JP2008148420A - Claw pole permanent magnet motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a claw pole permanent magnet motor united with a printed wiring board which can be thinned more in its axial direction while improving the moter performance. <P>SOLUTION: It is constituted so that a printed wiring board 5 equipped with a driving circuit including electronic parts 52 and a motor mounting board 6 may stick close fast to the axial end face of the stator 4 of a claw pole permanent magnet motor 1 where a coil end does not exist. Hereby, further thinnnig is achieved in a board-integrated permanent magnet, and the heat radiation effect of the electronic parts 52 on the printed wiring board 5 improves. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a claw pole type permanent magnet motor.

  A permanent magnet comprising a stator formed by winding a coil around teeth of a stator core formed by laminating electromagnetic steel sheets, and a rotor configured by installing permanent magnets at equal intervals on the outer periphery of the rotor core. In a motor, an integral structure with a printed wiring board provided with a drive circuit is already known, for example, in Patent Document 1.

Japanese Patent Laid-Open No. 10-108434

  The integrated structure of the printed wiring board provided with the drive circuit and the permanent magnet motor contributes to miniaturization of the motor including the printed wiring board. However, in the case of a motor structure as described in Patent Document 1 above, because it includes a stator configured by winding a coil around teeth of a stator core formed by laminating electromagnetic steel sheets, Naturally, a coil end portion is formed. The coil end portion causes an increase in the axial length of the motor, and even if the printed wiring board and the permanent magnet motor are integrally formed, it becomes an obstacle to thinning in the axial direction.

  Accordingly, an object of the present invention is to achieve further reduction in thickness in the axial direction while improving motor performance in a permanent magnet motor integrated with a printed wiring board.

  In a permanent magnet motor integrated with a printed wiring board, a claw pole type permanent magnet motor is used as the permanent magnet motor. A printed wiring board having a drive circuit on the axial end surface of the claw pole type permanent magnet motor, and a motor mounting plate The structure is arranged in close contact with each other.

  By adopting a structure in which the printed wiring board with the drive circuit and the motor mounting plate are arranged in close contact with the axial end face of the claw pole type permanent magnet motor in this way, while improving the motor performance, It is possible to obtain a claw pole type permanent magnet motor integrated with a printed wiring board that is thinner than the above configuration.

  Embodiments will be described below with reference to the drawings.

  Hereinafter, an embodiment of a claw pole type permanent magnet motor 9 integrated with a printed wiring board according to the present invention will be described. As a first embodiment, a single-phase abduction type claw pole type permanent magnet motor 1 is given. As shown in FIG. 1, the claw pole type permanent magnet motor 1 is roughly composed of a rotor 3 formed on a rotary shaft 2 and a fixedly installed concentrically with respect to the rotor 3 via a radial gap. It consists of a child 4. Although not shown in FIG. 1, the stator 4 is supported by a bearing holder 8, and bearings 7 a and 7 b are arranged at intervals in the axial direction. The bearings 7 a and 7 b support the rotary shaft 2. Support for rotation.

  As shown in FIGS. 1 and 3, the rotor 3 is fixed to the rotor core 31, a rotor core 31 formed in a cup shape, a plurality of permanent magnet poles 32 arranged on the inner periphery thereof, and the rotor core 31. And a rotating shaft 2 extending in the axial direction.

  The stator 4 includes a stator iron core 41 and an annular coil 42 wound around the stator iron core 41. The stator iron core 41 includes a first stator iron core 41a as shown in FIG. And the second stator core 42b, and the annular coil 42 is sandwiched between the first stator core 41a and the second stator core 42b as shown in FIG.

  The first stator core 41a and the second stator core 41b extend in the axial direction to an inner peripheral core portion 46 supported by the bearing holder 8, and extend from the inner peripheral core portion 46 to the outer diameter side. And a claw magnetic pole 43 extending from the radial iron core 45 in the same direction as the inner circumferential core 46, and the claw magnetic pole 43 is opposed to the rotor 3 through a gap. The claw magnetic pole surface 44 is provided. The stator core 41 is configured by bringing the stator cores 41 a and 42 b configured in this way so that the claw magnetic poles 43 are engaged with each other so as to sandwich the annular coil 42.

  The first stator core 41a and the second stator core 42b are preferably formed by laminating silicon steel plates having excellent magnetic properties. However, when the claw magnetic pole 43 is difficult to form, rolling such as SPCC is performed. It can be formed by bending a steel plate. However, if the claw magnetic pole 43 is formed by bending, the problem of becoming an inefficient motor by causing further deterioration of the magnetic characteristics due to the residual stress generated at the time of bending, and the perfect circle for the rotor 3 There is a problem that the claw magnetic pole surface 44 is likely to vary in degree. On the other hand, the first stator core 41a and the second stator core 42b that can eliminate these problems can be obtained by compression-molding the magnetic powder with the molding punch of the molding die.

  By doing so, the single-phase abduction type claw-pole permanent magnet motor 1 having no coil end is configured. In the case of a multi-phase claw pole type permanent magnet motor, the claw pole type permanent magnet motor 1 having the above-described configuration may be arranged in the axial direction while being shifted by a predetermined angle in the circumferential direction. For example, three stators 4 Are arranged in the circumferential direction while being shifted in the circumferential direction by 120 / p (number of pole pairs) in electrical angle, that is, 120 / p in mechanical angle, a three-phase claw pole type motor can be obtained. In the embodiment described below, a single-phase claw pole type permanent magnet motor is handled, but a multi-phase claw pole type permanent magnet motor having any number of phases may be used. In the following embodiments, an outer rotation type motor is dealt with, but an inner rotation type motor may be used.

FIG. 4 is a sectional view of a claw pole type permanent magnet motor 9 integrated with a printed wiring board including the drive circuit of the first embodiment. Two bearings 7a and 7b are supported on the circular inner peripheral surface of the bearing holder 8 with an interval in the axial direction, and the rotary shaft 2 is rotatably supported by the bearings 7a and 7b. A rotor iron core 31 formed in a cup shape is fixed, and a drive including a stator 4 and an electronic component 52 arranged in close contact with an axial end surface of the stator 4 on the outer peripheral portion of the bearing holder 8. A printed wiring board 5 provided with a circuit and a motor mounting plate 6 disposed in close contact with the printed wiring board 5 are fixed to form a claw pole type permanent magnet motor 9 integrated with the printed wiring board. The Here, since the claw pole type permanent magnet motor 1 does not have a coil end, it is easy to make the printed wiring board 5 adhere to the axial end face of the stator 4.

  An electronic component 52 for a drive circuit is mounted on the motor mounting plate 6 side of the printed wiring board 5, and the electronic component 52 on the printed wiring board 5 is accommodated in a recess 61 provided in the motor mounting plate 6. The wiring pattern on the printed wiring board 5 is mounted inside the printed wiring board 5. With such a configuration, a configuration in which the printed wiring board 5 and the motor mounting plate 6 are in close contact with each other is possible.

  In this way, the printed wiring board 5 is in close contact with the axial end of the stator 4, and the printed wiring board 5 and the motor mounting plate 6 are in close contact with each other. A claw pole type permanent magnet motor integrated with a wiring board can be obtained.

  Further, the heat generated from the electronic components 52 for the drive circuit disposed on the printed wiring board 5 is transmitted to both surfaces of the stator core 41 and the motor mounting plate 6 that are in close contact with the printed wiring board 5 and have good thermal conductivity. The heat is dissipated in the air. Thereby, the temperature rise due to the heat loss of the electronic component 52 is suppressed, the electronic component 52 can be mounted on the printed wiring board 5 with high density, and the printed wiring board 5 can be downsized. Therefore, it is desirable that the motor mounting plate 6 is made of a metal having good thermal conductivity. For example, aluminum can be considered. Moreover, you may use highly heat conductive resin.

  Moreover, by using a magnetic material for the motor mounting plate 6, the motor mounting plate 6 can also serve as a magnetic shield. Thereby, it is possible to prevent the magnetic field from leaking to the outside, and to minimize the influence on the external measuring instrument, electric device and the like.

Further, in order to fix the positional relationship between the printed wiring board 5 and the stator 4 in the circumferential direction, a convex portion 53 is provided on the motor side of the printed wiring board 5 as shown in FIG. As apparent from comparison with FIG. 6 showing the motor viewed from the motor mounting plate 6 side, the axial end of the first stator core 41a and the claw magnetic pole 43 belonging to the second stator core 42b. The protrusion 53 is formed so as to fit in the gap 9G existing between the two. The Hall element 51 as a magnetoelectric conversion element for detecting the magnetic pole position is disposed between the claw magnetic pole 43 belonging to the first stator core 41a and the claw magnetic pole 43 belonging to the second stator core 42b, as shown in FIG. It is mounted on the motor side of the printed wiring board 5.

  As described above, the convex portion 53 provided on the printed wiring board 5 is fitted to the stator 4 and fixed in the circumferential direction, so that the printed wiring board 5 has a positioning function with respect to the stator core 4. Therefore, it is possible to very easily arrange the Hall element 51 at an appropriate position with respect to the claw magnetic pole 43 of the stator 4. As a result, the Hall element 51 can detect the magnetic pole position of the rotor 3 and appropriately generate a motor drive signal. In patent document 1, in order to position the printed wiring board 5, the spacer for fixing the printed wiring board shown by FIG. 2 of patent document 1 to the circumferential direction is used, but a present Example Since such parts are not required, there is an advantage that there is no increase in cost.

  In the present embodiment, the wiring pattern on the printed wiring board 5 is mounted inside the board. However, when the wiring pattern on the printed wiring board 5 is mounted on the substrate surface, the wiring pattern is in close contact with the wiring pattern. What is necessary is just to insulate the stator 4 or the motor mounting plate 6.

  FIG. 7 shows a second embodiment of a claw-pole permanent magnet motor 9 integrated with a printed wiring board according to the present invention. The configuration of the claw pole type permanent magnet motor 1 is the same as that of the first embodiment, and two bearings 7a and 7b are supported on the circular inner peripheral surface of the bearing holder 8 at intervals in the axial direction. A rotary shaft 2 is rotatably supported by the bearings 7 a and 7 b, and a rotor core 31 formed in a cup shape is fixed to the rotary shaft 2, and the stator 4 and the fixed portion are fixed to the outer peripheral portion of the bearing holder 8. A printed wiring board 5 provided with a drive circuit including an electronic component 52 arranged in close contact with the axial end face of the child 4 and a motor mounting plate 6 arranged in close contact with the printed wiring board 5 are fixed. Thus, the claw pole type permanent magnet motor 9 integrated with the printed wiring board is formed.

  Here, a recess 61b is formed in the radial core portion 45 of the first stator core 41a, and the drive circuit electronic component 52 on the printed wiring board 5 is disposed on the motor side, whereby the recess 61b. Accordingly, the printed wiring board 5 can be disposed in close contact with the axial end surface of the stator 4.

  With this configuration, the stator iron core 41 is disposed in close contact with the printed wiring board 5, and further, the printed wiring board 5 is disposed in close contact with the motor mounting plate 6, so that the motor and the printed circuit board can be compared with the conventional one. The axial thickness of the integrated structure of the wiring board can be reduced.

  Here, since the first stator core 41a constituting the stator core 41 is formed by compression molding magnetic powder, providing the recess 61b in the radial core portion 45 of the first stator core 41a What is necessary is just to carry out when carrying out compression molding. This is easier than providing the motor mounting plate 6 with the recess 61 in the first embodiment.

Further, as in the first embodiment, the heat generated from the electronic component 52 for the drive circuit disposed on the printed wiring board 5 is generated by the stator core 41 and the motor having good thermal conductivity in close contact with the printed wiring board 5. It is transmitted to both surfaces of the mounting plate 6 and is radiated into the air. Thereby, the temperature rise by the heat loss of the electronic component 52 is suppressed, the electronic component 52 can be mounted on the printed wiring board 5 at high density, and the motor characteristics are improved.

  Further, as in the first embodiment, the printed wiring board 5 is formed with a convex portion so as to be fitted to the stator core 41, and thereby the stator core 41 and the printed wiring board 5 are fixed in the circumferential direction. By doing so, the Hall element 51 may be positioned so as to be disposed at an appropriate position with respect to the claw magnetic pole 43.

  By the way, in each embodiment described above, the printed wiring board 5 is disposed in close contact with the axial end surface of the stator core 41 of the claw pole type permanent magnet motor 1, and the motor is attached to the printed wiring board 5. Although the plate 6 is arranged in close contact, the positional relationship in the axial direction is arbitrary. That is, the present invention has a structure in which the motor mounting plate 6 is disposed in close contact with the axial end surface of the stator core 41 of the claw pole type permanent magnet motor 1 and the printed wiring board 5 is in close contact with the motor mounting plate 6. The effect is obtained.

  Further, in the embodiment described so far, the number of poles of the rotor 3 is four, but it goes without saying that the effect of the present invention can be obtained even if the number of poles is an even number.

The disassembled perspective view which shows the structure of the claw pole type permanent magnet motor by this invention. The disassembled perspective view which shows the structure of the stator of FIG. The disassembled perspective view which shows the structure of FIG. Sectional drawing which shows the structure of the 1st Example of the claw pole type | mold permanent magnet motor integrated with a printed wiring board by this invention. The schematic diagram which looked at the printed wiring board of Drawing 4 from the claw pole type permanent magnet motor side. The figure which added the position of Hall element to the schematic which looked at FIG. 1 from the rotating shaft direction. FIG. 5 is a view corresponding to FIG. 4 showing a configuration of a second embodiment of the claw pole type permanent magnet motor according to the present invention.

Explanation of symbols

1 Claw pole type permanent magnet motor 2 Rotating shaft 3 Rotor 4 Stator 5 Printed circuit board 6 Motor mounting plate 7a Bearing a
7b Bearing b
8 Bearing holder 9 Printed wiring board integrated claw pole type permanent magnet motor 31 Rotor core 32 Permanent magnet 41 Stator core 41a First stator core 41b Second stator core 42 Coil 43 Claw magnetic pole 44 Claw magnetic pole surface 45 Diameter Directional iron core part 46 Concave part 51 Hall element 52 Electronic component 53 Convex part 61 Concave part

Claims (9)

  A stator composed of a stator core having claw magnetic poles sandwiching an annular coil, and a permanent magnet composed of a plurality of N poles and S poles in the circumferential direction on the rotor core facing this stator via a minute gap A claw pole type permanent magnet motor comprising a rotor arranged and configured, wherein a printed wiring board having a drive circuit is in close contact with an axial end surface of the stator core. Type permanent magnet motor.   A permanent magnet composed of a plurality of N poles and S poles on a stator core having a claw magnetic pole sandwiching an annular coil and a rotor core opposed to the outer peripheral surface of the stator via a minute gap. In a claw pole type permanent magnet motor provided with a rotor arranged and arranged in the circumferential direction, a printed wiring board provided with a drive circuit is in close contact with the axial end surface of the stator core. Claw pole type permanent magnet motor.   A permanent magnet composed of a stator core having claw magnetic poles sandwiching an annular coil, and a permanent magnet composed of a plurality of N poles and S poles on a rotor core facing the inner peripheral surface of the stator via a minute gap In a claw pole type permanent magnet motor provided with a rotor arranged in a circumferential direction, a printed wiring board provided with a drive circuit is in close contact with the axial end surface of the stator core. Claw pole type permanent magnet motor. In any one of Claims 1 thru | or 3,
A claw pole type permanent magnet motor, wherein a motor mounting plate is disposed in close contact with the printed wiring board. In claim 4,
A claw pole type permanent magnet motor, wherein the motor mounting plate is formed with a recess so as to accommodate an electronic component disposed on the printed wiring board. In claim 4,
The claw pole type permanent magnet motor, wherein the motor mounting plate is made of a material having high thermal conductivity. In claim 4,
The claw pole type permanent magnet motor, wherein the motor mounting plate is made of a magnetic material. In any one of Claims 1 thru | or 7,
A claw pole type permanent magnet motor characterized in that a concave portion is formed on an end face in the axial direction of the stator so as to accommodate an electronic component disposed on the printed wiring board. In any one of Claims 1 thru | or 8,
The printed wiring board is formed with a convex portion so as to be fitted to the end face in the axial direction of the stator, and a rotational position sensor is disposed on the surface of the printed wiring board on the motor side. Claw pole type permanent magnet motor.

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