG magnet. The switch is equipped with a drive coil and a frequency detection coil that are compatible with magnets and FG magnets. The rotor is driven to rotate by energizing the drive coil. The rotational speed of the rotor is detected by the voltage induced in the frequency detection coil. In a motor with a frequency generator, the FG magnet is It is characterized by being fixed to the rotor.

[0008]

[Effect]

By attaching the drive magnet to the rotor, the FG magnet is fixed to the rotor. It will be worn. The material of the FG magnet is plastic, and its dimensions may change due to temperature changes, etc. Even if the FG magnet is fixed to the rotor by the drive magnet, it will not fall off. has been done.

[0009]

【Example】

Please refer to the drawings below for examples of the motor with a frequency generator according to the present invention. I will explain. In FIG. 1, a shaft 1 is fitted and fixed in a hole in the center of a frame 12. . A rotor case 4 is fixed to the shaft 1 via two bearings 3, 3. rotor The case 4 is rotatably supported with respect to the shaft 1 via bearings 3, 3.

0010 The rotor case 4 is cylindrical and has a lower part shaped like an upside-down dish. A yoke 9 is fixed to the ceiling surface with screws 5. Lower outer peripheral edge of rotor case 4 The FG magnet 8 is fitted in the FG magnet 8. The FG magnet 8 has an inward facing flap at the top end. It has a flange 8a and an outward flange 8b at its lower end. one inward flan The yoke 8a is in contact with the ceiling surface of the dish-shaped portion of the rotor case 4, and is in contact with the ceiling surface of the yoke 9. The other outward flange 8b is in contact with the outer circumferential surface of the rotor case 4. It is in contact with the lower end surface of the edge.

[0011] A driving magnet 6 is bonded to the lower surface of the yoke 9. driving magnet If rare earth magnets are used as the material in step 6, there will be no dimensional change and there is no risk of peeling. Less risky. Also, since the drive magnet 6 has a strong magnetic force, the yoke 9 and the drive magnet This also prevents the risk of peeling off due to the suction force with the net 6. driving magnet By gluing 6 as above, the inward flange of FG magnet 8 8a is inserted between the rotor case 4 and the drive magnet 6. Therefore, if Even if the dimensions of the FG magnet 8 change due to temperature changes, etc., the rotor case There is no need to worry about it coming off from 4, and the number of adhesive points can be reduced to one.

0012 A yoke 10 is mounted on the frame 12 around the shaft 1 mounting portion. yoke A drive coil 11 is attached on top of 10. Above the drive coil 11 is a frequency A number detection board 16 is attached. Frequency detection board 16 is attached to rotor case 4 It faces the driven magnet 6 with a gap therebetween. To the frequency detection board 16 A frequency detection coil 17 is formed, and the frequency detection coil 17 is connected to the rotor case. It faces the FG magnet 8 attached to the base 4 with a gap therebetween. frame 1 2. The stator of the motor is composed of the drive coil 11, frequency detection board 16, etc. ing.

[0013] As with conventional general motors, the drive magnet 6 is magnetized for driving, and the FG magnet The net 8 is magnetized for frequency power generation. Rotor case 4, yoke 9, drive motor The magnet 6, the FG magnet 8, and the like constitute a rotor 15 that rotates integrally.

[0014] The drive coil 11 is energized and the drive coil 1 is energized according to the rotational position of the rotor 15. By switching the energization to the rotor 1, the rotor 15 can be rotationally driven. Ma In addition, as the FG magnet 8 rotates together with the rotor 15, the rotation of the rotor 15 is increased. A frequency signal corresponding to the rolling speed is induced in the frequency detection coil 17. Frequency detection The frequency signal induced in the coil 17 is generally converted to a voltage. Therefore, this voltage The rotational speed of the rotor 15 can be detected from the signal.

[0015] Next, the embodiment shown in FIG. 2 will be described. In FIG. 2, the rotor case 21 is It has a cylindrical shape like the embodiment shown in FIG. A recess is provided for attaching a cut 26. Yoke on the recessed ceiling part 22 are arranged and fixed to the rotor case 21 with screws 27. yoke 22 A drive magnet 24 with an outward flange 24a is attached below. . A mounting hole is provided through the drive magnet 24 and the yoke 22, and these mounting holes are provided. By screwing the screw 25 inserted into the hole into the rotor case 21, the yoke 2 2 and a drive magnet 24 are fixed to the rotor case 21.

[0016] The outer periphery of the drive magnet 24 and the inner surface of the rotor case 21 are provided on the lower surface side of the yoke 22. An FG magnet 26 is attached between the periphery and the periphery. FG magnet 2 An inward flange 26a is provided on the upper end side of 6. Install FG magnet 26 When the flange 26a of this FG magnet 26 and the drive magnet 24 Combine the flange and 24a. That is, the flange of the drive magnet 24 and 24a to press the flange 26a of the FG magnet 26 toward the yoke 22. Ru. The FG magnet 26 is a drive magnet 24 fixed to the rotor case 21. Because it is supported by It is.

[0017] Note that in FIG. 2, reference numeral 28 indicates a rotor. The rotor 28 is a rotor It consists of a base 21, a drive magnet 24, an FG magnet 26, and the like. Also, the drive The magnet 24 faces a drive coil 29 that constitutes a part of the stator, and the FG The lower end surface of the magnet 24 faces the frequency detection coil 23.

[0018] According to the embodiment shown in FIG. 2, the drive magnet 24 and the FG magnet 26 are No adhesive process is required for fixing it to the data case 21. Also, the driving magnet 24 to the rotor case 21, the FG magnet 26 becomes the drive magnet. Since the net 24 and the rotor case 21 are sandwiched and fixed, The dimensions of the FG magnet 26 change due to changes in temperature, etc., and the FG magnet 26 is rotated. Even if the FG magnet 26 is separated from the rotor case 21, It will not fall off.

[0019]

[Effect of the idea]

According to the present invention, in a motor with a frequency generator, the FG magnet is a drive magnet. Because it is fixed to the rotor with a net, the FG magnet and drive magnet Eliminate the gluing process or reduce the number of gluing processes when fixing the net to the rotor. It is possible to change the size of the FG magnet material due to temperature changes, etc. Even if you use a large plastic magnet, the FG magnet is the rotor. It will not fall off.

[Brief explanation of drawings]

FIG. 1 is a sectional front view showing an embodiment of a motor with a frequency generator according to the present invention.

FIG. 2 is a sectional front view showing another embodiment of a motor with a frequency generator according to the present invention.

FIG. 3 is a cross-sectional front view showing an example of a conventional motor with a frequency generator.

[Explanation of symbols]

6 Drive magnet 8 FG magnet 11 Drive coil 15 Rotor 17 Frequency detection coil 23 Frequency detection coil 24 Drive magnet 26 FG magnet 28 Rotor 29 Drive coil

Claims (2)

[Scope of utility model registration request] 1. A rotor having a drive magnet magnetized for driving and a frequency generator magnet magnetized for frequency power generation, and a drive coil and a frequency detection coil corresponding to the drive magnet and the frequency generator magnet. In a motor with a frequency generator, the rotor is rotationally driven by energizing the drive coil, and the rotational speed of the rotor is detected by a voltage induced in the frequency detection coil. A motor with a frequency generator, characterized in that the frequency generator magnet is fixed to the rotor by the drive magnet. 2. The motor with a frequency generator according to claim 1, wherein the frequency generator magnet is made of a plastic magnet.