JPH0775276A - Dc synchronous motor - Google Patents

Abstract

PURPOSE:To improve the assembly property of a motor by. miniaturizing the motor. CONSTITUTION:A plurality of terminals 32 for connector are fixed to the outer- periphery part of one flange part 12 of a bobbin 14 and a circuit substrate 24 is supported on the bobbin 14 while a coil side connector 36 and a terminal 32 for connector are interlocked, and further a cover 26 is provided in a state so that it presses and fixes the circuit substrate 24 to the bobbin 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronous motor driven by a DC power supply, and more particularly to a DC synchronous motor having a control circuit for controlling rotation of the motor.

[0002]

2. Description of the Related Art As a DC synchronous motor of this kind, a PM type stepping motor is used and a permanent magnet type synchronous motor is driven by a DC power source.

The PM type stepping motor has a rotor having a multi-pole magnetized outer periphery and a rotor arranged outside the rotor.
The rotor and two sets of stators each having the same number of pole teeth are provided, and the two sets of stators are arranged side by side in the axial direction of the rotor, and the pole teeth are displaced from each other by ½ pitch. Further, each stator is provided with a single-phase or double-winding coil, and these coils are connected to a power source through a switching element such as a transistor. The switching element is opened and closed by a control circuit, and a constant voltage circuit is provided between the power supply and the control circuit in order to prevent fluctuations in the rotor rotation speed due to fluctuations in the power supply voltage.

In the permanent magnet type synchronous motor, only one set of stators having the same number of pole teeth is provided on the outer circumference of the rotor.
The rotor and stator poles are asymmetrical to allow rotor starting. The stator is excited by a single-phase coil, a switching element is connected to the coil, and the opening / closing of the switching element is controlled by a control circuit. Also, this motor is also provided with a constant voltage circuit in order to make the supply voltage to the control circuit constant.

[0005]

As described above, when the synchronous motor is driven at a constant rotation speed by using the DC power supply, the switching element for energizing the coil in a timely manner and the switching timing are determined. A constant voltage circuit is indispensable for keeping the number of oscillations of the control circuit constant even if the control circuit, and further the DC power supply has some voltage fluctuations. Therefore, in the case of the conventional DC synchronous motor described above, it is necessary to secure a space for accommodating the control circuit and the constant voltage circuit outside the motor main body, and as a result, there is a problem that downsizing of the device becomes difficult. . The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a DC synchronous motor that can be downsized and improve workability of assembly.

[0006]

According to the present invention, in a direct-current synchronous motor having a control circuit, a cylindrical winding drum portion around which a coil is wound and a pair of vertical winding members formed at both ends of the winding drum portion. A bobbin having a flange portion is provided, and a plurality of connector terminals are fixed to one outer peripheral portion of the pair of flange portions, and these connector terminals are connected to the coil wound around the winding drum portion. A circuit board having the control circuit is provided, a coil side connector detachably connected to the connector terminal is connected to one end of the circuit board, and the other end of the circuit board is provided. A power supply side connector for connecting to the control circuit and connected to a power supply is fixed, and one end portion of the circuit board is connected to the coil side connector and the connector terminal so that one of the bobbin Is fixed to the flange portion, the other end is supported on the other flange portion, and is characterized in that it is further pressed and fixed to the bobbin the circuit board by the cover.

The circuit board may have the control circuit, the coil side connector, and the power source side connector mounted by single-sided mounting, and the flat surface may be in contact with the inner surface of the cover. The board has the control circuit, the coil side connector, and the power source side connector mounted by single-sided mounting, and a hole into which the connector terminal can be inserted is formed in the circuit board, and the coil side is provided above the hole. A connector may be provided, and the connector terminal may be inserted into the hole and connected to the coil side connector.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 show a DC synchronous motor according to an embodiment of the present invention. In these drawings, reference numeral 2 is a substantially bottomed cylindrical casing. A rotor 4 having a rotor magnet 6 on its outer peripheral portion is rotatably provided in the central portion of the casing 2, and a bobbin 14 is fixed to the casing 2 on the outer peripheral portion of the rotor 4. The bobbin 14 includes a winding body portion 10 around which the coil 8 is wound, and a pair of flange portions 1 vertically formed at both ends of the winding body portion 10.
2 and. A yoke 16 having pole teeth is fixedly provided on the bobbin 14. A deceleration gear group 20 that sequentially transmits the rotation of the rotation shaft 18 of the rotor 4 and transmits the rotation to the motor output shaft 30 is provided in the casing 2, and the back side of the casing 2 is covered with a gear cover 22. .

A plurality of connector terminals 32 are fixed to the outer peripheral portion of one flange portion 12, and these connector terminals 32 are connected to the coil 8 wound around the winding barrel portion 10. A part of the casing 2 and the gear cover 22 is cut out, and a circuit board 24 is provided over both flange portions 12. On the circuit board 24, a plurality of electronic components 34 that form a switching element, a control circuit, a constant voltage circuit, etc. are mounted. A coil-side connector 36 detachably connected to the connector terminal 32 is provided below the one end of the circuit board 24.
6a is soldered and fixed. Further, below the other end of the circuit board 24, the power supply side connector 38 is fixed by soldering with its terminals 38a exposed on the back surface of the circuit board 24. This power supply side connector 38
Is to be connected to a circuit which the electronic component 34 comprises and to be connected to an external power source.

The circuit board 24 is supported on both flange portions 12 in a state where the coil side connector 36 and the connector terminal 32 are connected and the power source side connector 38 is brought into contact with one flange portion 12. A part of the power supply side connector 38 projects outward. A cover 26 that covers the circuit board 24 is provided outside the circuit board 24.
Is provided and is integrally fixed to the casing 2 and the gear cover 22 in a state of pressing the power source side connector 28 toward the bobbin 14.

In the DC synchronous motor having the above structure, the circuit board 24 forming the motor control system is integrally arranged on the bobbin 14, and the motor control system is separated from the motor body as compared with the conventional product. The motor is downsized. Also,
It is easy to mount the circuit board 24 on the bobbin 14,
The workability of assembly can be improved and the manufacturing cost can be reduced.

Next, another embodiment of the present invention will be described with reference to FIGS. In these figures, the same components as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted. In the DC synchronous motor shown in FIG. 3, the electronic component 34, the coil side connector 36, and the power source side connector 38 are mounted on one side of the circuit board 24. That is, the terminals of the electronic component 34 and the connectors 36 and 38 are attached to one surface of the circuit board 24 without penetrating the circuit board 24, and the circuit pattern (wiring pattern) of the circuit board 24 is also provided only on this surface. Has been. The flat surface of the circuit board 24 is in contact with the inner surface of the cover 26. According to the DC synchronous motor having such a configuration, the thickness of the substrate accommodating portion in the radial direction of the bobbin is smaller than that in the case of FIG. 1 described above, and the motor can be further downsized.

Further, in the DC synchronous motor shown in FIG. 4, the electronic component 3 is provided on one side of the circuit board 24 as in the case of FIG.
4, the coil side connector 36 and the power source side connector 38 are mounted on one side. However, the mounting surface is the surface opposite to the coil 8. In addition, a hole 40 into which the connector terminal 32 can be inserted is formed in the circuit board 24, and a coil side connector 36 is provided above the hole 40. The connector terminal 32 is inserted into the hole 40 and the coil side is provided. Connector 36
It is configured to be connected to. According to the DC synchronous motor having such a configuration, the withstand voltage between the coil and the circuit pattern is further increased, and the safety of the motor can be improved.

[0014]

As described above, according to the DC synchronous motor of the present invention, the cylindrical winding drum portion around which the coil is wound and the pair of vertical winding members formed at both ends of the winding drum portion. A bobbin having a flange portion is provided, and a plurality of connector terminals are fixed to one outer peripheral portion of the pair of flange portions, and these connector terminals are connected to the coil wound around the winding drum portion. A circuit board having a control circuit is provided, a coil side connector detachably connected to the connector terminal is connected to one end of the circuit board, and the other end of the circuit board is connected to the coil side connector. A power supply side connector for connection to a control circuit and for connection to a power supply is fixed, and one end portion of the circuit board is formed by connecting the coil side connector and the connector terminal to one flange portion of the bobbin. It is fixed and the other end is supported by the other flange, and since the circuit board is pressed and fixed to the bobbin by the cover, the circuit board is arranged integrally with the motor body, and the motor is downsized. In addition, the circuit board can be easily attached to the bobbin, the workability of assembly can be improved, and the manufacturing cost can be reduced.

When the control circuit, the coil side connector and the power source side connector are mounted on the circuit board by single-sided mounting and the flat surface is brought into contact with the inner surface of the cover, The thickness in the radial direction of the bobbin can be further reduced. Further, the control circuit, the coil side connector, and the power source side connector are mounted on the circuit board by single-sided mounting, and a hole into which the connector terminal can be inserted is formed in the circuit board, and an upper portion of the hole is formed. When the coil side connector is provided, and the connector terminal is configured to be inserted into the hole and connected to the coil side connector, the withstand voltage between the coil and the circuit pattern becomes larger, Motor safety is improved.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a DC synchronous motor according to an embodiment of the present invention.

FIG. 2 is a view from the direction of the arrow II in FIG.

FIG. 3 is a partial side sectional view of a DC synchronous motor according to another embodiment of the present invention.

FIG. 4 is a partial side sectional view of a DC synchronous motor according to another embodiment of the present invention.

[Explanation of symbols]

 10 Winding Body Part 12 Flange Part 14 Bobbin 24 Circuit Board 26 Cover 32 Connector Terminal 36 Coil Side Connector 38 Power Supply Side Connector 40 Hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Hanazumi 1-297 Kitabukuro-cho, Omiya-shi, Saitama Mitsubishi Materials Corporation Mechatronics & Production System Development Center

Claims (3)

[Claims] 1. A DC synchronous motor having a control circuit, wherein a bobbin having a tubular winding body around which a coil is wound and a pair of flange portions formed vertically at both ends of the winding body is provided. A plurality of connector terminals are fixed to one outer peripheral portion of the pair of flange portions, and these connector terminals are connected to the coil wound around the winding barrel portion, and the control circuit is connected to the coil. A circuit board having is provided,
A coil side connector that is detachably connected to the connector terminal is connected to one end of the circuit board, and a power supply side for connecting to the control circuit and a power supply is connected to the other end of the circuit board. The connector is fixed, and one end of the circuit board is fixed to one flange portion of the bobbin by coupling the coil side connector and the connector terminal, and the other end is supported by the other flange portion. The DC synchronous motor is characterized in that the circuit board is pressed and fixed to the bobbin by a cover. 2. The circuit board, wherein the control circuit, the coil side connector, and the power source side connector are mounted by single-sided mounting, and a flat surface is in contact with an inner surface of the cover. Item 1. A DC synchronous motor according to item 1. 3. The circuit board has the control circuit, the coil side connector, and the power source side connector mounted by single-sided mounting, and a hole into which the connector terminal can be inserted is formed in the circuit board. 2. The DC synchronous motor according to claim 1, wherein the coil side connector is provided above the hole, and the connector terminal is inserted into the hole and connected to the coil side connector.