JP2000023408A - Motor with integral control circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a motor with an integral control circuit whose size can be compact. SOLUTION: A motor 1 and a control circuit unit are integral with each other with a common case 2. A brush holder plate 3 is attached to the brush holder case part 2a of the common case 2 and a board 4 of which the control circuit is composed is attached to the board case part 2b of the common case 2. The board 4 is provided so as to be shifted sideways from the axial direction of the motor. Relatively small components are provided near the motor 1. Relatively large components are provided at positions far from the motor 1 sideways. With this constitution, a distance between the board and the motor can be reduced to the extent to be able to accommodate the heights (thicknesses) of the relatively large components and the protruding dimension of the protruding part of the motor which is provided in order to accommodate the control circuit unit is reduced as possible, so that the motor with the integral control circuit can be attached easily to a place where the attachment is difficult from the viewpoint of layout.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor integrated with a control circuit.

[0002]

2. Description of the Related Art Conventionally, motors have been used as various drive sources. However, in a control unit provided with a control circuit for controlling the motors, the control units are usually manufactured separately from the motors and mounted. It is arranged in an appropriate place in consideration of interference with other members of the section. In recent years, attempts have been made to integrate the motor and the control unit to improve the wiring and the assemblability between the two.

[0003]

However, when the motor and the control unit are integrated as described above, it is desired that the motor and the control unit be compact in terms of the mounting space. However, the control unit is actually mounted on the motor body. It was difficult to make it compact because it was attached. Further, in the case where the control of the motor has been complicated recently, in addition to thin small parts such as electric parts for program control (CPU, memory, etc.) on the board of the control unit, a large-sized motor drive is provided. Parts (relays, capacitors, etc.)
And it is difficult to make it compact. For example, many bicycles using an electric auxiliary power unit have been proposed. In such a case, a motor or a speed reducer is mounted on a bicycle frame near the crank pedal. Therefore, the auxiliary power unit must be accommodated in the limited space within the width of the rotating crank pedal, and the control unit is integrally attached to the motor and attached to the bicycle frame as the auxiliary power unit as described above. It was difficult.

[0004]

SUMMARY OF THE INVENTION In order to solve such a problem and to realize a motor integrated with a control circuit which can be downsized, a control circuit for controlling the motor is provided in the present invention. In a control circuit-integrated motor in which the electric components constituting the motor are received together with the components of the motor in a common case, the substrate on which the electric components are mounted is placed outside a cylindrical yoke surrounding a rotor of the motor. , And a relatively large electrical component is disposed in the extended portion.

As described above, the board on which the electric components constituting the motor control circuit are mounted is provided so as to extend in the tangential direction with respect to the outer peripheral surface of the yoke of the motor, and the extended portion is provided on the side of the motor on the board. By disposing a relatively large electric component at a position protruding and away from the motor, a relatively small electric component is disposed at a portion where the board and the motor overlap and are sandwiched between the two. The distance between the substrate and the motor can be reduced as much as possible, and the radial thickness of the motor device at the portion where the substrate is provided can be suitably reduced.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to specific examples shown in the accompanying drawings.

FIG. 1 is a front view of a motor integrated with a control circuit used in a bicycle with an electric auxiliary power device to which the present invention is applied, and FIG. 2 is a sectional side view thereof. In the present motor device, as shown in the drawing, the motor 1 and its control circuit are formed in a structure integrated with each other via a common case 2.

The case 2 may be formed, for example, by casting, and has a substantially circular dish-shaped brush holder case 2a for mounting a brush holder plate 3 of a circular annular plate which is a component of the motor 1. It has a box-shaped board case portion 2b formed continuously from a part of the outer periphery of the brush holder case portion 2a and supporting and receiving the board 4 which is a component of the control circuit portion. ing.

As shown in FIG. 3, the board case 2b is a brush holder case 2 which is a front face of the motor 1.
a having an end surface substantially the same as the outer end surface of the motor 1 and extending from the end surface toward the rear end of the motor 1. Further, two surfaces of a rear end portion of the board case portion 2b corresponding to the rear end side of the motor 1 and a portion facing the outer peripheral surface of the motor 1 are formed to be open. The open surface of the rear end of the board case 2a is shielded by the rear end cover 5 in the assembled state.

A cylindrical yoke 6 with a bottom is coaxially mounted on the brush holder case 2a, and a motor rotor 7 is coaxially received in the yoke 6. The motor rotor 7 is provided in the brush holder case 2.
a and a bearing attached to the bottom of the yoke 7. A commutator 7 a is provided on the shaft of the motor rotor 7. And
At the end of the commutator 7a, a magnet 14 for detecting rotation of the motor is provided.

The above-mentioned brush holder plate 3 is attached to the brush holder case portion 2a, for example, by screwing. The brush 8 is held by a brush holder formed integrally with the brush holder plate 3. I have. In the present embodiment, four brushes 8 are provided, and a power supply plate 9 integrated with the brush holder plate 3 is provided as a power supply line to the brushes 8.

The power supply plate 9 is formed so as to be capable of supplying power to each pair of brushes 8 corresponding to each of the positive and negative poles, and is bent so as to extend radially outward from the brush holder plate 3. Power supply bar 9a formed
Are soldered to the substrate 4. Therefore, in the present motor device, the substrate 4 and the brush holder plate 3 are assembled in an integrated state via the brush power supply bar 9a. Therefore, as shown in FIG. 3, the brush holder plate 3 can also be positioned when the substrate 4 is assembled to the substrate case 2b,
Good assemblability.

In the illustrated example, the brush power supply bar 9a is formed as a brush power supply line by extending a part of the brush holder plate 3. However, the brush power supply bar 9a has thermal stress due to its plate shape. There is a possibility that it may have an adverse effect. In such a case, the substrate 4 and the brush holder plate 3 are connected to each other by using a flexible lead wire made of a normal wire.
May be electrically connected.

The control circuit of the present motor device is formed on the board 4 as described above, and each component is mounted via printed wiring formed on the board 4. The components of this motor device include a relatively small control chip C
A PU, a memory, a resistor, and the like (not shown), and a relatively large relay RY, capacitor C, and transistor FET are used. Further, in the present motor device, the number of rotations of the motor 4 is detected by a Hall element, and a sensor 10 for that purpose is soldered to the substrate 4 and connected to the end of the commutator 7a on the shaft of the motor 1. It is provided so as to extend toward the vicinity of a position corresponding to the provided magnet 14.

The electric connection between the control circuit unit and the motor 1 in the present motor device is of two systems, the above-described power supply to the brush 8 and the transmission and reception of signals to and from the Hall element. Constituting brush holder case 2a
As shown in FIG. 4, openings 1 for passing the brush power supply bar 9 a and the sensor 10 are respectively
1a and 11b are provided.

Then, the board 4 on which the electric components are mounted is assembled to the board case 2b, and the brush holder plate 3 is fixed to the brush holder case 2a, so that the yoke 6 and the brush holder case 2a are fitted to each other. Then, for example, a part of the brush holder case portion 2a is swaged to join the two, the rear end cover 5 is attached to the rear end of the substrate case portion 2b, and the substrate 4 is molded with a synthetic resin. The motor device can be assembled.

In the motor device thus configured, the substrate 4 is disposed so as to be deviated to the side of the motor 1 (to the left in FIG. 1), so that the cylindrical yoke is provided. 6, an extended portion of the substrate 4 is formed in a tangential direction, and relatively small parts (such as a control chip CPU) among the above-mentioned parts are arranged so as to be located at a position closest to the motor 1 and in the vicinity thereof. Relatively large components (relay RY, capacitor C, transistor FET) are arranged at a relatively distant side of the motor 1. The transistor FET is in contact with the substrate case portion 2b, so that the heat of the transistor FET is dissipated using the substrate case portion 2b as a heat sink. In addition, by integrating the relay RY, the capacitor C, and the like in an extended portion of the substrate 4, the wiring pattern of the substrate 4 can be divided into a control portion and a power system for driving a motor. be able to.

A large coupler 12a for connecting a power source and a small coupler 12b for inputting a signal from a pedal force detection sensor of a crank pedal are attached to the board 4 by soldering respective terminals to the board 4. In addition, a coupler insertion hole 13 is formed in the brush holder case portion 2a to allow the coupler to protrude outward. This coupler is, as shown in FIG.
And the casing of the small coupler 12b are formed by resin molding so as to be integrated with each other. Further, the large coupler 12a is arranged so as to be farther from the side of the motor 1 than the small coupler 12b.

As described above, the board 4 is made adjacent to the motor 1 along the axis thereof and extended in the tangential direction of the outer peripheral surface of the yoke 6 (biased to the side of the motor 1), and the respective electric components are mounted on the board 4. At this time, a relatively small one is arranged closer to the motor 1 and a relatively large one is
The small electric component attached to the board determines the closest distance between the outer peripheral surface of the motor 1 and the substrate 4 by the arrangement of the small electric components attached to the substrate (the outer peripheral surface of the yoke 6). Surface) can be narrowed as much as possible without hitting the surface.

For this reason, in the motor integrated with the control circuit, the axial dimension of the motor is not affected at all even if the control circuit is integrated, and even in the radial direction of the motor, the cylindrical yoke 6 of the motor 1 is not affected. Since the relatively large relay RY and the capacitor C are arranged in the space between the extended portion of the board 4 extending in the tangential direction and the outer peripheral surface of the yoke 6, the portion overlapping the yoke 6 of the board 4 is And the control circuit-integrated motor can be suitably made compact in the radial direction.

When the control circuit-integrated motor is used for a bicycle with an electric auxiliary power and the control circuit-integrated motor is mounted in such a direction that the motor axis becomes parallel to the crankshaft of the bicycle, the motor with respect to the directions of the left and right crank pedals is provided. Therefore, there is no protrusion at the portion where the control circuit is provided. Also, in the case of the control circuit integrated type motor which is made compact in the radial direction as described above,
Since relatively large components are arranged in the portion of the outer periphery of the cylindrical yoke 6 which is like a dead space, as shown in FIG. 5, the axis of the motor 1 is orthogonal to the crankshaft 15 of the bicycle, and a control circuit is provided. The projection direction of the provided portion is the crankshaft 15
Even if it is arranged in the direction along, the substrate 4 is close to the yoke 6, so that the thickness in that direction can be reduced,
Even if the width W between the left and right crank pedals 16 is restricted, the control circuit integrated motor of the present invention can be easily attached.

[0022]

As described above, according to the present invention, the board on which the electric components constituting the control circuit are mounted is provided so as to be deviated in the tangential direction with respect to the outer peripheral surface of the yoke of the motor, and the yoke is provided by the above-described deviation of the board. Since relatively large electrical components are located far away from the board, relatively small components can be placed closest to the yoke outer peripheral surface of the board, and the distance between the board and the motor is relatively small. The height (thickness) of the electrical components can be reduced to an acceptable level,
The amount of protrusion of the part provided with the control circuit that protrudes from the outer periphery of the motor can be minimized, and control is possible even in places where layout is strict with a crank pedal or frame, such as a bicycle with electric auxiliary power. A circuit-integrated motor can be easily attached. In particular, when the control circuit cannot be disposed in the axial direction of the motor and the control circuit must be disposed on the side of the motor that is radially outward of the motor, the entire motor in that direction must be disposed. This is extremely preferable because the thickness of the substrate can be made as small as possible.

[Brief description of the drawings]

FIG. 1 is a front view of a control circuit-integrated motor to which the present invention is applied.

FIG. 2 is a side sectional view taken along the line II-II in FIG. 1;

FIG. 3 is an exploded perspective view of the motor device.

FIG. 4 is a rear view of the case 2 as viewed along the arrow IV-IV line in FIG. 2;

FIG. 5 is an explanatory view showing a mounting procedure when used in a bicycle with an electric assist power.

[Explanation of symbols]

Reference Signs List 1 motor 2 case, 2a brush holder case portion, 2b substrate case portion 3 brush holder plate 4 substrate 5 rear end cover 6 yoke 7 motor rotor, 7a commutator 8 brush 9 power supply plate, 9a brush power supply bar 10 sensor 11a, 11b Opening 12a Large coupler, 12b Small coupler 13 Coupler insertion hole 14 Magnet 15 Crankshaft 16 Crank pedal

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H605 AA08 BB05 CC01 CC02 CC04 CC05 DD09 EA27 EB01 EB16 EC20 GG06 5H611 BB01 PP07 RR02 TT01

Claims (2)

[Claims] 1. A motor integrated with a control circuit, wherein an electric component constituting a control circuit for controlling the motor is received together with a component of the motor in a common case. A control circuit, characterized in that a rotator of the motor is provided outside of a cylindrical yoke surrounding the rotor and extended in a tangential direction thereof, and a relatively large electric component is disposed in the extension portion. Body motor. 2. The control circuit according to claim 1, wherein the brush holder of the motor is attached to the case and is integrally connected to the substrate via a power supply line to the brush. Body motor.