JPH0715911A - Dc synchronous motor - Google Patents

Abstract

PURPOSE:To arrange a motor control system integrally with the body of a motor by providing a substrate holder at the side face of a motor, and fixing a board loaded with a control circuit, and besides, covering this board with a cover supported by the board holder. CONSTITUTION:An output terminal to a coil and a connector 6 are supported with the support 7b made at the bobbin 7 of the coil of a motor, and they project outward in the diametical direction from an opening 1a. On the other hand, a board holder 4 is fixed to the opening 1a, and a board 9 loaded with a control circuit, etc., is engaged with this board holder 4 from outside in diametrical direction. And, the board 9 is fixed inside the board holder 4, being connector to a connector 6 and an output terminal, respectively, by soldering method or the like. Furthermore, a cover 5 is provided on the surface of the board holder 4. This way, generality can be improved by fixing a motor control system compactly on the surface of the board holder 4 thereby materializing downsizing.

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 direct current power source, and more particularly to a direct current 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 type, (1)
The case of using a PM type stepping motor and the case of (2) driving a permanent magnet type synchronous motor with a DC power source will be described in order as an example.

(1) A PM type stepping motor is provided with a rotor having a multi-pole magnetized outer periphery and two sets of stators arranged outside the rotor and having the same number of pole teeth as those of the rotor. The two sets of stators are arranged side by side in the axial direction of the rotor, and their pole teeth are displaced from each other by ½ pitch. In addition, each stator has a single phase or two
Double-wound coils are provided, and these coils are connected to a power source via switching elements such as transistors. The switching circuit is opened and closed by the control circuit,
Further, 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.

(2) 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, and the magnetic poles of the rotor and the stator are made asymmetric so that the rotor can be started. There is. 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 body, and as a result, there is a problem that it is difficult to downsize the device. .

The present invention has been made in view of the above circumstances, and an object thereof is to provide a DC synchronous motor in which the device is miniaturized by disposing the motor control system integrally with the motor body.

[0007]

A direct current synchronous motor according to the present invention is a direct current synchronous motor having a control circuit, wherein a substrate holding portion is provided on a side surface of the motor, and the substrate holding portion is provided with the control circuit. The mounted substrate is fixed, and the substrate is covered with a cover supported by the substrate holding portion. Further, the substrate holding portion may be integrated with a terminal formed on the motor, or may be integrated with a bobbin that winds a coil of the motor.

[0008]

In the DC synchronous motor according to the present invention, the board on which the control circuit is mounted is fixed to the board holding portion provided on the side surface of the motor and is covered by the cover supported by the board holding portion. The control circuit can be made smaller than the conventional product that is provided separately from the motor body, and the versatility is improved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an example in which the present invention is applied to a permanent magnet type synchronous motor will be described with reference to FIGS. 1 is a plan view showing an example of a permanent magnet type synchronous motor according to the present invention, and FIG. 2 is a side view of the motor shown in FIG. Reference numeral 1 is a cup having a bottomed cylindrical shape, and a lid portion 2 is fitted into an opening formed at one end of the cup. Reference numeral 3 is an output shaft that projects from the lid portion 2 to the one end side and that rotates with the rotation of a rotor (not shown) installed in the cup 1.

An opening portion 1a is formed on the side surface of the cup 1, and a substrate holding portion 4 is fitted in the opening portion 1a. Further, the surface of the substrate holder 4 is covered with a cover 5 fitted to the substrate holder 4. Here, for example, resin or the like is used for the substrate holding portion 4 and the cover 5. Reference numeral 6 is a connector for supplying electric power to the motor, and the connector 6 penetrates the cover 5 from the opening 1a and projects outward in the radial direction.

The structure of the portion covered with the substrate holding portion 4 and the cover 5 is shown in FIG. Reference numeral 7 is a coil (not shown).
The bobbin 7 has a cylindrical shape whose both ends are expanded as shown in FIGS. 4 and 5, and the rotor is rotated in a hole 7a formed in the center thereof. It can be freely supported. A supporting portion 7b that faces the opening 1a and supports the connector 6 is formed on a part of the outer peripheral portion of the bobbin 7. As shown in FIGS. 4 and 5, an output terminal 8 to the coil is supported together with the connector 6 on the support portion 7b.
Like the connector 6, it projects radially outward from the support portion 7b.

The substrate holding portion 4 is curved along the side surface of the cup 1 as shown in FIGS. 6 and 8, and as shown in FIG. 3, the cup 1 is fitted in the locking grooves 4a formed at both ends thereof. It is fixed to the opening 1a by engaging both end edges of the side surface of the. Further, an opening 4b is formed in the central portion of the substrate holding portion 4 as shown in FIG. This opening 4
As shown in FIG. 3, the outer peripheral end of the supporting portion 7b is fitted in b, and the connector 6 and the output terminal 8 project radially outward from the surface of the substrate holding portion 4 through the opening 4b. On the other hand, the concave portions 4 for fixing the cover 5 are provided at both ends of the substrate holding portion 4.
c is formed.

Further, the connector 6 and the output terminal 8 are provided with
A board 9 on which a control circuit, a constant voltage circuit, etc. are mounted is fitted from the outside in the radial direction. As shown in FIG. 9, the substrate 9 has a flat plate rectangular shape, and a connector hole 9a for inserting the connector 6 and a terminal hole 9b for inserting the output terminal 8 are formed on the surface thereof. ing. Then, with the connector 6 inserted in the connector hole 9a and the output terminal 8 inserted in the terminal hole 9b, the connector hole 9a, the connector 6 and the terminal hole 9b are inserted.
The substrate 9 is fixed in the substrate holding portion 4 by bonding the output terminal 8 and the output terminal 8 by a method such as soldering.

Furthermore, at both ends of the cover 5, as shown in FIG.
Further, as shown in FIG. 12, a convex portion 5a is formed, and the cover 5 is fixed to the surface of the substrate holding portion 4 by engaging the convex portion 5a with the concave portion 4c of the substrate holding portion 4. Reference numeral 5b in FIG. 11 is a connector hole for projecting the connector 6 radially outward from the surface of the cover 5.

In the motor having the above structure, since the substrate 9 is fixed to the substrate holding portion 4, the motor can be downsized. Moreover, since the surface of the substrate 9 is covered with the cover 5, the substrate 9 is always protected by the substrate holding portion 4 and the cover 5, and the failure or damage of the control circuit or the like due to unnecessary contact with the substrate 9 or adhesion of dust or the like. Etc. are prevented.

Next, an example in which the present invention is applied to a PM type stepping motor will be described with reference to FIGS. 13 to 15. FIG. 13 shows an example of a PM type stepping motor according to the present invention. An opening is formed at one end of a cup 11 having a bottomed cylindrical shape, and a lid portion 12 is provided at this opening.
Are fitted. Further, reference numeral 13 is a rotary shaft of a rotor (not shown) installed in the central portion of the cup 11, reference numeral 1
Reference numeral 4 denotes an output shaft which projects from the lid portion 12 to the one end side and rotates with the rotation of the rotor. Here, the output shaft 14
Is connected to the rotary shaft 13 via a reduction gear provided in the cup 11 so as to be interlocked.

On the other hand, an opening 11a is formed on the side surface of the cup 11.
The opening 11a is covered with a cover 15, a lead wire 16 extends from the cover 15, and one end of the lead wire 16 is connected to a connector 17.

The structure of the motor is shown in FIGS. 14 and 15. Reference numeral 18 denotes a bobbin, and the bobbin 18 has expanded diameter portions 18a, 18b, 18c at both ends and a central portion, respectively.
The coil 19 is wound around the bobbin 18 with the enlarged diameter portion 18b formed in the center of the bobbin 18 interposed therebetween. A rotor 20 having a multi-pole magnetized outer periphery is coaxially and rotatably inserted into the bobbin 18 through a hole 18d formed in the center of the bobbin 18. Further, on the bobbin 18, two sets of stators 21 each having the same number of pole teeth 21a as the rotor 20 are overlapped so as to be coaxial with the rotor 20, and the pole teeth 21a are arranged on the inner peripheral surface of the bobbin 18 to be 1 It is fixed by shifting by 1/2 pitch.

A substrate holding portion 22 is integrally formed with the bobbin 18 at a part of the expanded diameter portion 18a formed at one end side of the cup 11 and the expanded diameter portion 18b formed at the central portion of the bobbin 18, respectively. Is formed in. This substrate holder 22
Faces the opening 11a, and on the outer peripheral side thereof, an end surface 22a extending in the tangential direction of the bobbin 18 and parallel to the axial direction of the bobbin 18 is formed. The output terminal 23 is integrally supported by the end surface 22a and projects outward in the radial direction.

Further, on the substrate holding portion 22, a substrate 2 having a rectangular flat plate shape and on which a control circuit, a constant voltage circuit, etc. are mounted.
4 is installed from the outside in the radial direction with the output terminal 23 inserted in the terminal hole 24a formed in the surface thereof. Then, the terminal hole 24a and the output terminal 23 are adhered to each other by a method such as soldering so that the substrate 24
Are fixed on the end face 22a. The other end of the lead wire 16 is soldered to the surface of the substrate 24 facing the outer peripheral side.

On the other hand, the cover 15 is curved along the side surface of the cup 1 and is convex outward in the radial direction.
have. Then, when the cover 15 is fitted into the opening 11a, the opening 11a is closed by the cover 15, and the substrate 24 is fitted into the substrate housing portion 15a from the radially inner side as shown in FIG. In addition, the lead wire 16
Are guided outward from the surface of the cover 15 through holes 15b formed in the back surface of the substrate housing portion 15a.

Also in the case of the motor having the above structure, the same effects as those in the case where the present invention is applied to the permanent magnet type synchronous motor can be obtained. In addition, the substrate holding portion 22 has the bobbin 18
In addition, since the output terminal 23 is integrally supported by the substrate holding portion 22, the number of components can be reduced.

[0023]

As described above, according to the DC synchronous motor of the present invention, since the motor control system is compactly fixed to the side surface of the motor, the motor control system is arranged integrally with the motor body. Therefore, the size of the motor can be reduced and the versatility of the motor can be improved as compared with the conventional product in which the motor control system and the motor body are separately provided.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a permanent magnet type synchronous motor according to the present invention.

FIG. 2 is a side view of the permanent magnet type synchronous motor of FIG.

FIG. 3 is a III-III of the permanent magnet type synchronous motor of FIG.
It is sectional drawing which followed the line.

FIG. 4 is a partial plan view taken along the arrow IV showing the shape of the bobbin of the permanent magnet type synchronous motor of FIG.

5 is a side view along the arrow V showing the shape of the bobbin of the permanent magnet type synchronous motor of FIG. 1. FIG.

6 is a plan view taken along the arrow VI showing the shape of the substrate holding portion of the permanent magnet type synchronous motor of FIG.

7 is a side view along the arrow VII showing the shape of the substrate holding portion of the permanent magnet type synchronous motor of FIG.

8 is a plan view along the arrow VIII showing the shape of the substrate holding portion of the permanent magnet type synchronous motor of FIG.

9 is a side view showing the shape of a substrate of the permanent magnet type synchronous motor of FIG. 1. FIG.

10 is a plan view along the arrow X showing the shape of the cover of the permanent magnet type synchronous motor of FIG. 1. FIG.

11 is a side view along the arrow XI showing the shape of the cover of the permanent magnet type synchronous motor of FIG.

12 is a plan view taken along the arrow XII showing the shape of the cover of the permanent magnet type synchronous motor of FIG.

FIG. 13 is a perspective view showing an example of a PM type stepping motor according to the present invention.

14 is a diagram showing the structure of the PM type stepping motor of FIG.

15 is a sectional view taken along line XV-XV showing the structure of the PM type stepping motor of FIG.

[Explanation of symbols]

 1,11 Cup 1a, 11a Opening 2,12 Lid 3,4 Output shaft 4,22 Board holding 4a Locking groove 4b Opening 4c Recess 5,5 Cover 5a Convex 5b Connector hole 6,17 Connector 7, 18 bobbin 7a, 15b, 18d hole 7b support part 8,23 output terminal 9,24 board 9a connector hole 9b 24a terminal hole 13 rotary shaft 15a board housing part 16 lead wire 18a, 18b, 18c expanded part 19 coil 20 Rotor 21 Stator 21a Pole tooth 22a End face of substrate holding part on outer peripheral side

Claims (3)

[Claims] 1. A direct current synchronous motor having a control circuit, wherein a substrate holding portion is provided on a side surface of the motor, a substrate on which the control circuit is mounted is fixed to the substrate holding portion, and the substrate is A direct-current synchronous motor, which is covered with a cover supported by the substrate holder. 2. The DC synchronous motor according to claim 1, wherein the substrate holder is integrated with a terminal formed on the motor. 3. The DC synchronous motor according to claim 1, wherein the substrate holder is integrated with a bobbin around which a coil of the motor is wound.