JPS61214764A - Flat motor - Google Patents

Abstract

PURPOSE:To improve the motor efficiency by detecting the magnetic flux variation due to irregular rotor magnet surface by a rotation detecting coil, thereby increasing the area of a main pole. CONSTITUTION:A flat motor is composed of face opposing rotor magnets 8, a rotor yoke 2, a shaft 3, a stator coil 4, a stator yoke 5, and a bearing 7. In this case, multipolar irregular surface is formed on the outer periphery of the magnet 8, and a rotation detecting coil 9 for detecting it and its core 10 are provided. Thus, the magnet 8 has a main magnet 8a and a rotation detecting magnet 8b, and the magnet 8b is not formed on the magnet 8a, the area of the magnet 8a can be increased to increase the output of the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF THE INVENTION The present invention relates to a flat phaser having a surface facing type [II Ui] and a coil.

Conventional technology Figure 6 shows a conventional flat phase motor. 1 is a surface-facing rotor magnet, 2 is a rotor yoke, 3 is a shaft, 4 is a stator coil, 5 is a stator yoke, 6 is a zigzag coil for rotation detection, and 7 is a bearing.

FIG. 7 shows the magnetized state of the surface facing type rotor magnet 1.

1a is a main magnet part, 1b is a rotation detection magnet part,
They are shown as 6 poles and 48 poles, respectively. Here 1. The rotor rotation detection zigzag coil 6 shown in FIG. 6 is fixed at a location facing the rotation detection magnet 1a, and the zigzag number of the zigzag pattern of the rotor rotation detection zigzag coil 6 is the number of poles of the rotation detection magnet 1b. If they are matched, an induced voltage of a cycle equal to half the number of poles of the rotation detection magnet portion 1b can be obtained from the rotor rotation detection zigzag coil 6 per one rotation of the surface-facing rotor magnet 1.

Problems to be Solved by the Invention In the above-mentioned conventional example, the 1/1 stone portion 1b for rotation detection is required, and the area of the main magnet portion 1a is correspondingly reduced, resulting in a reduction in motor output. Furthermore, since it is necessary to insert the rotation detection zigzag coil 6 between the surface-facing rotor magnet 1 and the stator coil 4, the air gear 1?
This had the disadvantage that the bulges became larger and the motor efficiency decreased.

The present invention solves the above-mentioned problems of the conventional art.
The purpose is to provide the following.

Means for Solving the Problems In order to solve the above problems, the flat electric motor of the present invention has the following features:
At predetermined positions in the radial direction of the main magnetic pole part, unevenness with an odd number times the number of rotor magnetic turrets is formed over the entire circumferential length of the N and S poles of the main magnetic pole.
A configuration comprising a rotor magnet formed to have a convex pole at the boundary with the pole, a stator coil facing the main magnetic pole surface of the rotor magnet, and a rotation detection coil facing the uneven portion of the above 〇-〇116. It was.

action ↓According to the construction acid, magnetic flux due to unevenness of 〇-ta magnet.

Since the change is detected by the rotation detection coil, the number of rotation pulses corresponding to the number of concavities and convexities of the rotor magnet can be obtained from the rotation detection coil for each rotation of the rotor 11 stones, and at the same time, the main Since there is no need to form a magnetic pole for rotation detection on the magnetic pole, the area of the main magnetic pole can be increased, so the motor output can be greatly increased, and there is no need to insert a zigzag coil for rotation detection in one gear. Since the air gap can be made smaller, the motor efficiency can be improved.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be explained based on FIGS. 1 to 5. FIG. 1 is a cross-sectional view of a flat electric motor according to an embodiment of the present invention, and the same components as those shown in FIG. 6 are given the same reference numerals and their explanations will be omitted. In FIG. 1, 8 is a rotor magnet having multipole unevenness on its outer circumference;
9 is a rotation detection coil for detecting irregularities of the rotor magnet 8, and 10 is a rotation detection coil core. FIG. 2 shows the outside of the rotor magnet 8! A Jv4 perspective view is shown. 8a is a main magnet section, and 8b is a rotation detection magnet section. FIG. 3 shows a perspective view of the outer appearance of the suator section.

Hereinafter, the operation of the above configuration will be explained using FIGS. 4 and 5. In FIG. 4, the number of unevenness of the rotation detection magnet part 8b is 3 between the poles of the main magnet part 8a.
The number is an odd number of 1!1 or more, and is shown as 5 in Fig. 4. Furthermore, the boundary between the N pole and the S pole of the main magnet portion 8a is made sure to be a convex portion.

When the relative position between the rotor magnet 8 and the rotation detection coil 9 shown in FIG. 4 is taken as a reference point, the change in the interlinkage magnetic flux φ of the rotation detection coil 9 shown by the solid line in FIG. ,2
At the position of θo, 4θ0, the rotation detection coil 9 corresponds to the convex part of the rotation detection magnet part 8b, so the maximum magnetic flux (φlaX) interlinks with the rotation detection coil 9, and at the position of θo s 3θ0, it corresponds to the concave part. Therefore, the minimum magnetic flux (φ111) interlinks. Furthermore, since the polarity of the main magnet part 8a is reversed at the position of 500 to 90o, the direction of the magnetic flux interlinking with the rotation detection coil 9 is reversed. Therefore, when the rotor magnet 8 rotates, the voltage e induced in the rotation detection coil 9 is e-dφ/dt-n (where n is the number of turns of the rotation detection coil 9), so the broken line in FIG. The voltage waveform shown is obtained. The induced voltage e in the rotation detection coil 9 is then converted into a pulse signal by a waveform shaping circuit (not shown) and used as a speed control signal for the electric motor, but this is not directly related to the present invention and will not be explained here. Omitted.

In addition, in this embodiment, the unevenness between the main magnet part 8a1 is 5.
Although the description has been made for the number of concavities and convexities, it is possible to further increase the number of cycles of the induced voltage per one rotation of the rotation detecting coil 9 by adding a greater number of concavities and convexities.

Further, in this embodiment, the rotation detection magnet portion 8b is replaced by the rotor magnet 8.
Although it is formed on the outer periphery of the stator, it is not limited to the outer periphery and may of course be provided at any position such as the inner periphery or the center as long as the rotation detection coil 9 can be fixed to the stator side. be.

In this way, in this embodiment, the rotation detection magnetic pole is not formed on the main magnetic pole as in the conventional case, and detection is performed only by the unevenness of the magnet, so that the area of the main magnet portion 8a can be increased. , the output of the motor can be increased. Furthermore, unlike conventional methods, there is no need to insert the zigzag coil 6 for detecting the rotation of the zigzag pattern into the working agisap.
The air gap can be made smaller and the efficiency of the motor can be increased.

Effects of the Invention As described above, according to the present invention, the magnetic pole for rotation detection is not formed on the main magnetic pole as in the conventional case, and detection is performed only by the unevenness of the magnet, so the area of the main magnet part can be increased. It is possible to increase the motor output. Furthermore, since there is no need to insert a zigzag coil for detecting the rotation of a zigzag pattern into the air gear 1 ship as in the prior art, the air gear 1P tube can be made smaller and the motor efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a flat electric motor according to an embodiment of the present invention, FIG. 2 is an external perspective view of a rotor magnet of a flat electric motor of the same width, and FIG. 3 is an external perspective view of a stator section of a flat electric motor of the same width.
Fig. 4 is an explanatory diagram showing the relative position of the rotor magnet and rotation detection coil of the same width flat motor, Fig. 5 is an explanatory diagram of the output voltage of the rotation detection coil of the same width flat motor, and Fig. 6 is a diagram of the conventional flat motor. FIG. 7 is a cross-sectional view of the flat type electric motor, and is an explanatory view of the magnetized state of the rotor magnet of the same width flat type electric motor. 4... Stator coil, 8... Rotor magnet, 8a.
...Main magnet section, 8b... Rotation detection magnet section, 9.
...Rotation detection coil representative Takashi Moriki No. 1II Fig. 4 Fig. 2 Fig. 3 Fig. 5flJ φ, e Fig. 2 Fig. 7

Claims (1)

[Claims] 1. A rotor magnet in which unevenness of an odd number times the number of rotor magnetic poles is formed at a predetermined position in the radial direction of the main magnetic pole surface over the entire length in the circumferential direction so as to form a convex pole at the boundary between the north and south poles of the main magnetic pole, and this rotor. A flat electric motor comprising a stator coil facing a main pole surface of a magnet, and a rotation detection coil facing an uneven portion of the rotor magnet.