JPS6135145A - Magnet type motor - Google Patents

Abstract

PURPOSE:To improve the motor characteristic by winding drive coils on the inner and outer peripheral surfaces of a cylindrical yoke, and disposing a cylindrical magnet coaxially with the inner and outer peripheral sides of the coil to improve the efficiency of the coil. CONSTITUTION:Drive coils 3 are toroidally wound along the axial direction of the inner and outer peripheral surfaces of a cylindrical yoke 10 to form a coil structure 1. On the other hand, cylindrical permanent magnets 6 are respectively mounted in a case 4 coaxially with the inner and outer peripheral sides of the structure 1, a plurality of poles are formed at the magnets 6 so that the poles of the same polarity area opposed to form a magnet structure 3. The structure 1, 2 are so supported to a shaft 8 as to relatively rotate to form a motor.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to the improvement of a magnet type electric motor (hereinafter referred to as a motor) that has a wide range of applications, and in particular improves the Tanabata characteristics by efficiently arranging drive coils. I have achieved this.

(Prior Art) FIG. 4 is a longitudinal sectional view showing the mechanism of a conventionally known brushless motor.

In the figure, (1) is a coil groove member, and a drive coil (3) (
A carp (hereinafter referred to as carp /L/) is provided around the circumference so that a large number of rings are connected, and these are fixed integrally to the pace (5). (2) is a magnetic structure, and the shaft (3) has a core (7) made of magnetic material.
At the same time, a cylindrical permanent magnet (6) having a plurality of magnetic poles in the circumferential direction is fixed to the outer periphery of the core (7).

The coil structure (1) and the magnet structure (2'' are connected to the bearing (9) (
The carp tv (3) is relatively rotatably supported via the permanent magnet (6), and is relatively It has a rotating structure.

In such a configuration, the coil (3) and the permanent magnet (
6) is shown in FIG. 5.

In other words, in the L-turn wire that constitutes the coil/I/(3), the parts that contribute to the motor torque are a part (8) of the outgoing path located under the Ni, and a part of the return path located under the S pole. In part (8), part (F), which is not located under any of the magnetic poles and simply electrically connects the parts (A), does not directly contribute to torque generation. Therefore, the long @) part is a waste of tension, and Koi/l/(
3) increases the electrical resistance, which becomes a cause of hindering the improvement of motor characteristics.

(Object of the Invention) In view of the above-mentioned problems, the present invention aims to improve motor characteristics by efficiently arranging the coils so as to minimize the portions of the coils that do not directly contribute to torque generation. .

(Means for Solving the Problems) The present invention provides a coil structure in which a drive coil is annularly wound in the vertical direction along the inner circumference of a cylindrical yoke, and an inner circumference of the coil structure and A pair of cylindrical permanent magnets arranged coaxially with a gap around the outer periphery and having a plurality of magnetic poles in the circumferential direction of the surface facing the coil structure, and with the same inner and outer magnetic poles facing each other with the coil structure in between. The gist of the invention is a magnet-type electric motor characterized in that a magnet structure is provided so as to rotate relative to each other.

The configuration of the present invention is applicable to various DC motors such as servo motors as well as brushless motors that do not use brushes.

The cylindrical permanent magnet may be one in which a plurality of bow-shaped permanent magnets are integrally formed in a cylindrical shape, and in addition to ferrite magnets, rare earth cobalt-based magnets, Fe BR-based permanent magnets (Japanese Patent Laid-Open No. 59-46008) are used. This makes it possible to significantly improve torque.

Also, the required number of magnetic poles for each pair of cylindrical permanent magnets is
It is desirable to select an appropriate permanent magnet according to the magnetic properties, shape and dimensions, coil characteristics, specifications, etc. of the permanent magnet, and the number of poles is an even number and the same number, and the same poles are approximately opposed to each other across the coil structure. This is desirable.

In addition, the above-mentioned coil structure and magnet structure are relatively rotatably supported by various bearings, support members for these structures, shafts, etc., but their shapes, dimensions, etc. depend on the type and characteristics of the motor. Select accordingly.

(Example) The present invention will be explained below based on the drawings shown as an example.

FIG. 1 shows an example of the case where the present invention is applied to a brushless motor, in which (A is a cross-sectional mechanical diagram thereof, and (A) is a vertical cross-sectional mechanical diagram thereof.

(1) is a coil structure in which a coil (3) is wound in an annular manner in the vertical direction along the inner circumference of a cylindrical yoke (10). The non-magnetic base (5) is fixed to the non-magnetic base (5) which is rotatably supported on the shaft (8) via the shaft.

(2) is a magnet structure and a pair of cylindrical permanent magnets (6)
(6) is fixed to a cuff-shaped cane (4) fixed to the shaft (8) so as to be coaxially arranged on both sides of the coil structure (1) with a light communication gap therebetween.

The above pair of permanent magnets (6) (6) each have a coil (
3) A plurality of magnetic poles (eight poles in the illustrated example) are provided in the circumferential direction of the opposing surface, and the same poles face each other with the coil in between.

In the above configuration, based on the signal from the rotational position detection means (not shown) of the permanent magnets (6),
By sequentially exciting the coil structure (1) and the magnet structure (2), the coil structure (1) and the magnet structure (2) rotate relative to each other.

FIG. 2 is a vertical cross-sectional mechanical diagram showing an example in which the present invention is applied to a general DC monitor using a plan.

(1) is a coil structure in which a coil 1v (3) is wound in an annular manner in the vertical direction along the inner circumference of a cylindrical yoke. The cylindrical yoke 00 is fixed to a non-magnetic paste (5) which is fixed to a shaft (8). The base (5)K
is the Nulip ring α3 that comes into rotational contact with the brush @ which will be described later.
is fixed to the coil (3), and the coil (3) is provided with a current applied from outside the motor.

(2) is a magnet structure consisting of a pair of cylindrical permanent magnets (6)
(6) is a non-magnetic material that is rotatably supported on the shaft (8) via a bearing (9) so that it is coaxially arranged on both sides with a light passing gap with the coil/L/structure (1). It is stuck to the cup-down cane (4). In addition, in the case (4), there is a null ring α
A brush (2) is provided at a position where it comes into contact with.

α1) C. A non-magnetic lid is used to close the opening of the cup-shaped cane (4), and at the same time the magnet structure is attached to the shaft (8).
) is rotatably supported via a bearing (9). Structure of the pair of permanent magnets (6) (6) and coil structure (1)
The relationship between the magnet structure (2) and the brushless motor (
(Fig. 1).

(Effects of the Invention) The motor of the present invention having the above configuration includes a coil (3) and a permanent magnet (
6), as shown in Figure 3, the part (G) that does not directly contribute to the generation of torque is the minimum υ, and the coil (3)
Since the permanent magnets (6) (63) are placed on both sides of the motor, the magnetic flux generated from these permanent magnets (6) (6) can be utilized most efficiently, greatly contributing to the improvement of motor customization.

In addition, the yoke αO has no magnetic gap in the circumferential direction,
Since it has a so-called slotless configuration, the torque ripple is small and the relative rotation between the coil component (1) and the magnet component (2) is effected smoothly.

[Brief explanation of drawings]

FIG. 1 is a mechanical diagram of a pressure motor according to an embodiment of the present invention, (2) is a cross-sectional view, and (CB) is a longitudinal cross-sectional view. FIG. 2 is a mechanical diagram of a DC motor according to an embodiment of the present invention, and is a vertical sectional view. FIG. 3 is an explanatory diagram of the positional relationship between the coil and the permanent magnet in the present invention. Figure 4 is a longitudinal cross-sectional view of the mechanism of a conventional Buchsire Smoke. FIG. 5 is an explanatory diagram of the positional relationship between the coil and the permanent magnet in a conventional blow-in motor. 1: Coil structure, 2: Magnet structure, 3: Coil, 8:
Shaft, 10: Yoke Figure 1 (A) (B) Figure 2 Figure 3

Claims (1)

[Claims] (1) A coil structure formed by winding a drive coil annularly in the vertical direction along the inner and outer circumference of a cylindrical yoke, and a coil arranged coaxially with a gap between the inner and outer circumferences of the coil structure. A magnet structure consisting of a pair of cylindrical permanent magnets each having a plurality of magnetic poles in the circumferential direction of a surface facing the structure and having the same inner and outer magnetic poles facing each other with a coil structure in between, is provided so as to rotate relative to the magnet structure. A magnetic electric motor characterized by