WO2001037405A1

WO2001037405A1 - Device for energizing dc motor

Info

Publication number: WO2001037405A1
Application number: PCT/JP1999/006454
Authority: WO
Inventors: Youichi Fujita; Sotsuo Miyoshi; Toshihiko Miyake; Satoshi Kawamura
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 1999-11-18
Filing date: 1999-11-18
Publication date: 2001-05-25

Abstract

A DC motor is used to open and close the valve of an EGR valve device. A device for energizing the DC motor includes a commutator mounted on the rotor and divided into sections to produce n phases from the direct current supplied by a power supply, and n elastic members for connecting the sections of the commutator electrically with the coils on the stator.

Description

Description DC motor current supply device Technical field

The present invention relates to a DC motor power supply device suitable for use in, for example, an EGR (Exhaust Gas Recycle) valve device for forming an exhaust gas recirculation system. Background art

As an EGR valve device, for example, one disclosed in Japanese Patent Application Laid-Open No. H10-220620 is known. This EGR valve device replaces the stepping mode previously used for valve opening and closing with a DC mode, thereby improving the resolution when adjusting the pulp opening and improving the responsiveness and reliability. In Fig. 1, 1 is a valve body, 2 is a motor case, 3 is a connector terminal, 1 is a valve that moves up and down to open and close the exhaust gas passage, and 1 2 is an opening amount according to the up and down movement of the valve 11 13 is a guide bush to prevent rotation of the brush described later, 14 is a shaft with a valve 11 attached to the lower end, 15 is a guide seal, 1 6 is a guide plate, 17 is a guide seal cover, 18 is a spring sheet, 19 is a spring that urges the shaft 14 in the closing direction of the valve 11, and 20 is a DC motor. It is evening. Reference numeral 21 denotes a hollow body having a hollow portion formed in the center, and a screw portion is formed on the inner surface of the hollow portion. 22 is a coil, 23 is a yoke, 24 is a magnet, 25 is a slide ball, and 26 is a rotor shaft. The slide ball 25 and the mouth shaft 26 form a bearing that supports the upper end of the wheel 21. 2 7 is the lower end of Rho The supporting bearing 28 is a disk-shaped commutator integrally attached to the upper end of the mouth 21. Reference numeral 29 denotes a brush spring that is attached to the inside of the motor case 2 and urges a motor brush to be described later toward the commutator 28, and 30 denotes a motor spring arranged inside the motor case 2. A brush, 31 is a motor shaft formed on the outer peripheral surface with a screw portion to be screwed with the screw portion formed in the hollow portion of the mouth 21, and 32 is a positive shaft for detecting the rotation position of the roto 21. This is a sensor.

In the EGR control device having such a configuration, the predetermined return torque in the closing direction of the valve 11 applied by the spring 19 and the valve 1 applied by the energization of the DC motor 20 The opening and closing of the knob 11 is controlled by the balance with the variable torque in the direction of rotation 1.

FIG. 2 is a longitudinal cross-sectional view showing the EGR valve device disclosed in Japanese Patent Application No. 11-1992259 filed by the present applicant. A stay core 34 formed by laminating a predetermined number of magnetic materials, and a coil 35 applied to the stay core 34 are formed integrally with a predetermined number of magnetic materials.

Reference numeral 36 denotes a flange member mounted on one end of the motor case 2, and a boss portion 36a for supporting the bearing 27a is formed at the center. 27 b is a bearing supported on the other end of the motor case 2, and is arranged coaxially with the bearing 27 a. Reference numeral 37 is supported by bearings 27a and 27b, and a plurality of permanent magnet poles 38 are provided on the outer periphery at positions corresponding to the coils 35 of the stay 33. In the evening, the motor shaft 37a protrudes from one end supported by the bearing 27a.

Numeral 40 denotes a disk fixed to the other end of the roller 37 and rotating together with the roller 37, as shown in FIG. Commutator 41 divided into n parts A split ring 42 formed by splitting is formed. Reference numeral 4 4 denotes a pair of first motor brushes whose leading ends are slidably in contact with the respective divided portions of the commutator 41 via a predetermined pressure, and reference numeral 45 denotes a leading end of each commutator 41. The second motor brush is slidably contacted through the pressure of the second motor.

Next, the operation will be described.

First, when a DC current flows from a power supply (not shown) through one of the first motor brushes 44, as shown in FIG. 2, and is supplied to the station 3 via the second motor brush 45, and after flowing through the coil 35, the second motor brush 45, the slip ring 4 2 again And the flow through the commutator 41 and to the power supply side via the other first motor brush 44. At this time, the magnetic flux generated in the coil 35 through which the current flows and the magnet 38 of the rotor 37 generate a torque in the mouth 37, and the disk 40 is also caused by the torque. Rotate. As a result, the combination of the commutator 41 with the first motor brush 44 and the divided portions of the commutator 41 is switched, and the coil through which the current flows is also switched sequentially. start.

In this continuous rotation of the row and column 37, the motor shaft 37a (31 in Fig. 1) is rotated and lowered against the biasing force of the spring (19 in Fig. 1). With the lowering of the motor shaft 37a, the shaft (14 in Fig. 1) fixed to the lower end also lowers, and the valve (11 in Fig. 1) is moved to the valve seat (1 in Fig. 1). 2) Open to. Conversely, when the power is not supplied, the torque disappears, and the valve 11 is closed by the biasing force of the spring 19.

Fig. 4 shows a DC motor energizer with a planar commutator. As another example of a DC motor energizer, a type with a cylindrical commutator is shown in Fig. 5. Shown in the figure. In Fig. 5, reference numeral 46 denotes a cylindrical alignment divided into n parts in the circumferential direction. The tip of a pair of first motor brushes 44 is slidably contacting the outer periphery of the cylindrical commutator 46. The tip of the second motor brush 45 slides on the slip ring 42 that surrounds the cylindrical commutator 46 and is divided into n portions corresponding to the divided portions of the commutator 46. Contact is possible. However, in the current-carrying device according to the prior art shown in FIGS. 4 and 5, the electrical connection between the n-divided planar commutator 41 or cylindrical commutator 46 and the coil corresponding thereto is made as shown in FIG. Since the first motor brush 44 and the second motor brush 45 and the n-split sliding spring 42 are used, there is a problem that the number of components is large.

Further, in the current-carrying device according to the prior art, there was also a problem that mechanical resistance and voltage drop occurred at the contact portion due to sliding contact between components.

The present invention has been made to solve the above-described problems, and has as its object to obtain a DC motor energizing device capable of reducing the number of components and reducing mechanical resistance and voltage drop at a contact portion. . Disclosure of the invention

The present invention relates to a direct current (DC) motor energizing device for opening and closing a valve of an EGR valve device, which is divided above in order to commutate a DC current supplied from a power source to an n phase, which is mounted above the mouth. A commutator, and divided portions of the commutator and coils corresponding to the divided portions in order to supply each current commutated to the n-phase by the commutator to each coil in the station. It has n elastic members that are electrically connected. As a result, a single elastic member is used in place of the brush and the slit that form the connection between the commutator and the coil in the conventional current-carrying device. The size can be reduced. The present invention also provides a commutator and Since the sliding contact portion has been eliminated from the connection with the coil, the mechanical resistance and the voltage drop generated at the contact portion can be reduced.

Further, in the present invention, the commutator is urged by an elastic member with a rotational urging force such that the valve closes. This ensures that the valve is closed.

Further, in the present invention, the elastic member is electrically connected to each divided portion of the planar commutator. As a result, a single elastic member is used instead of the brush and the slip ring that make up the connection between the planar commutator and the coil in the conventional energizing device. The size can be reduced.

Further, in the present invention, the elastic member is electrically connected to each divided portion of the cylindrical commutator. As a result, a single elastic member is used instead of the brush and the slip ring that form the connection between the cylindrical commutator and the coil in the conventional current-carrying device. Can be reduced in size.

In addition, the present invention makes the winding direction of the elastic member coincide with the rotation direction of the rotor, and the elastic member is reduced in diameter with the opening of the valve of the EGR valve device when energized, and is expanded when not energized. This urges the valve in the valve closing direction. As a result, the valve can be quickly closed using the return force of the elastic member, so that the responsiveness of the DC motor can be improved.

In addition, the present invention provides a method in which the winding of the elastic member and the rotation of the rotatable member are performed in opposite directions, and the elastic member expands in diameter when the valve of the EGR valve device opens when energized, and reduces in diameter when non-energized. This urges the valve in the valve closing direction. As a result, the valve can be quickly closed using the return force of the elastic member. Responsiveness can be improved.

Further, the present invention provides an insulating member provided on the surface of the elastic member.

. As a result, even if the n elastic members come into contact with each other, a short circuit does not occur, and each divided portion of the commutator and the corresponding coil can be electrically connected reliably.

Further, in the present invention, n elastic members are arranged concentrically or spirally on a commutator in a plane. This makes it possible to reduce the height of the space for disposing the elastic member, which is provided above the commutator, so that the space can be reduced in size.

Further, in the present invention, n elastic members are concentrically stacked and arranged. Thus, the predetermined number of windings of the elastic member can be achieved on a commutator having a smaller diameter, so that the current-carrying device itself can be reduced in size. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a longitudinal sectional view of a conventional EGR valve device.

FIG. 2 is a longitudinal sectional view of an EGR valve device according to the prior art.

FIG. 3 is a diagram showing a current flow of the energizing device.

FIG. 4 is a perspective view showing an example of a configuration of a DC motor power supply device according to the prior art.

FIG. 5 is a perspective view showing another example of the configuration of the DC motor power supply device according to the prior art.

FIG. 6 (A) is a plan view showing a configuration of a DC motor energizing apparatus according to Embodiment 1 of the present invention.

Fig. 6 (B) is a cross-sectional view of a part of Fig. 6 (A) taken along line X-X. Fig. 7 (A) is a DC motor power supply device according to a second embodiment of the present invention. It is a top view which shows the structure of.

FIG. 7 (B) is a cross-sectional view taken along the line X--X of FIG. 7 (A) with a partial cross section. FIG. FIG. 3 is a plan view showing a configuration.

FIG. 8 (B) is a view on arrow X--X of FIG. 8 (A).

Fig. 8 (C) is a view taken along the line Y-Y of Fig. 8 (A). BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, in order to explain this invention in greater detail, the preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Embodiment 1.

FIG. 6 (A) is a plan view showing the configuration of a DC motor current supply device according to Embodiment 1 of the present invention applied to the above-mentioned EGR valve device.

(B) is an X-X view of FIG. 6 (A) with a partial cross section. Note that among the components of the energizing device according to the first embodiment, those that are common to the components of the energizing device shown in FIGS. 3 to 5 are denoted by the same reference numerals, and description thereof will be omitted. .

The current supply device according to the first embodiment includes a planar commutator 41. In the first embodiment, the upper layer portion of the planar commutator 41 is divided into 12 parts, and the u commutator piece 41 a and the V commutator piece are clockwise as viewed in the drawing of FIG. 6 (A). 4 1 b and w commutator pieces 4 1 c are sequentially assigned. These u commutator pieces 41a, V commutator pieces 41b and w commutator pieces 41c are electrically insulated from each other, but adjacent u commutator pieces 41a that are equally spaced apart from each other. Each other, V commutator pieces 4 lb and w commutator pieces 4 1c

As shown in (B), wiring 47 a, buried under the planar commutator 41 They are electrically connected by wiring 47b and wiring 47c. Such a planar commutator 41 and a coil (not shown) are electrically connected by a mainspring panel 50 as an elastic member. That is, one end of the zener spring 50a is fixed to the first u-commutator piece 41a, and is made approximately 1 while making electrical contact with the other u-commutator pieces 41a equally spaced. The other end is fixed to a u-phase coil (not shown). One end of the mainspring panel 50b is fixed to the first V commutator piece 41b adjacent to the first u commutator piece 41a, and the other V commutators spaced at equal intervals. While making electrical contact with the piece 41b, the inside of the mainspring panel 50a is rotated about one turn, and the other end is fixed to a V-phase coil (not shown). Further, one end of the mainspring 50 c is fixed to a first w commutator 41 c adjacent to the first V commutator piece 41 b, and the other U commutator pieces 4 spaced at equal intervals. While making electrical contact with 1a, it makes about one revolution inside the mainspring panel 50b, and the other end is fixed to a u-phase coil (not shown). The mainsprings 50 a, 5 Ob and 50 c are arranged concentrically on the planar commutator 41.

An insulating coating layer (not shown) is provided on the surface of each spring panel 50a, 50Ob, and 50c to prevent short circuit due to mutual contact. Further, the winding direction of each of the springs 50a, 50b and 50c matches the rotation direction of the commutator 41 when energized.

A brush (not shown) for supplying a DC current from a power supply (not shown) is in sliding contact with the upper surface of the flat commutator 41.

Next, the operation in the case where the DC motor energizing device according to the first embodiment is applied to the EGR valve device shown in FIG. 1 will be described. First, when closing the valve of the EGR valve device, when a DC current flows from a power source (not shown) through a brush (not shown), the planar type is adjusted. The mainsprings 50a, 50b and 50c, which are rectified by the y commutator 41 and connected to the u commutator piece 41a, the V commutator piece 41b and the w Via a u-phase coil (not shown), a V-phase coil (not shown), and a w-phase coil (not shown). At this time, the magnetic flux generated by the above-mentioned coil (not shown) through which current flows and the magnet of the mouth 37 (Fig. 1, 21) generates a torque in the rotor 37, The motor shaft 37a descends while rotating with respect to evening 37, whereby the shaft (14 in Fig. 1) is depressed and the valve (11 in Fig. 1) is seated. (1 in Fig. 1). When the rotor 37 rotates, the spring 50 is entrained and reduced in diameter as the commutator 41 rotates.

Next, when closing the valve of the EGR device, when the power supply to the coil is stopped, the motor torque is lost, so the shaft 14 is raised by the biasing force of the spring 19, The valve 11 attached to the lower end of the shaft 14 closes to the seat 12. At this time, the mainspring panel 50 is unwound and expanded in diameter, and the return torque of the mainspring 50 is also used for closing the valve 11 so that the biasing force of the spring 19 can be used alone. The valve 11 can be closed more promptly than in the case, so that the responsiveness of the DC motor can be improved.

As described above, in the first embodiment, one mainspring 50 is used for connection between the commutator 41 and the coil, instead of the brush and the slip ring used in the energizing device according to the prior art. Since it is used, the number of components can be reduced, and the current-carrying device itself can be reduced in size.

Also, in the first embodiment, since the sliding contact portion is eliminated from the connection between the commutator 41 and the coil, the mechanical resistance and the voltage drop generated at the contact portion can be reduced. it can.

Further, in the first embodiment, the mainspring is divided into the respective components of the planar commutator. Since it is electrically connected to the split portion, the number of components constituting the connection portion between the planar commutator and the coil in the conventional energizing device can be reduced, and the energizing device itself can be downsized.

Further, in the first embodiment, since the mainspring 50 is arranged concentrically on the top of the planar commutator 41, the height of the mainspring panel installation space set above the commutator is reduced. Because it is possible, the space can be reduced in size.

In the first embodiment, a planar type is used as the commutator type, but a cylindrical type as shown in FIG. 5 may be used.

Further, in the first embodiment, the winding direction of the mainspring panel 50 is made to match the rotation direction of the commutator 41 when energized, but the winding direction of the mainspring 50 is set to the rotating direction of the commutator 41 when energized. May be set in the opposite direction. In this case, when the commutator 41 rotates during energization, the mainspring panel 50 expands in diameter, and when no power is applied, the motor torque disappears.Therefore, the mainspring panel 50 reduces in diameter and generates a return torque. become. As a result, the valve 11 can be closed promptly, so that the responsiveness of the DC motor can be improved. Embodiment 2

FIG. 7 (A) is a plan view showing the configuration of a DC motor energizing device according to Embodiment 2 of the present invention, and FIG. 7 (B) is a partially sectional view of FIG. 7 (A). FIG. Note that among the components of the current-carrying device according to the second embodiment, those that are common to the components of the current-carrying device shown in FIGS. 1 to 6 (A) and FIG. And the description of that part is omitted.

The energizing device according to the second embodiment is the energizing device according to the first embodiment. In contrast to this, a cylindrical commutator 46 is provided. This cylindrical commutator 46 is divided into 12 parts in the circumferential direction, and clockwise in the direction of the drawing in FIG. 7A, u commutator pieces 46 a, V commutator pieces 46 b and w Commutator pieces 46c are sequentially assigned. These u commutator pieces 46 a, V commutator pieces 46 b and w commutator pieces 46 c are electrically insulated from each other, but adjacent u commutator pieces 46 a separated at equal intervals. The V commutator pieces 46b and w commutator pieces 46c are electrically connected to each other by wiring (not shown) buried under the cylindrical commutator 46.

Such a cylindrical commutator 46 and a coil (not shown) are electrically connected by a spring panel 51. That is, one end of the mainspring panel 51a is fixed to the first u-commutator piece 46a, and is electrically connected to the other u-commutator pieces 46a that are equally spaced from each other for about 2 to 3 times. The other end is fixed to a u-phase coil (not shown). One end of the mainspring panel 51b is fixed to a first v commutator piece 46b arranged at about 120 degrees from the first u commutator piece 46a, and is equally spaced apart. It makes about 2/3 turns while making electrical contact with the other V commutator piece 46b, and the other end is fixed to a V-phase coil (not shown). In addition, one end of the mainspring 51c is fixed to a first w commutator 46c arranged at a position approximately 120 degrees from the first V commutator piece 46b, and is equally spaced apart. While making electrical contact with the other u commutator piece 46a, it turns about 2/3 times, and the other end is fixed to a u-phase coil (not shown). As a whole, the respective springs 51a, 51b and 51c are spirally arranged on the rectifier 46 in a spiral shape.

An insulating coating layer (not shown) is provided on the surface of each spring panel 51a, 51b, and 51c to prevent short circuit due to mutual contact. In addition, the winding direction of each of the mainsprings 51a, 51b and 51c matches the rotation direction of the cylindrical commutator 46 when energized. The cylindrical rectifier A brush (not shown) for supplying a DC current from a power supply (not shown) is in sliding contact with the upper surface of the child 46.

The DC motor energizing device according to the second embodiment can be suitably applied to the EGR valve device shown in FIG. 3, similarly to the DC motor energizing device according to the first embodiment.

As described above, in the second embodiment, the connection between the cylindrical commutator 46 and the coil is replaced by the brush and the slip ring used in the current-carrying device according to the prior art. Since the two mainsprings 51 are used, the number of components can be reduced, and the size of the current-carrying device itself can be reduced.

Further, in the second embodiment, since the sliding contact portion is eliminated from the connection between the cylindrical commutator 46 and the coil, the mechanical resistance and the voltage drop generated at the contact portion are reduced. be able to.

Further, in the second embodiment, since the mainspring panel is electrically connected to each of the split portions of the cylindrical commutator, the number of components constituting the connecting portion between the cylindrical commutator and the coil in the conventional energizing device is reduced. Therefore, the size of the power supply device itself can be reduced.

Further, in the second embodiment, since the mainspring 51 is arranged in a plane above the cylindrical commutator 46, the height of the mainspring panel installation space set above the commutator can be reduced. Therefore, the size of the space can be reduced. Embodiment 3.

FIG. 8 (A) is a plan view showing the configuration of a DC motor energizing apparatus according to Embodiment 3 of the present invention, and FIG. 8 (B) is a view taken along the line X_X of FIG. 8 (A). FIG. 8 (C) is a view taken along the line Y--Y of FIG. 8 (A). Note that among the components of the current-carrying device according to the third embodiment, FIGS. Components common to the components of the energizing device shown in FIGS. 7A and 7B are denoted by the same reference numerals, and description thereof will be omitted.

The feature of the third embodiment resides in that a plurality of spiral spring panels 52 are concentrically stacked on the planar commutator 41 in the current-carrying device according to the first embodiment.

The mainspring panel 52 is composed of three mainsprings 52a, 52b and 52c stacked along the axial direction of the planar commutator 41, between the mainspring 52 and the mainspring 52b. And a gap between the mainspring spring 52b and the mainspring 52c to prevent the occurrence of mechanical resistance due to mutual contact, and a tip support 52d for supporting one end of all the mainspring panels at a time. It is schematically composed of Such a planar commutator 41 and a coil (not shown) are electrically connected by a spring panel 52. That is, the tip support portion 52 d of the mainspring panel 52 is disposed on the first V commutator piece 41 b. Here, only the main spring 52 a of the main spring 52 is the first V commutator. And about two and a half turns while making electrical contact with the other V commutator pieces 41b that are electrically separated from each other and equally spaced, and the other end is a V-phase coil ( (Not shown). Similarly, the main spring panel 52b is electrically connected to the first w rectifier piece 41c adjacent to the first V commutator piece 41b, and the other w rectifiers are equally spaced. It makes about two and a half turns while making electrical contact with the sub-piece 41c, and the other end is connected to a w-phase coil (not shown). In addition, the mainspring panel 52c is electrically connected to the first u-commutator piece 41a adjacent to the first w-commutator piece 41c, and the other u-rectifiers spaced at equal intervals. It makes about two and a half turns while making electrical contact with the sub-piece 41a, and the other end is connected to a u-phase coil (not shown). An insulating coating layer (not shown) is provided on the surface of each spring panel 52a, 52b and 52c to prevent short circuit due to mutual contact. Ma Further, the winding direction of each of the springs 52a, 52b and 52c matches the rotation direction of the commutator 41 when energized. A brush (not shown) for supplying a DC current from a power supply (not shown) is in sliding contact with the upper surface of the flat commutator 41.

As described above, in the third embodiment, the mainsprings are concentrically stacked and arranged, so that a predetermined number of turns of the mainsprings can be achieved on a commutator having a smaller diameter, thereby reducing the size of the energizing device itself. In each of the above embodiments, the mainspring panel is illustrated as the elastic member, but a tubular winding panel such as a coil spring may be used. Industrial applicability

As described above, the DC motor current supply device according to the present invention reduces the number of parts by using a mainspring instead of the conventional brush and slip ring for connecting the commutator and the coil. However, the size of the power supply device itself can be reduced. Further, in the conventional energizing device, mechanical resistance and voltage drop occurred at the contact portion between the brush and the slip ring. However, in the energizing device for a DC motor according to the present invention, the above-described plurality of components were used. By replacing with a single spring panel, the above-mentioned contact portion can be reduced, so that mechanical resistance and voltage drop can be reduced. Furthermore, in the DC motor energizing device according to the present invention, the mainspring is reduced or expanded in diameter when the EGR valve device is opened when energized, and is expanded or reduced when non-energized. By setting the valve so that it is biased in the valve closing direction, the valve can be closed promptly using the return force of the mainspring, improving the responsiveness of the DC motor. It can be done.

Claims

Sought

1. A commutator that is mounted on the roof and divided to convert the DC current supplied from the power supply to the n-phase in the DC motor current supply device for opening and closing the valve of the EGR valve device. In order to supply each current, which has been converted to the n-phase by the commutator, to each coil of the main stage, a divided portion of the commutator and a coil corresponding to the divided portion are provided. An energizing device for a DC motor, comprising: n elastic members electrically connected to each other.

2. The DC motor current supplying device according to claim 1, wherein the elastic member biases the commutator with a biasing force in a rotational direction such that the valve closes.

3. The energizing device for a DC motor according to claim 1, wherein the elastic member is electrically connected to each divided portion of the planar commutator.

4. The energizing device for a DC motor according to claim 1, wherein the elastic member is electrically connected to each divided portion of the cylindrical commutator.

5. The winding direction of the elastic member and the rotating direction of the rotor coincide with each other, and the elastic member is reduced in diameter with the opening of the valve of the EGR valve device when energized, and is expanded when not energized. 2. The current supplying device for a DC motor according to claim 1, wherein the valve is biased in a valve closing direction.

6. The winding of the elastic member and the rotation of the mouth are in opposite directions, and the elastic member expands in diameter with the opening of the EGR valve device when energized, and contracts when not energized. This biases the valve in the valve closing direction. 2. The current supply device for a DC motor according to claim 1, wherein:

7. The DC motor current supplying device according to claim 1, wherein an insulating coating layer is provided on a surface of the elastic member.

8. The energizing device for a DC motor according to claim 1, wherein the n elastic members are arranged in a plane on the commutator.

9. The current supply device for a DC motor according to claim 1, wherein the n elastic members are concentrically stacked on the commutator.