JPH06292349A - Two-position driven-type high-speed motor - Google Patents

Abstract

PURPOSE:To provide a two-position driven-type high-speed motor wherein power can be saved by a method wherein the position can be kept without causing current to flow when the motor is at the bully opened or closed position and current is caused to flow only when the position is switched, from the fully opened position to closed position or vice versa. CONSTITUTION:A two-position driven-type high speed motor is constituted of a rotor 24 which is magnetized in four poles, a first winding 23a which is wound round one of the projections 22a out of the four projections 22a-22d which are formed on a stator core nearly 90 deg. apart from the adjacent ones, and a second winding 23b which is wound round the projection 22b which is formed about 90 deg. apart from the projection around which the first winding 23a is wound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-position drive high speed motor capable of measuring 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 an S pole is generated at the tip of a and an N pole is generated at the tip of the protrusion 14b, the rotor 15 passes through the transient state of FIG. 12B.
Moves 90 degrees clockwise to the position shown in FIG. By the way, the rotor 15 shown in FIG.
The position of -45 ° is the rotor 1 shown in FIG.
Position 5 is + 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 two-position drive type high-speed motor capable of saving power.

[0011]

A two-position drive type high-speed motor according to a first aspect of the present invention includes a rotor polarized to four poles and a stator.
The first winding wound around one of the four protrusions provided at a position approximately 90 degrees away from the tacoa, and provided approximately 90 degrees away from the protrusion around which the first winding is wound. And a second winding wound around the projected protrusion.

A two-position drive type high-speed motor according to a second aspect of the present invention is one of a rotor polarized to four poles and four protrusions provided at positions substantially 90 degrees apart from the stator core. The first winding wound on the protrusion, the second winding wound on the protrusion about 90 degrees away from the protrusion wound on the first winding, and the first and second winding coils. It is composed of a drive circuit for selectively passing a current and switching the rotor to two stable positions of ± 45 degrees.

The drive circuit of the two-position drive type high-speed motor according to claim 3 is a bipolar circuit.

The drive circuit of the two-position drive type high speed motor according to the fourth aspect is a unipolar drive circuit.

[0015]

According to the present invention, the rotor is located at one of two stable positions when the first and second winding coils are in the non-energized state, and the drive circuit is When driven to energize the first and second winding coils,
The stable position of the rotor switches to the other stable position.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A two-position drive type high speed motor according to a first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a two-position drive type high-speed motor, and FIG.
Magnetic circuit in position drive type high speed motor, Fig. 3 shows 2 when energized
FIG. 4 is a diagram showing NS characteristics of a position drive type high speed motor, FIG. 4 is a diagram showing a bipolar drive circuit for driving a two position drive type high speed motor, and FIG. 5 is a diagram showing drive waveforms.

In FIG. 1A, 20 is a motor housing and 21 is a stator core. The stator core 21 is provided with protrusions 22a to 22d inwardly at positions separated by approximately 90 degrees. That is, the protrusion 22a
The protrusion 22c and the protrusion 22b and the protrusion 22d are located at positions facing each other. The protrusion amounts of the protrusions 22a and 22c are substantially the same, the protrusion amounts of the protrusions 22b and 22d are substantially the same, and the protrusion amounts of the protrusions 22b and 22d are the protrusions 2
It is set smaller than the protruding amount of 2a and 22c. Here, the ends of the protrusions 22a and 22b on the separated side are shown in FIG.
It is notched as shown in (B).

The first coil 23 is formed on the protrusion 22a.
a is wound, and a second coil 23b having a winding direction opposite to that of the first coil is wound on the protrusion 22b provided at a position adjacent to the protrusion 22a in the clockwise direction by 90 degrees. ing.

The coils 23a and 23b are connected in series, and both ends of the coils 23a and 23b are connected to a drive circuit (not shown).

Further, there are provided four-polarized rotors 24 which are rotatably supported by a support shaft (not shown) with predetermined air gaps from the ends of the projections 22a to 22d.

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 24, there are two stable positions (positions rotated by 90 degrees) of the rotor 24 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 24 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 overshoot of the data 24.

Therefore, as shown in FIG.
The tips of a and 22b are magnetized to the S pole and the N pole, respectively.
Therefore, the repulsive force of the S pole of the rotor 24 and the S pole generated at the tip of the protrusion 22a and the repulsive force of the N pole of the rotor 24 and the N pole generated at the tip of the protrusion 22b cause the rotor 24 to rotate. Is Figure 3
The rotation starts as shown in FIG. 2B, and the stable position shown in FIG. 2B is reached.

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 22a and 22b are magnetized to the N pole and the S pole, respectively. Therefore, the rotor 24 returns from the position shown in FIG. 2 (B) to the position shown in FIG. 3 (A).

That is, in the non-energized state, the rotor 24
Is stable at the position shown in FIG. 2 (A) and the position shown in FIG. 2 (B), and the position of the rotor 24 is set to the position shown in FIG.
Since power is supplied only when switching to the position of (B), 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 is usually reduced if the resistance of the coil is reduced if the number of windings of the coil is the same.
Reducing the resistance of the coil increases the volume of the coil. 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 24 is set 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 overshoot of the data 24.

That is, in the non-energized state, the rotor 24
Is stable at the position shown in FIG. 2 (A) and the position shown in FIG. 2 (B), and the position of the rotor 24 is set to the position shown in FIG.
Since power is supplied only when switching to the position of (B), power consumption can be reduced. Since the unipolar drive method uses separate coils, the power consumption is doubled compared to the bipolar drive method. Since the power consumption of the product of the present invention can be greatly reduced, such a unipolar drive system can be adopted, 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.

In the above embodiment, the four protrusions 22a to the stator core 11 are separated from each other by approximately 90 degrees.
22d is provided, the rotor 24 is provided with magnetic poles having the same number of poles as the projections 22a to 22d, and stable positions 90 degrees apart are switched when the coil is energized. At least six protrusions are provided at intervals, and the rotor 24 has the same number of magnetic poles as the protrusions.
By energizing a coil wound around two adjacent protrusions, it is possible to switch between two stable positions having an angle smaller than 90 degrees when energized.

[0042]

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. , Can save power 2
A position drive type high speed motor can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view of a two-position drive type high speed motor according to an embodiment of the present invention.

FIG. 2 is a magnetic circuit in a two-position drive type high-speed motor when energized.

FIG. 3 is a diagram showing NS characteristics of a two-position drive type high-speed motor when energized.

FIG. 4 is a bipolar drive for driving the two-position drive type high speed motor.
The figure which shows a drive circuit.

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 diagram showing a 4-position drive type high-speed motor of the present invention;
The system block diagram which shows the intake control apparatus of a cylinder engine.

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, 22a-22
d ... Protrusion, 23a, 23b ... Coil, 24 ... Rotor.

Claims (4)

[Claims] 1. A rotor polarized to four poles, and a first winding wound around one of four protrusions provided at positions separated by about 90 degrees from a stator core, and A two-position drive high-speed motor, comprising: a second winding wound on a protrusion provided approximately 90 degrees away from the protrusion on which the first winding is wound. 2. A rotor polarized to four poles, and a first winding wound around one of the four protrusions provided at positions substantially 90 degrees apart from each other in the stator core, A current is selectively applied to the second winding wound on the protrusion that is approximately 90 degrees away from the protrusion on which the first winding is wound, and the first and second winding coils.
A two-position drive high-speed motor comprising a drive circuit for switching the rotor to two stable positions of ± 45 degrees. 3. The two-position drive type high speed motor according to claim 2, wherein the drive circuit is a bipolar drive circuit. 4. The two-position drive type high speed motor according to claim 2, wherein the drive circuit is a unipolar drive circuit.