JPS60141158A - Disc type brushless motor - Google Patents

Abstract

PURPOSE:To eliminate a printed board and a screw for an armature coil by molding integrally the armature coil and the side of a disc type brushless motor body with plastic mixed with magnetic powder. CONSTITUTION:A supporting ring 11' of the body side of a disc type brushless motor 1' and an armature coil 2 group are molded integrally with plastic 19. When a supporting ring 11' is formed by molding with the plastic 19, a cutout 12 and a projecting plate 11a projected on the outer periphery are simultaneously formed. A small printed board 5 is bonded on the plate 11a.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disc-type brushless motor called the so-called yo-yo type, in which two rotor yokes made of magnetic materials are fixed perpendicularly to a rotating shaft with an appropriate interval between them. This invention relates to a disk-type brushless motor in which a field magnet is fixedly installed on one of the opposing surfaces of a rotor yoke, and a stator armature consisting of a group of armature coils is arranged between the field magnet and the other rotor yoke. .

This comb motor has the advantage of eliminating iron loss and the thrust load on the shaft due to the attraction force of the field magnet.

Conventionally, as this type of disk type brushless motor 1, there is one shown in FIG. In the disc-type brushless motor 1 shown in FIG. 1, it is extremely difficult to arrange the stator armature, which consists of two groups of armature coils, between the field magnet 3 and the rotor yoke 4, which is made of a magnetic material. By adhering two groups of armature coils to 5 and fixing the substrate 5 to the case 6 of the motor 1, a stator armature consisting of two groups of armature coils was arranged at the above position. As a result, the number of parts increased, the structure became complicated, and the disc type brushless motor became expensive and unsuitable for mass production. 7 is a rotating shaft, 8 is a t i/l/V metal bearing, 9 is an upper case, 1o is a pusher 115 fixed to the rotating shaft, and a disc-shaped rotor yoke is fixed to the bush 14; 16 is a screw, 17 is a Hall element, a magnetoelectric conversion element such as a Hall IC, and 18 is a lead wire.

In addition to the above-mentioned drawbacks, such a disk drive brushless motor 1 has a gap between the coil wires of the armature coil 2 and an uneven surface, which increases the air gap in the magnetic circuit and prevents magnetic The resistance was large, the magnetic density was small, and a large rotational torque could not be obtained, making it impossible to obtain a disk-type brushless motor 1 with more efficient return motion.

The present invention has been made based on the above circumstances.

An embodiment of the present invention will be described with reference to FIG. 2 and the following figures. Note that explanations of parts common to FIG. 1 will be omitted.

FIG. 2 is a longitudinal sectional view of a disc-type brushless motor 1' as an embodiment of the present invention, and FIG. 3 is an assembled view of FIG. 2. As shown in FIG. 3, this disk-type brushless motor 1' has a support ring 11' corresponding to the support ring 11 shown in FIG. The disc-type brushless motor 1 shown in FIG. are different. That is, the present invention is characterized in that the support ring 11', which is the side surface of the main body of the disc-type brushless motor 1', and the two groups of armature coils are molded with the plastic 19 and integrated. When forming the support ring 11' by molding with the above-mentioned Glastine cube 9, the notch 12 and the protruding plate part 11a protruding to the outer periphery are also formed at the same time. A small printed circuit board 5 is bonded onto the protruding plate portion 11a. The armature coil 2 is formed by winding the conductor portions 2a and 2a', which contribute to the generated torque in the radial direction 9, so that the opening angle is 2n-1 times (n is a positive integer of 1 or more). Note that this embodiment shows an example in which n=1. In addition, since the field magnet 3 uses six poles as shown in Fig. 3, the armature coil 2
The conductor portions 2a and 2a', which contribute to the generated torque, have an opening angle of 60 degrees. Molding the armature coil 2 with the plastic 19 mixed with magnetic powder as described above simply eliminates the need for the printed circuit board 5 and screws 16, as well as the need for screwed parts, making it possible to create a disc-type brushless motor with a small outer diameter. The purpose of this invention is to obtain a highly efficient disc-type brushless motor, in addition to obtaining the following advantages: 1', reducing the number of parts, simplifying the structure, and mass producing the motor at low cost. Therefore, plastic 1 mixed with magnetic powder
9, a fine powder of a soft magnetic material kneaded with an epoxy organic binder is molded into two groups of armature coils, and is thinly molded on the surface thereof. By doing this, the surface of the armature coil 2 becomes flat, and the air gaps between the field magnet 3 and the armature coil 2 and between the rotor yoke 4 and the armature coil 2 can also be reduced. Rubbing with the magnet 3 and rotor yoke 4 can be prevented.

Furthermore, the fine powder of soft magnetic material kneaded with a binder is
Since a magnetic permeability of 3 or more can be obtained, it is possible to obtain sufficient performance for practical use by using the field magnet 3 made of a ferrite magnet, which has lower magnetic resistance and is cheaper than the armature coil 2 made of coil wire glue. It was done.

In addition, as the plastic 19 mixed with the above-mentioned magnetic powder, an example was shown in which ferrite powder was used as the magnetic powder, but the size of the powder itself is small (0,0
5 to 10μ) Since the conductivity was also poor, the occurrence of eddy current loss was hardly observed. Furthermore, in order to increase the magnetic permeability, pure iron powder may be used instead of ferrite powder.0 Figure 4? 'i is a developed view of a field magnet and armature coil in the case of 6-pole 2-phase 4-coil reciprocating energization drive. 20 is a semiconductor rectifier, 21-1 is a positive power terminal, 21-2
is a negative power supply terminal, and 17-1 and 17-2 are magnetoelectric conversion elements. The magnetoelectric conversion element 17-1, 17-2 is the N of the field magnet 3.

By detecting the magnetic pole of S, a predetermined signal is outputted so that rotational torque in a predetermined direction can be obtained, an appropriate transistor in the semiconductor rectifier 20 is driven, and a current is applied to the armature coil 2 in a predetermined direction. I am trying to energize it.

As is clear from the above, the present invention integrates the armature coil and the side surface of the disc-type brushless motor body by molding them with plastic mixed with magnetic powder, so that the printed circuit board and screws for the armature coil can be easily removed. Since there is no need for a screw-fastening part, it is possible to obtain a disc-type microb 2-circle motor with a small outer diameter. Furthermore, since the number of parts is reduced and the structure is simplified, it is possible to provide a disk-type brushless motor at a low cost and suitable for mass production. Furthermore, since there is no need to use a printed circuit board on the lower surface of the armature coil, a thin disk-type brushless motor can be obtained, and the disk-type brushless motor can easily be made entirely of resin. Furthermore, since the armature coil is molded with glass mixed with magnetic powder, magnetic resistance can be lowered and magnetic flux density can be increased, making it possible to mass-produce disk-type brushless motors with large rotational torque at low cost. effective.

7゛ As described above, the present invention has significant useful effects.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view of a conventional disc type brushless motor, Fig. 2 is a longitudinal sectional view of a disc type brushless motor according to the invention, Fig. 3 is an assembled view of Fig. 2, and Fig. 4 is a 6-pole 2 Phase 4
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Claims (1)

[Scope of Claims] 1. Two disc-shaped yokes made of magnetic material are fixed at an appropriate interval perpendicular to the rotation axis, and a field is formed on one opposing surface of the two disc-shaped yokes. An armature coil group in which a magnetic field magnet is fixedly installed, and an armature coil group is formed between the field magnet and the other disc-shaped yoke, integrally with at least the side surface of the disc-type brushless motor body, and made of plastic mixed with magnetic powder. A disc-type brushless motor characterized by arranging. 2. The armature coil is wound so that the opening angle width of the conductor portion that contributes to the generated torque is 2n-1 (n is a positive integer of 1 or more) times the magnetic pole width of the field magnet. When the armature coil is a disc-type brushless motor according to claim 1, the armature coil is molded with plastic mixed with the magnetic powder only on the surface portion thereof. When molding this cavity within the frame with plastic mixed with magnetic powder, the opening angle of the cavity within the frame of the armature coil should be set to a frame with an opening angle width equal to the magnetic pole of the field magnet. 2. A disc-type brushless motor according to claim 1, characterized in that it is formed in a shape of a shape. 4. Claim 1, characterized in that the armature coil group is arranged so as not to overlap each other.
The disc-type brushless motor according to any one of items 1 to 3.