JPH06233514A - Oscillating motor - Google Patents

Abstract

PURPOSE:To make it possible to hold a selected position without the flow of an electric current when a totally-opened position or a totally-closed position is selected, and to save an electric power by causing the current to flow only when the current position is switched to the totally-opened position or the totally-closed position. CONSTITUTION:An oscillating motor is made up of a rotor 25 consisting of a permanent magnet, first and second winding coils 23a and 23b that are wound around stator cores positioned opposite to each other with the rotor 25 sandwiched between them, and a single fixed magnetic pole 22n provided on a stator core spaced substantially the same distance away from the first winding coil and the second winding coil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing motor capable of achieving low power consumption.

[0002]

2. Description of the Related Art Conventionally, an intake control valve is provided in each intake manifold communicating with a cylinder of an engine, and the intake control valve is provided at three positions of a fully open position, a half open position and a fully closed position according to an operating state of the engine. Japanese Patent Application Laid-Open No. 4-86326 discloses an intake control device capable of increasing and decreasing intake efficiency by performing opening / closing control so as to switch to, and preventing air amount fluctuations in a low engine speed region.

The motor for controlling the rotation of the intake control valve disclosed in this publication from the fully open position to the fully closed position is shown in FIG.
It has a structure as shown in FIG.

In FIG. 10, 10 is a motor housing, 11 is a stator core, 12n is an N pole (permanent magnet) provided on the stator core 11, and 12s is a stator at a position facing the N pole 12n. S-pole (permanent magnet) provided on the ta-core 11, 13a is a coil wound on the protrusion 14a of the stator core 11, 13b is a coil wound on the protrusion 14b provided at a position facing the protrusion 14a, and 15 is N mentioned above
Pole 12n, south pole 12s, end of protrusion 14a, protrusion 14b
Is a rotor composed of a permanent magnet that is rotatably supported by a support shaft (not shown) with a predetermined air gap between each end. In addition, the coil 13a and the coil 13b have the same winding direction, and the coil 13 on the opposite side as shown in the drawing.
a and the coil 13b are connected.

Such a motor has coils 13a, 13
In the non-excitation state in which no current is passed through b,
As shown in, the magnetic flux is generated in the stator core 11,
The south pole of the stator 15 and the north pole 12n of the stator core 11 and the rotor.
Since the N pole of the stator 15 and the S pole 12s of the stator core 11 are attracted, the stable position is achieved.

When a current is passed from the coil 13b to the coil 13a, the force which the N pole generated at the tip of the protrusion 14a and the S pole of the rotor 15 attract by the current flowing in the coil 13a and the N pole. The rotor 15 is stopped at a position where the force attracted by 12n and the S pole of the rotor 15 are balanced, as shown in FIG. As a result, the position of the rotor 15 in FIG. 12 is a position rotated 45 degrees counterclockwise from the position in FIG.

On the other hand, when a current is passed from the position shown in FIG.
Since the S pole is generated at the tip of a and the N pole is generated at the tip of the protrusion 14b, the rotor 15 moves to the position shown in FIG. 12B which is rotated 90 degrees clockwise. By the way,
The position of the rotor 15 shown in FIG.
The position of the rotor 15 shown in 2 (B) is set to + 45 °.

[0008]

By the way, the motor drive circuit shown in FIG. 10 is implemented by a bipolar drive circuit as will be described later in an embodiment of the invention. The control valve opening / closing signal is controlled so that the currents flowing through the motor are opposite when the signal is open and when it is closed. For example, when rotating the motor to the + 45 ° position,
In the period S1, a forward force is applied. Then, in the period S2, a reverse force is applied. After that, PWM control is performed to control the average voltage and current, and a predetermined fully open position (+ 45 ° position) or fully closed position (−45 ° position)
Has been realized.

By such control, the fully open position (+45
(° position) or fully closed position (-45 ° position), the current continues to flow to maintain that position, and when the current is cut off, the position returns to an intermediate position between the fully open position and the fully closed position. For this reason, there is a problem that power consumption is required to maintain the fully open position or the fully closed position.

The present invention has been made in view of the above points, and an object thereof is to maintain the position in the fully open or fully closed position without applying the current, and to allow the current to flow only when switching to the fully open or fully closed position. Thus, it is an object of the present invention to provide a swing motor capable of measuring power saving.

[0011]

According to a first aspect of the present invention, there is provided a swing motor having a rotor composed of a permanent magnet and a first stator coil wound around a rotor core which is opposed to the rotor core. And the second
And a single fixed magnetic pole provided on the stator core at a position substantially equidistant from the first winding coil and the second winding coil. And the first fixed magnetic pole and the first
It is stable between the winding coils or between the single fixed magnetic pole and the second winding coil.

According to a second aspect of the present invention, there is provided an oscillating motor having a rotor composed of a permanent magnet and first and second windings wound around a stator core at a position opposed to each other with the rotor interposed therebetween. A coil,
A single fixed magnetic pole provided on the stator core at a position substantially equidistant from the first winding coil and the second winding coil, and a current is selectively supplied to the first and second winding coils. And a drive circuit for switching the rotor between the single fixed magnetic pole and the first winding coil or between the single fixed magnetic pole and the second winding coil. Is characterized by.

The drive circuit of the swing motor according to claim 3 is a bipolar drive circuit.

The drive circuit of the swing motor according to claim 4 is a unipolar drive circuit.

[0015]

According to the present invention, when the first winding coil or the second winding coil is not energized, the rotor is provided between the single fixed magnetic pole and the first winding coil or the single fixed coil. It is stable between the magnetic pole and the second winding coil.

According to the second aspect of the present invention, since the driving circuit for selectively passing the current through the first and second winding coils is provided,
The rotor can be switched between a single fixed magnetic pole and the first winding coil or between the single fixed magnetic pole and the second winding coil.

In the third aspect, the motor can be downsized by driving the drive circuit with a bipolar drive.

In the fourth aspect, the drive circuit can be simplified by making the drive circuit a monopolar drive.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A swing motor according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of the swing motor, FIG. 2 is a magnetic circuit inside the swing motor when there is no energization, and FIG.
5 is a diagram showing the NS characteristics of the swing motor when energized, FIG. 4 is a diagram showing a bipolar drive circuit for driving the swing motor, FIG.
FIG. 6 is a diagram showing a drive waveform.

In FIG. 1, 20 is a motor housing, 21 is a stator core, and 22n is a coil 23 which will be described later.
A stator core 11 located at a substantially equidistant position from a and 23b
N pole (permanent magnet) provided on the coil 23a, a coil wound around the protrusion 24a of the stator core 21, and a protrusion 24b.
a coil wound around a protrusion 24b provided at a position facing a, 25 is the above-mentioned N pole 22n, an end portion of the protrusion 24a,
The rotor is composed of a permanent magnet that is rotatably supported by a support shaft (not shown) with a predetermined air gap from each end of the protrusion 24b. In addition, the coil 23a and the coil 2
The winding direction of 3b is the same, and the coils 23a and 23b on the opposite sides are connected as shown in the figure.

Such a motor has coils 23a, 23
In the non-energized state in which no current is passed through b, as shown in FIG.
As shown in (A) or (B), the stator core 21
Since a magnetic flux is generated in the rotor, there are two stable positions of the rotor 25 in the non-energized state.

Next, the motor bipolar drive circuit will be described with reference to FIG. In FIG. 4, reference numeral 23 is a coil obtained by combining the above-mentioned coils 23a and 23b.
One end of the coil 23 is connected to the connection point between the source electrode of the FET (field effect transistor) 31 and the drain electrode of the FET 32, and the other end of the coil 23 is connected to the connection point between the source electrode of the FET 33 and FET 34. It is connected. Further, the drain electrodes of the FETs 31 and 33 are connected to each other, and the connection point is connected to the anode of the 12V battery 35, for example. Further, the FETs 32 and 33 are
The scan electrodes are connected to each other, and the connection point is grounded.

In this way, by forming the bipolar drive circuit for driving the motor with the four FETs, only the FETs 31 and 34 are controlled to be conductive (ON) by the controller (not shown), and the coil 23 A current in the direction of the broken line is made to flow through the coil 23 by causing a current in the direction of the solid line to flow and controlling the FETs 32 and 33 to conduct (turn on).

Next, the operation of the first embodiment of the present invention constructed as above will be described. If the control valve opening / closing signal input to the controller (not shown) is closed, F
Since the ETs 31 to 34 are off, the rotor 25 is stopped at the -45 ° position as shown in FIG. 2 (A), for example. When an open signal is output to the controller (not shown) as a control opening / closing signal at the timing of time t1, the controller causes the FET transistor 31 and the FET 3 to operate.
After turning on only 4 for set time S1, FET32
Only the FET 33 and the FET 33 are turned on for the set time S2, and then all the FETs 31 to 34 are turned off. (Where S1> S2). As a result, a current flows through the coil 23 in the direction of the solid arrow, that is, a current flows through the coils 23a to 23b.

Here, the setting time S2 is set by the low
This is to prevent the overshoot of the data 25.

Therefore, as shown in FIG. 3, the protrusions 24a, 2
The tip of 4b is magnetized. Therefore, the rotor 25 is shown in FIG.
2 to the position shown in FIG. 2B.

When a "closed" signal is output from the controller at time t2, the controller turns on the FET 32.
After turning on only and 33 for set time S1, FET
Only 31 and 34 are turned on for a set time S2, and then all the FETs 31 to 34 are turned off.

Therefore, the tips of the protrusions 24a and 24b are magnetized in the opposite polarity to that shown in FIG. 3, and the rotor 25 returns from the position shown in FIG. 2 (B) to the position shown in FIG.

That is, in the non-energized state, the rotor 25
2 is stable at the position shown in FIG. 2 (A) and the position shown in FIG. 2 (B), and the position of the rotor 25 is shown in FIG. 2 (A) or FIG.
Since the excitation is performed only when the position is switched to the position (B), the power consumption can be reduced. by the way,
Considering the relationship between the power consumption of the coil, the resistance of the coil, and the volume of the coil, the power consumption of the coil usually decreases when the resistance of the coil is reduced when the number of turns of the coil is the same, but The volume of the coil increases. Therefore, it is possible to reduce the volume of the coil by reducing the reduction in power consumption to zero, so that the motor can be downsized.

Next, a unipolar drive circuit for driving the motor of the present invention will be described with reference to FIGS. 6 and 7.
FIG. 6 is a unipolar drive circuit for driving the motor of the present invention with two FETs, and FIG. 7 is a timing chart for explaining the operation.

Although the coils 23a and 23b are connected in series in FIG. 6, they are connected in parallel to the battery 35 as shown in FIG. That is, in FIG. 6, one ends of the coils 23 a and 23 b are connected to the anode of the battery 35. Coils 23a and 23
The other end of b is grounded via FETs 41 and 42, respectively. A motor input voltage from a controller (not shown) is input to the bases of the FETs 41 and 42.

If the control valve opening / closing signal input to the controller (not shown) is closed, the FETs 41 and 42 are off, so that the rotor 25 is, for example, as shown in FIG. It has stopped at the 45 ° position. When an open signal is output to the controller (not shown) as a control opening / closing signal at the timing of time t1, the controller is FE.
After turning on T42 for a set time S1, FET41
Is turned on for a set time S2, and then FET41,
42 is driven off. (Where S1> S2). As a result, a current flows through the coil 23b in the direction of the broken arrow.

Here, the setting time S2 is set by the low
This is to prevent the overshoot of the data 25.

That is, in the non-energized state, the rotor 25
2 is stable at the position shown in FIG. 2 (A) and the position shown in FIG. 2 (B), and the position of the rotor 25 is shown in FIG. 2 (A) or FIG.
Since the excitation is performed only when the position is switched to the position (B), the power consumption can be reduced. Since the unipolar drive system uses separate coils, the power consumption is doubled as compared with the bipolar drive system. Since the power consumption of the product of the present invention can be greatly reduced, it is possible to use such a unipolar drive system together, and the cost of the circuit can be greatly reduced.

Next, an example in which the motor of the present invention is applied to drive the intake control valve will be described with reference to FIGS. 8 and 9. FIG. 8 is a system configuration diagram showing an intake control device for a four-cylinder engine, and FIG. 9 is a sectional view of the intake control valve.

In FIG. 8, a four-cylinder engine 50 is provided with an intake valve 51 and an exhaust valve 51 'for each cylinder, and an intake control valve 52 is provided in an intake manifold 53 upstream of each intake valve 51. Is provided. Further, a pressure adjusting valve 55 that adjusts the intake pressure reaching each cylinder via the intake control valve 52 by the opening degree of the valve body is arranged upstream of the intake control valve 52. The pressure adjusting valve 55 and the intake control valve 52 are opened / closed by an energization signal from an input / output unit 58 of a control circuit 57 containing a computer 56. Reference numeral 59 is a read-only memory for storing the control program, and 60 is a random access memory for storing the control data.
It is a memory. The intake control valve 52 is opened / closed by an energization signal being issued at an appropriate time by calculation in the control circuit 57 which receives various signals such as the engine speed.

That is, the intake valve 51 and the exhaust valve 51 'are cam-adjusted so that the valve overlap at the time of engine high speed rotation becomes a predetermined amount, which may deteriorate the engine efficiency at the time of idle rotation. Therefore, by delaying the valve opening timing of the intake control valve 52 as the engine speed decreases, the actual overlap is reduced and the engine efficiency is prevented from decreasing.

As shown in FIG. 9, the intake control valve 52 has a butterfly type circular valve body 6 in the intake manifold 53.
1 is provided, and the circular valve body 61 is fixed to the support shaft 62 with a screw so as to swing and open / close. The open position of the circular valve body 61 is 61b, and the closed position of the circular valve body 61 is 61a.

The circular valve bodies 61a and 61b are separated from each other by 90 °, and the circular valve body 61 can be rocked by using the rotor 25 as a drive source.

In such an intake control device, the motor for opening / closing the circular valve body 61 can be downsized.

Although the stator core 21 is provided with the N pole as a single magnetic pole in the above embodiment, it may be provided with the S pole.

Further, in the above embodiment, the position from -45 ° to + 45 ° is a stable position in the non-energized state. However, depending on the number of windings of the coils 23a and 23b, the air gap, and the magnitude of the magnetic force of the N pole. It is also possible to set it at another angle.

[0043]

As described in detail above, according to the present invention, the position can be maintained at the fully open or fully closed position without applying the current, and the current is made to flow only when switching to the fully open or fully closed position. Thus, it is possible to provide a swing motor capable of measuring power saving.

[Brief description of drawings]

FIG. 1 is a sectional view of a swing motor according to an embodiment of the present invention.

FIG. 2 shows a magnetic circuit in a swing motor when energized.

FIG. 3 is a diagram showing NS characteristics of a swing motor when energized.

FIG. 4 is a diagram showing a bipolar drive circuit for driving the swing motor.

FIG. 5 is a diagram showing drive waveforms of a bipolar drive circuit.

FIG. 6 is a unipolar drive circuit for driving the motor of the present invention.

FIG. 7 is a timing chart for explaining the operation of the unipolar drive circuit.

FIG. 8 is a system configuration diagram showing an intake control device of a four-cylinder engine that employs the swing motor of the present invention.

FIG. 9 is a sectional view of the intake control valve.

FIG. 10 is a sectional view of a conventional motor.

FIG. 11 shows a magnetic circuit of a conventional motor in a non-energized state.

FIG. 12 is a diagram showing NS characteristics when a conventional motor is energized.

FIG. 13 is a diagram showing a conduction waveform and an operation waveform of a conventional motor.

[Explanation of symbols]

20 ... Housing, 21 ... Starter core, 22n ... N
Poles, 23a, 23b ... coils, 24a, 24b ... protrusions,
25 ... rotor.

Front page continued (72) Inventor Tokio Obama 1-1, Showa-cho, Kariya city, Aichi prefecture, Nihon Denso Co., Ltd. (72) Inventor Toshio Yamada, 1-town Toyota town, Toyota city, Aichi prefecture Toyota Automobile Co., Ltd.

Claims (4)

[Claims] 1. A rotor comprising a permanent magnet, first and second winding coils wound around a stator core at positions facing each other with the rotor interposed therebetween, and the first winding coil. And a single fixed magnetic pole provided on the stator core that is substantially equidistant from the second winding coil, and the rotor is in the non-energized state of the first and second winding coils. Is stable between the single fixed magnetic pole and the first winding coil or between the single fixed magnetic pole and the second winding coil. 2. A rotor composed of a permanent magnet, first and second winding coils wound around a stator core at positions facing each other with the rotor interposed therebetween, and the first winding coil. And a single fixed magnetic pole provided on the stator core at a position substantially equidistant from the second winding coil, and a current is selectively applied to the first and second winding coils,
And a drive circuit for switching the rotor between the single fixed magnetic pole and the first winding coil or between the single fixed magnetic pole and the second winding coil. Swing motor. 3. The swing motor according to claim 2, wherein the drive circuit is a bipolar drive circuit. 4. The swing motor according to claim 2, wherein the drive circuit is a unipolar drive circuit.