JPS6285657A - Motor - Google Patents

Abstract

PURPOSE:To lead out a lead wire for a driving coil simply by using adjacent strands for a frequency magnet coil as a pair of strand pairs and omitting strand pairs of the end of the strand pairs and strand pairs in which electromotive force, phase thereof differs from electromotive force obtained by the omitted strand pairs by 180 deg., is generated. CONSTITUTION:A driving coil and a circuit substrate 4 are mounted on the stator 5 side. A magnet 13 for drive, which is faced oppositely to the driving coil and multipolar-magnetized, and a frequency magneto magnet 14 are fitted to a rotor 11 axially supported to the stator 5 side. A frequency magneto coil 15 is formed at a position on the circuit substrate 4 faced oppositely to the frequency magneto magnet 14. On pair of adjacent strands for the frequency magneto coil 15 is used as a strand pair, and the strand pair at the end of the strand pairs is omitted while the strand pair from which electromotive force, which is generated by the omitted strand pair and phase thereof differs by 180 deg., is acquired is omitted.

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a motor, and is particularly suitable for constant speed rotation drive mechanisms of audio equipment, video equipment, information equipment, etc., and is suitable for frequency power generation for speed detection. This invention relates to improvements in motors equipped with devices.

(Example) Conventional frequency power generation devices for motors have a frequency power generation filter formed on the sluter side, and an opposing frequency power generation magnet placed on the rotor side.As the rotor rotates, the rotor A configuration is known that outputs a frequency signal according to the rotation speed of the motor (for example, Japanese Patent Publication No. 58-35027).
.

And, the frequency power generation coil is t'! - In order to ensure smooth rotation, it is preferable to form the entire circumference of the rotor in the rotating direction17, to improve the signal accuracy and output from the frequency power generation coil, and to further increase the frequency. From this point of view, it is common to form the frequency power generation coil on the outermost side.

For example, in the case of a brushless motor with a frequency generator, a circuit board is attached to a casing having a bearing, a magnetic core around which a drive coil is wound is attached to the casing parallel to the circuit board, and these are attached to the outer periphery of the tip of the magnetic core. A rotor having an annular driving magnet surrounding the circuit board with a slight interval is pivotally supported on the bearing part, and a frequency power generation magnet is formed in a portion of the driving magnet facing the circuit board, It has a structure in which a frequency power generation fill facing the frequency power generation magnet is formed on a circuit board.

That is, the frequency sporadic military fill is formed on the circuit board so as to surround the outer periphery of the tip of the magnetic core.

Since the drive circuit that switches and drives the drive filter is generally formed on the outside of the frequency power generation coil on the circuit board, the input/output leads of the drive coil are routed outside the frequency power generation coil to form the circuit. Connected to the board.

Specifically, in addition to directly leading the input/output leads of the drive coil to the outside of the frequency generation coil, there are two methods: connecting the input and output leads of the drive coil directly to the outside of the frequency generation coil, and connecting it to the circuit board once inside the frequency generation coil and connecting it to the frequency generation coil with a jumper wire. There are two methods: one method is to draw it out from the outside of the frequency power generation coil, and another method is to draw it out from the inside of the frequency power generation coil using a double-sided circuit board.

(c) Problems that the invention seeks to solve However,
In any of the above-mentioned configurations, the input/output leads of the drive coil and the frequency power generation coil intersect three-dimensionally, which increases the thickness in the axial direction, resulting in restrictions on miniaturization and problems with jumper wire connections. There are disadvantages that reading is required, which increases the number of man-hours, and when a double-sided circuit board is used, the cost increases significantly.

One way to solve this problem is to remove a part of the circumference of the frequency power generation fill and pull out the leads of the drive coil, but in that case, the performance of the frequency power generation coil will drop significantly. Put it away.

That is, in the frequency power generation coil, in addition to the frequency power generation signal accompanying the rotation of the rotor, an electromotive force is likely to be generated due to the leakage magnetic flux of the drive magnet. The phase sum of the electromotive force generated by the drive magnet is made to be zero by devising the structure and shape, but by removing a part of the frequency power generation funnel, the phase sum becomes zero, and the electromotive force from the drive magnet becomes zero. The signal due to the electromotive force becomes noise and causes a malfunction of the constant speed control circuit.

The present invention has been made to solve these conventional drawbacks, and even if a part of the frequency power generation coil is removed, the performance of the frequency power generation coil, especially the adverse effects from the drive magnet, can be eliminated. It is possible to maintain high performance of the frequency power generation coil.

(d) Means for Solving the Problems In order to solve these problems, the present invention arranges a driving filter and a circuit board in an annular manner on the stator side, and a rotor that is pivotally supported on the stator side. A driving magnet that faces the drive coil and is magnetized with multiple poles, and a frequency power generation magnet that is located outside the drive coil and is magnetized with multiple poles are provided. Furthermore, a frequency power generation coil formed by connecting in series a plurality of strands of strands that extend across the rotational direction of the rotor and are arranged at intervals in the rotational direction is attached to the circuit board-L. It is formed at a position facing the frequency power generation magnet, and the adjacent surface number elements are used for a pair of strands. In addition to omitting the element wire at the end of the frequency power generation coil, a element wire element is also provided which can generate an electromotive force 180 degrees opposite in phase to the electromotive force generated by the omitted element wire by rotation of the driving magnetft. This has been omitted.

(E) Effect With such a means of the present invention, as the rotor rotates, the magnetic flux of the frequency power generation magnet crosses each strand to generate an electromotive force, and a frequency power generation output corresponding to the rotation of the rotor can be obtained.

On the other hand, as the rotor rotates, an electromotive force is generated in each wire of the frequency power generation coil due to leakage magnetic flux from the drive magnet, but it is recommended that the electromotive force be omitted for wires with 180° opposite phase to each other. ), if the electromotive force from the drive magnet is canceled out in the frequency power generation coil omitted, the electromotive forces generated in the remaining wires will also cancel each other out.

(f) Example The present invention will be explained in detail below.

FIGS. 1 and 2 show one embodiment of the motor according to the present invention, and show a brushless Tanabata festival as an example.

In the second section, a flange 3 is formed on a casing 2 having a bearing part 1 such as a ball bearing or an oil-less metal, and a circuit board 4 is attached to the flange 3 so as to be stacked on top of each other. It is configured.

A magnetic core 7 integrally having a plurality of radially extending salient pole pieces 6 is attached to the circuit board 4 in the mounting 2, and a drive coil 8 is attached to each salient pole piece 6. It is divided and wound and connected to a drive circuit (not shown) formed on the circuit board 4.

A shaft 10 which is supported by a bearing part 1 of a gauging 2 is attached to the center of rotation of the rotor plate 9, and a rotor 11 is rotatably supported.

An annular driving magnet 13 is attached to the inside of the side wall 12 of the rotor plate 9 so as to surround the tip of the salient pole piece 6 at a slight distance from the tip. Drive magnet 1
3 is the first [:! ] For example, it is magnetized into four poles.

The four circuit boards vi in this driving magnet 13 are:
The multi-pole magnetized frequency power generation magnet is 1.14, and as shown in FIG. 1, it is magnetized to, for example, 16 poles.

Further, in the circuit board 4, a frequency power generation coil 15 is formed as a printed circuit in an area facing the frequency power generation magnet 14 on the outer periphery of each salient pole piece 6.

Next, this frequency power generation coil 15 will be explained in the following, but for convenience, it will be explained using FIG. 3 showing a conventional configuration.

That is, the frequency power generation coil 15 is constructed by arranging short wires 6 extending across the rotational direction of the rotor 11 in correspondence with the magnetic poles of the frequency power generation magnet 14 in the rotational direction of the key 11. 16 are connected in fU rows, and the whole is folded back into a rectangular shape to form an annular shape.

Note that the symbols A1 to A4 correspond to the north pole of the frequency power generation magnet 14, and the symbols B1 to B4 correspond to the south pole.

As shown in FIG. 1, the present invention provides a frequency power generation coil 1.
Assuming that -.al at the end of 5 is A4 and B4 for the first strand,
2, A4 and B4 for the first strand are omitted, and together with B, A2 and B2 for the second strand are also omitted. The second strands A2 and B2 are for strands located at positions where an electromotive force 180° opposite in phase to the electromotive force generated by the driving magnet 13 generated in the first strands A4 and B4 is generated.

And input/output leads from the drive coil 8 (not shown)
is derived from the omitted A4.34 portion for the first strand.

Next, the operation of the motor of the present invention will be explained.

If each strand 16 of the frequency power generation coil 15 is not omitted as shown in FIG. 3, then the drive magnet 1 in the figure
Relationship τ with the N and S poles of the lower half of 3? is each strand A
1 to A4 and B1 to B4, vector electromotive forces as shown in FIG. 4 are generated, and each electromotive force is canceled out, so that no signal is generated at the output ends P1 and B2 of the frequency power generation coil 15.

On the other hand, in the configuration of FIG. 1 according to the present invention described above, the first strands A4 and B4 are omitted (45, and 180'
``Since the strands A2 and B2, which generate electromotive forces with different phases, are also omitted, the electromotive forces of the remaining strands A1, B1, A3, and A3 cancel each other out, resulting in no output per degree Celsius.

Therefore, in addition to the wires for the - pair of wires, the wires for the silk wires may be omitted.

The motor of the present invention has a frequency power generation coil 15 and a driving magneto! - It is possible to implement not only the structure in which the coils 13 for frequency power generation and the drive magnet 13 face each other in a planar manner, but also in a structure in which the coils 15 for frequency power generation and the drive magnets 13 face each other in a planar manner, and furthermore, it can be applied to a general motor structure.

(g) As described in detail of the invention, the motor of the present invention omits the strands of wire necessary for leading out the leads of the drive coil 8, and obtains an electromotive force with a phase difference of 180 m from the strands of the omitted strands. Since the strands of wire are omitted, the leads of the drive filter 8 can be easily derived, and the space for the frequency power generation coil can be secured as much as possible, and the negative effects of leakage magnetic flux from the drive magnet can be kept to an extremely small level. can.

In addition, even if the number of poles of the drive magnet is small, if the number of poles of the frequency power generation coil is large, the number of wires to be removed can be kept to the minimum necessary, and the decrease in frequency signal output will be slight. becomes.

[Brief explanation of drawings]

1 and 2 are a schematic diagram and an interrupted front view showing the main parts of an embodiment of the motor of the present invention, FIG. 3 is a schematic diagram showing the main parts of a conventional motor, and FIGS. 4 and 5 3 is a vector diagram explaining the operation of the motor of FIG. 3 and FIG. 1. FIG. DESCRIPTION OF SYMBOLS 1... Bearing part, 2... Casing, 4... Circuit board, 5... Stator, 6... Salient pole piece, 7... Magnetic core, 8... Drive coil, 9... Rotor Plate, 1o... Rotor shaft, 11... Rotor, 13... Drive magnet, 14... Frequency power generation magnet, 15... Frequency power generation filter, 16... Element wire.

Claims (1)

[Claims] (1) A drive coil arranged in an annular manner on the stator side, a circuit board arranged on the stator side, a multipolar magnetized drive magnet facing the drive coil, and a drive magnet located on the outer periphery of the drive coil. The rotor has a multi-pole magnetized frequency power generation magnet, and a rotor is pivotally supported on the stator side, and a rotor is provided on the circuit board at a position opposite to the frequency power generation magnet, intersecting the rotational direction of the rotor. a frequency power generation coil formed by connecting in series a plurality of strands arranged at intervals in the direction of rotation, the strands extending as shown in FIG. A wire set is used, and the wire set at the end of the frequency power generation coil is omitted, and the rotation of the driving magnet generates an electromotive force that is 180° opposite in phase to the electromotive force obtained with the omitted wire set. A motor characterized in that a wire assembly is also omitted.