JP2008160920A - Wire connection pattern switching unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire connection pattern switching unit of simple structure suitable for enhancing power efficiency during high speed operation. <P>SOLUTION: Switches S<SB>U1</SB>-S<SB>U3</SB>, S<SB>V1</SB>-S<SB>V3</SB>and S<SB>W1</SB>-S<SB>W3</SB>for switching wire connection of that phase, and a switch S<SB>C</SB>for switching interphase wire connection of the coils of U phase, V phase, and W phase to Y connection or Δ connection are provided such that a plurality of coils of that phase are connected in series or parallel or any one of the plurality of coils of that phase is connected for each of the U phase, V phase, and W phase. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an apparatus for switching a connection pattern of an armature winding of a motor, and more particularly to a connection pattern switching apparatus suitable for improving power efficiency at high speed operation with a simple structure.

  An embedded permanent magnet type synchronous motor (hereinafter referred to as an IPM (Interior Permanent Magnetic) motor) is a brushless motor in which a permanent magnet is embedded in a rotor core. The IPM motor has a feature that the output torque per volume is large and the input voltage is small. Due to such features, the IPM motor is preferably applied to a drive motor for a hybrid electric vehicle (hereinafter referred to as HEV (Hybrid Electric Vehicle)).

FIG. 17 is a graph showing the relationship between the torque and the rotational speed of the IPM motor when the HEV is traveling at a high speed.
Conventionally, when a HEV equipped with an IPM motor is operated at high speed, a field weakening current must be supplied to the IPM motor in order to suppress the induced electromotive force of the IPM motor. Therefore, when the HEV is operated at high speed, the IPM motor requires a field weakening current even if it rotates without assisting the engine, and the engine bears the electric power. Therefore, as shown in FIG. The loss of fuel has increased, which has been a factor in reducing fuel consumption.

  Therefore, a technique described in Patent Document 1 is known as a technique for eliminating the field weakening control during high-speed operation. This is to insert a boosting converter between the power supply and the inverter. When it is determined from the operation command that the induced electromotive force exceeds the power supply voltage, the boosting converter boosts the power supply voltage and the inverter, IPM It supplies high voltage to the motor. A similar technique is also disclosed in Patent Document 1.

Patent Document 2 discloses a structure in which the equivalent number of series conductors (number of turns) can be changed by changing the connection position of the Δ winding and the star winding of the armature winding of the generator. ing.
Patent Document 3 discloses a mechanism capable of generating a predetermined voltage by switching the connection state of a coil in response to the rotational speed of a rotor and further using magnetic flux control in a permanent magnet generator. Yes.
Japanese Patent Laying-Open No. 2004-80998 (FIG. 1) Japanese Patent Laying-Open No. 2005-45962 (FIGS. 5, 9, and 14) Japanese Patent Laying-Open No. 2005-184948 (FIGS. 5 and 7) Hiroshi Aihara: “Development of a new hybrid motor for SUV”, 2005 Motor Technology Symposium, pp. C1-2-1 to C1-2-10

However, the technique described in Patent Document 1 and the technique described in Non-Patent Document 1 have a problem in that a boosting converter must be provided and the structure becomes complicated.
In addition, the technique described in Patent Document 2 has a problem in that fine control according to the rotational speed of the IPM motor cannot be performed only by changing the connection position of the Δ winding and the star winding. .

Further, in the technique described in Patent Document 3, the coil connection state is switched in response to the rotational speed of the rotor, but because the generator performs switching control so as to obtain a predetermined voltage, It cannot be applied as control during high-speed operation of the IPM motor.
Therefore, the present invention has been made paying attention to such an unsolved problem of the conventional technology, and has a simple structure and suitable wiring pattern switching for improving the power efficiency during high-speed operation. The object is to provide a device.

  [Invention 1] To achieve the above object, the connection pattern switching device of Invention 1 includes a plurality of coils corresponding to the first phase, a plurality of coils corresponding to the second phase, and a third phase among the three phases. A connection pattern switching device applied to a motor including a stator in which armature windings are formed by a plurality of coils corresponding to, and a rotor rotatably provided inside the stator. A switch that switches connection of coils of the phase so that a part or all of the coils of the phase are connected in series or in parallel, or one of the plurality of coils of the phase is connected. And a switch for switching the connection between the phases of the phase, the second phase and the third phase of the coil to the Y connection or the Δ connection.

With such a configuration, the connection of the coils of each phase is switched and the connection of the coils between the phases is switched by switching the switch.
As a connection pattern, a connection pattern in which a part of a plurality of coils in each phase (for example, two out of four) is connected in series, a connection pattern in which a part of a plurality of coils in each phase is connected in parallel, A connection pattern in which all of the plurality of coils in each phase (for example, three out of four) are connected in series, a connection pattern in which all of the plurality of coils in each phase are connected in parallel, and a plurality of coils in each phase There are at least two of the connection patterns to which any one of them is connected, a connection pattern in which each phase is a Y connection, and a connection pattern in which each phase is a Δ connection. A connection pattern of these combinations can be realized by the switch switching pattern.

  Here, the connection of each phase may be configured to switch independently (for example, a configuration in which one phase is connected in series and the other phases can be connected in parallel), and the connection state of each phase is the same. Alternatively, the respective phases may be switched together. Hereinafter, it is the same in the connection pattern switching device of the invention 4.

[Invention 2] Furthermore, the connection pattern switching device according to Invention 2 is the connection pattern switching device according to Invention 1, wherein the rotation speed detection means detects the rotation speed of the motor, and the detection result of the rotation speed detection means Switching control means for controlling switching of the switch is provided.
If it is such a structure, the rotational speed of a motor will be detected by a rotational speed detection means, and switching of a switch will be controlled based on the detection result by a switching control means.

  [Invention 3] Further, the connection pattern switching device of Invention 3 is the connection pattern switching device of Invention 2, in which the switching control means includes m (m = 2, 3,...) Coils in series for each phase. A first switching state for connecting and Y-connection, n (n <m) coils for each phase connected in series and a second switching state for Y-connection, n for each phase A third switching state in which coils are connected in series and the Δ connection is established, a fourth switching state in which m coils are connected in parallel for each phase and the Y connection is established, and m coils are provided for each phase. Are connected in parallel and switched to any one of the fifth switching states in which the Δ connection is established, as the rotational speed of the motor increases.

With such a configuration, first, the switch is switched to the first switching state by the switching control means. As a result, m coils are connected in series for each phase and become Y-connected.
When the rotational speed of the motor increases, the switch is switched to the second switching state by the switching control means. As a result, n coils are connected in series for each phase and become Y-connected, and an increase in field weakening current can be suppressed compared to the first switching state.

When the rotation speed of the motor further increases, the switch is switched to the third switching state by the switching control means. As a result, n coils are connected in series for each phase and become a Δ connection, and an increase in field weakening current can be suppressed compared to the second switching state.
When the rotation speed of the motor further increases, the switch is switched to the fourth switching state by the switching control means. As a result, m coils are connected in parallel for each phase and become Y-connected, and an increase in field weakening current can be suppressed compared to the third switching state.
When the rotation speed of the motor further increases, the switch is switched to the fifth switching state by the switching control means. As a result, m coils are connected in parallel for each phase and become a Δ connection, and an increase in field weakening current can be suppressed compared to the fourth switching state.

  [Invention 4] Furthermore, the connection pattern switching device of Invention 4 includes a plurality of coils corresponding to the first phase, a plurality of coils corresponding to the second phase, and a plurality of coils corresponding to the third phase among the three phases. A connection pattern switching device applied to a motor including a stator having armature windings formed thereon and a rotor rotatably provided inside the stator, and each of the phases includes a plurality of the phase A switch for switching the connection of the coils of the phase so that a part or all of the coils are connected in series or in parallel or any one of the plurality of coils of the phase is connected, and the coils between the phases are Y-connected or Δ connection was made.

If it is such a structure, the connection of the coil of each phase will be switched by switching of a switch.
As a connection pattern, a connection pattern in which a part of a plurality of coils in each phase (for example, two out of four) is connected in series, a connection pattern in which a part of a plurality of coils in each phase is connected in parallel, A connection pattern in which all of the plurality of coils in each phase (for example, three out of four) are connected in series, a connection pattern in which all of the plurality of coils in each phase are connected in parallel, and a plurality of coils in each phase There are at least two of the connection patterns to which any one of them is connected. A connection pattern of these combinations can be realized by the switch switching pattern.

[Invention 5] Further, the connection pattern switching device of Invention 5 is the connection pattern switching device of Invention 4, in which the rotational speed detection means for detecting the rotational speed of the motor and the detection result of the rotational speed detection means are Switching control means for controlling switching of the switch is provided.
If it is such a structure, the rotational speed of a motor will be detected by a rotational speed detection means, and switching of a switch will be controlled based on the detection result by a switching control means.

  [Invention 6] Further, the connection pattern switching device according to Invention 6 is the connection pattern switching device according to Invention 5, wherein the switching control means includes m (m = 2, 3,...) Coils in series for each phase. Either the first switching state to be connected, or the second switching state in which n (n <m) coils are connected in series for each phase, the switches in the order as the rotational speed of the motor increases. Switch.

With such a configuration, first, the switch is switched to the first switching state by the switching control means. As a result, m coils are connected in series for each phase.
When the rotational speed of the motor increases, the switch is switched to the second switching state by the switching control means. As a result, n coils are connected in series for each phase, and an increase in field weakening current can be suppressed compared to the first switching state.

  [Invention 7] Furthermore, the connection pattern switching device according to Invention 7 is the connection pattern switching device according to any one of Inventions 1 to 6, wherein the switch comprises a relay switch or a semiconductor switch.

  As described above, according to the connection pattern switching device of the first or fourth aspect of the present invention, at the time of high-speed operation of the motor, the power consumption can be reduced by switching the switch so that the connection pattern reduces the field weakening current. Therefore, the effect that the power efficiency at the time of high-speed driving | operation can be improved is acquired. Further, there is no need to provide a boosting converter, and an effect that the structure becomes simple can be obtained.

Furthermore, according to the connection pattern switching device of the invention 2 or 5, the switching of the switch is controlled in accordance with the rotational speed of the motor, so that the power consumption during high-speed operation of the motor can be effectively reduced. Is obtained.
Furthermore, according to the connection pattern switching device of the invention 3 or 6, since the increase of the field weakening current is suppressed as the rotation speed of the motor increases, the power consumption during high-speed operation of the motor can be further reduced. The effect is obtained.

  Furthermore, according to the connection pattern switching device of the invention 4, an effect that the structure is simpler than that of the connection pattern switching device of the invention 1 is obtained.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. 1 to 9 are diagrams showing a first embodiment of a connection pattern switching device according to the present invention.
In the present embodiment, the connection pattern switching device according to the present invention is applied to a case where power consumption during high-speed operation of an IPM motor is reduced.
First, the configuration of a motor control system to which the present invention is applied will be described.

FIG. 1 is a block diagram showing the configuration of the motor control system.
As shown in FIG. 1, the motor control system includes a motor 10 that is a three-phase IPM motor, a driver 20 that drives the motor 10, a rotation speed detection sensor 30 that detects the rotation speed of the motor 10, and a rotation speed detection. Based on the speed detection value from the sensor 30, a switching control device 40 that performs switching control of connection of armature windings of the motor 10 is configured.

The motor 10 includes a cylindrical stator and a rotor that is rotatably provided via an air gap inside the stator. The rotor includes a rotor iron core and a plurality of permanent magnets constituting a field magnet.
The driver 20 controls a load current applied to the motor 10 based on a speed command value given from the outside so that the rotation speed of the motor 10 becomes the speed command value. The speed detection value is input, and the load current value to the motor 10 is feedback controlled so that the difference between the input speed detection value and the speed command value is eliminated.

Next, the outline of the connection pattern of the armature winding will be described.
FIG. 2 is a diagram showing an outline of a connection pattern of armature windings.
As shown in FIG. 2, the armature winding includes coils L _U1 and L _U2 corresponding to the U phase among the three phases, coils L _V1 and L _V2 corresponding to the V phase, and a coil L corresponding to the W phase. _W1 and _LW2 . Coils L _U1 , L _V1 and L _W1 are outer windings of the motor 10, and coils L _U2 , L _V2 and L _W2 are inner windings of the motor 10.

In the present embodiment, five connection patterns are realized by switching the connections of the coils L _U1 , L _U2 , L _V1 , L _V2 , L _W1 , and L _W2 .
The first connection pattern, the outer terminals T _U3 inner terminal T _U2 and the coil L _U2 of the coil L _U1, the outer terminals T _V3 inner terminal T _V2 and the coil L _V2 of the coil L _V1, inside the coil L _W1 Connect terminal T _W2 and outer terminal T _W3 of coil L _W2 to neutral point terminal T _U4 of coil L _U2 , neutral point terminal T _V4 of coil L _V2 and neutral point T _W4 of coil L _W2. is intended to outer terminals T _U1 of the coil L _U1, the outer terminals T _W1 of the outer terminals T _V1 and the coil L _W1 of the coil L _V1 and the output terminal of the driver 20. Thereby, the coil of each phase is connected in series and becomes Y connection. Hereinafter, in the present embodiment, the first connection pattern is referred to as “two series Y-type connection pattern”.

In the second connection pattern, the neutral point terminals T _U4 , T _V4 , T _W4 are connected, and the outer terminals T _U3 , T _V3 , T _W3 are used as output terminals to the driver 20. Thereby, one coil of each phase is connected and it becomes Y connection. Hereinafter, in the present embodiment, the second connection pattern is referred to as “one series Y-type connection pattern”.
In the third connection pattern, the outer terminal T _U3 and the neutral point terminal T _W4 are connected to the outer terminal T _V3 and the neutral point terminal T _U4 , and the outer terminal T _W3 and the neutral point terminal T _V4 are connected to the outer side. Terminals T _U3 , T _V3 , T _W3 are used as output terminals to the driver 20. Thereby, one coil of each phase is connected and it becomes a Δ connection. Hereinafter, in the present embodiment, the third connection pattern is referred to as “one series Δ-type connection pattern”.

The fourth connection pattern includes the outer terminals T _U1 and T _U3 , the outer terminals T _V1 and T _V3 , the outer terminals T _W1 and T _W3 , the inner terminals T _U2 , T _V2 , T _W2 and the neutral point terminal T. _{U 4} , T _V4 , and T _W4 are connected to each other, and the outer terminals T _U1 , T _V1 , and T _W1 are used as output terminals to the driver 20. Thereby, the coils of each phase are connected in parallel and become Y-connection. Hereinafter, in the present embodiment, the fourth connection pattern is referred to as “2-parallel Y-type connection pattern”.

The fifth connection pattern includes the outer terminals T _U1 and T _U3 , the inner terminal T _W2 and the neutral point terminal T _W4 , and the outer terminals T _V1 and T _U3 , the inner terminal T _U2 and the neutral point terminal T _U4 on the outer side. The terminals T _W1 , T _U3 , the inner terminal T _V2 and the neutral point terminal T _V4 are connected to each other, and the outer terminals T _U1 , T _V1 , T _W1 are used as output terminals to the driver 20. Thereby, the coils of the respective phases are connected in parallel and become a Δ connection. Hereinafter, in the present embodiment, the fifth connection pattern is referred to as “2-parallel Δ-type connection pattern”.

Next, the circuit configuration of the armature winding will be described.
FIG. 3 is a diagram illustrating a circuit configuration of the armature winding.
As shown in FIG. 3, switches S _U1 , S _V1 , and S _W1 are provided on the outer terminals (outer terminals T _U1 , T _V1 , and T _{W1 in} FIG. 2) of the coils L _U1 , L _V1 , and L _W1 . ing.
Switches S _U2 , S _V2 , and S _W2 are provided between the coils L _U1 and L _U2 , between the coils L _V1 and L _V2 , and between the coils L _W1 and L _W2 , respectively.

Switches S _U3 , S _V3 , and S _W3 are provided at U-phase, V-phase, and W-phase output terminals, respectively.
Inside the terminal of the coil _{L U2, L V2, L W2} ( neutral terminal T _U4 in FIG. _{2, T V4, T W4)} , the switch S _C is provided.
The switch S _U1 switches between a connected state and a non-connected state at any of a plurality of points among the terminals of the wiring l _U3 to the switches S _U2 and S _C and the outer terminal of the coil L _U1 . A wiring l _U1 to the switch S _U3 is connected to the outer terminal of the coil L _U1 . The switches S _V1 and S _W1 are similarly configured.

Switch S _U2, the terminal wiring l _U3, any more of the terminals of the coil L inside terminals _U1, (outside terminal T _U3 in FIG. 2) an outer terminal of the coil L _U2, and wiring l _U4 to switches S _C The point is switched to either a connected state or a disconnected state. A wiring l _U2 to the switch S _U3 is connected to the outer terminal of the coil L _U2 . The switches S _V2 and S _W2 are similarly configured.

The switch S _U3 switches so that one or both of the terminals of the wirings l _U1 and l _U2 are connected to the output terminal to the driver 20. The switches S _V3 and S _W3 are similarly configured.
Switch S _C is the connection state for any of the plurality of points of the inside terminal of the wiring _{l U3, l U4, l V3} , l V4, l W3, terminals l _W4, and a coil L _U2, L _V2, L _W2 and Switch to one of the unconnected states.

The switches S _{U1 to} S _U3 , S _{V1 to} S _V3 , S _{W1 to} S _W3 , and S _C can be configured with relay switches or semiconductor switches.
Next, the configuration of the switching control device 40 will be described.
FIG. 4 shows a 2-series Y-type connection pattern and its equivalent circuit.
FIG. 5 is a graph showing a change in torque with respect to the rotational speed of the motor 10.

When the speed detection value input from the rotational speed detection sensor 30 is less than the predetermined value V _T1 , the switching control device 40, as shown in FIG. 4, switches S _{U1 to} S _U3 , S _{V1 to} S _V3 , and S _W1. ˜S _W3 and S _C are switched to form a 2-series Y-type connection pattern. As a result, the change in torque with respect to the rotational speed of the motor 10 is as shown by a curve 36 in FIG.
FIG. 6 shows a 1-series Y-type connection pattern and its equivalent circuit.

When the speed detection value input from the rotational speed detection sensor 30 is not less than the predetermined value V _{T1 and} less than the predetermined value V _T2 (V _T2 > V _T1 ), the switching control device 40, as shown in FIG. It switched _{U1 ~S U3, S V1 ~S V3} , S W1 ~S W3, S C, constitute a series Y-connection pattern. As a result, the change in torque with respect to the rotational speed of the motor 10 is as shown by a curve 37 in FIG.
FIG. 7 shows a one-series Δ-type connection pattern and its equivalent circuit.

When the speed detection value input from the rotational speed detection sensor 30 is not less than the predetermined value V _{T2 and} less than the predetermined value V _T3 (V _T3 > V _T2 ), the switching control device 40, as shown in FIG. It switched _{U1 ~S U3, S V1 ~S V3} , S W1 ~S W3, S C, constitute a series Δ-connected patterns. As a result, the change in torque with respect to the rotational speed of the motor 10 is as shown by a curve 38 in FIG.
FIG. 8 shows a 2-parallel Y-type connection pattern and an equivalent circuit thereof.

When the speed detection value input from the rotational speed detection sensor 30 is not less than the predetermined value V _{T3 and} less than the predetermined value V _T4 (V _T4 > V _T3 ), the switching control device 40, as shown in FIG. It switched _{U1 ~S U3, S V1 ~S V3} , S W1 ~S W3, S C, constituting the two parallel Y-connection pattern. As a result, the change in torque with respect to the rotational speed of the motor 10 is as shown by a curve 39 in FIG.
FIG. 9 shows a 2-parallel Δ-type connection pattern and an equivalent circuit thereof.

When the speed detection value input from the rotational speed detection sensor 30 is equal to or greater than a predetermined value V _T4 , the switching control device 40 switches S _{U1 to} S _U3 , S _{V1 to} S _V3 , S _W1 as shown in FIG. ˜S _W3 and S _C are switched to form a 2-parallel Δ-type connection pattern. As a result, the change in torque with respect to the rotational speed of the motor 10 is as shown by a curve 40 in FIG.
Next, the operation of the present embodiment will be described.

When the rotational speed of the motor 10 is less than the predetermined value V _T1 , the switching control device 40 forms a 2-series Y-type connection pattern.
Further, when the rotation speed of the motor 10 increases and the rotation speed of the motor 10 becomes equal to or higher than the predetermined value V _T1 and lower than the predetermined value V _T2 , the switching control device 40 switches to the one-series Y-type connection pattern. As a result, as shown in FIG. 5, since the slope of the rotation speed-torque change curve becomes gentler than that of the 2-series Y-type connection pattern, an increase in the field weakening current can be suppressed as compared with the 2-series Y-type connection pattern. .

When the rotational speed of the motor 10 further increases and the rotational speed of the motor 10 is equal to or higher than the predetermined value V _T2 and lower than the predetermined value V _T3 , the switching control device 40 switches to the 1-series Δ type connection pattern. As a result, as shown in FIG. 5, the slope of the rotation speed-torque change curve becomes gentler than that of the one-series Y-type connection pattern, so that an increase in the field weakening current can be suppressed as compared with the one-series Y-type connection pattern. .

When the rotational speed of the motor 10 further increases and the rotational speed of the motor 10 is equal to or higher than the predetermined value V _T3 and lower than the predetermined value V _T4 , the switching control device 40 switches to the 2-parallel Y-type connection pattern. As a result, as shown in FIG. 5, the slope of the rotation speed-torque change curve becomes gentler than that of the one-series Δ-type connection pattern, so that an increase in the field weakening current can be suppressed as compared with the one-series Δ-type connection pattern. .

When the rotation speed of the motor 10 further increases and the rotation speed of the motor 10 becomes equal to or higher than a predetermined value V _T4 , the switching control device 40 switches to the 2-parallel Δ-type connection pattern. As a result, as shown in FIG. 5, the slope of the rotation speed-torque change curve becomes gentler than that of the 2-parallel Y-type connection pattern, so that an increase in field weakening current can be suppressed as compared with the 2-parallel Y-type connection pattern. .
Thus, in this embodiment, for each phase of the U phase, the V phase, and the W phase, a plurality of coils in that phase are connected in series or in parallel, or any one of the plurality of coils in that phase is The switches S _{U1 to} S _U3 , S _{V1 to} S _V3 , S _{W1 to} S _W3 and switches between the phases of the U phase, V phase and W phase coils to switch the connection of the coil of the phase so that they are connected. and a switch S _C for switching the connection or Δ connection.

As a result, when the motor 10 is operated at high speed, power consumption is achieved by switching the switches S _{U1 to} S _U3 , S _{V1 to} S _V3 , S _{W1 to} S _W3 , and S _C so that a connection pattern that reduces the field weakening current is obtained. Therefore, the power efficiency during high-speed operation can be improved. Further, it is not necessary to provide a boosting converter, and the structure is simple. Therefore, the application to the drive motor of HEV is suitable.

Further, in the present embodiment, the rotation speed detection sensor 30 that detects the rotation speed of the motor 10 and the switches S _{U1 to} S _U3 , S _{V1 to} S _V3 , S _W1 to S _W1 based on the detection result of the rotation speed detection sensor 30. A switching control device 40 for controlling switching of S _W3 and S _C is provided.
Thus, since the switching of the switches _{S U1 ~S U3, S V1 ~S} V3, S W1 ~S W3, S C in accordance with the rotational speed of the motor 10 is controlled, the power consumption during high-speed operation of the motor 10 It can be effectively reduced.

Furthermore, in the present embodiment, the switching control device 40 includes a first connection state in which a coil of each phase is connected in series and forms a two-series Y-type connection pattern in which Y connection is established, and one coil of each phase is connected. Second connection state that constitutes a one-series Y-type connection pattern that is connected to each other and forms a Y-connection, a third connection state that constitutes a one-series Δ-type connection pattern in which one coil of each phase is connected and becomes a Δ connection, and each phase A fourth parallel connection state in which two coils are connected in parallel and a Y-connection pattern is formed, and a two-parallel Δ connection pattern in which coils of each phase are connected in parallel and is a Δ connection In any of the fifth connection states, the switches S _{U1 to} S _U3 , S _{V1 to} S _V3 , S _{W1 to} S _W3 , and S _C are switched in that order as the rotational speed of the motor 10 increases.

  As a result, an increase in the field weakening current is suppressed as the rotational speed of the motor 10 increases, so that the power consumption during high-speed operation of the motor 10 can be further reduced. Here, “suppression” means that the field weakening current required when the connection state is switched according to the rotational speed is greater than the field weakening current required when the connection state is maintained without switching at the same rotational speed. Also means getting smaller.

In the first embodiment, the U phase corresponds to the first phase of Invention 1, the V phase corresponds to the second phase of Invention 1, and the W phase corresponds to the third phase of Invention 1. The rotation speed detection sensor 30 corresponds to the rotation speed detection means of the invention 2, and the switching control device 40 corresponds to the switching control means of the invention 2 or 3.
Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 10 thru | or 13 is a figure which shows 2nd Embodiment of the connection pattern switching apparatus based on this invention.

This embodiment, the relative first embodiment, without providing the switch S _C, is that in advance Y-connection coils between the phases different. Hereinafter, only the parts different from the first embodiment will be described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted.
First, an outline of the connection pattern of the armature winding will be described.

FIG. 10 is a diagram illustrating an outline of a connection pattern of armature windings.
As shown in FIG. 10, the armature winding is formed by coils L _U1 and L _U2 , coils L _V1 and L _V2 , and coils L _W1 and L _W2, and the coils between the phases are Y-connected. .
In the present embodiment, two connection patterns are realized by switching the connections of the coils L _U1 , L _U2 , L _V1 , L _V2 , L _W1 , and L _W2 .

In the first connection pattern, the inner terminal T _U2 and the outer terminal T _U3 are connected, the inner terminal T _V2 and the outer terminal T _V3 are connected to the inner terminal T _W2 and the outer terminal T _W3 , respectively, and the outer terminals T _U1 and T _V1 are connected. , T _W1 is used as an output terminal to the driver 20. Thereby, the coil of each phase is connected in series and becomes Y connection. Hereinafter, in the present embodiment, the first connection pattern is referred to as “two series Y-type connection pattern”.

In the second connection pattern, the outer terminals T _U3 , T _V3 , T _W3 are used as output terminals to the driver 20. Thereby, one coil of each phase is connected and it becomes Y connection. Hereinafter, in the present embodiment, the second connection pattern is referred to as “one series Y-type connection pattern”.
Next, the circuit configuration of the armature winding will be described.
FIG. 11 is a diagram illustrating a circuit configuration of the armature winding.

As shown in FIG. 11, switches S _U2 , S _V2 , and S _W2 are provided between the coils L _U1 and L _U2 , between the coils L _V1 and L _V2 , and between the coils L _W1 and L _W2 , respectively. ing.
Switches S _U3 , S _V3 , and S _W3 are provided at U-phase, V-phase, and W-phase output terminals, respectively.
The switch S _U2 is an arbitrary plurality of points among the inner terminal of the coil L _U1 (inner terminal T _{U2 in} FIG. 10), the outer terminal of the coil L _U2 (outer terminal T _{U3 in} FIG. 10), and the terminal of the wiring l _U2. Switch to either connected or unconnected state. The switches S _V2 and S _W2 are similarly configured.

The switch S _U3 switches so that one or both of the terminals of the wirings l _U1 and l _U2 are connected to the output terminal to the driver 20. The switches S _V3 and S _W3 are similarly configured.
Next, the configuration of the switching control device 40 will be described.
FIG. 12 shows a 2-series Y-type connection pattern and its equivalent circuit.
When the speed detection value input from the rotational speed detection sensor 30 is less than the predetermined value V _T11 , the switching control device 40 switches S _U2 , S _U3 , S _V2 , S _V3 , S _W2 as shown in FIG. , _SW3 are switched to form a 2-series Y-type connection pattern. As a result, the change in torque with respect to the rotational speed of the motor 10 is as shown by a curve 36 in FIG.

FIG. 13 shows one serial Y-type connection pattern and its equivalent circuit.
When the speed detection value input from the rotational speed detection sensor 30 is equal to or greater than the predetermined value V _T11 , the switching control device 40 switches S _U2 , S _U3 , S _V2 , S _V3 , S _W2 as shown in FIG. , _SW3 are switched to form a one-series Y-type connection pattern. As a result, the change in torque with respect to the rotational speed of the motor 10 is as shown by a curve 37 in FIG.

Next, the operation of the present embodiment will be described.
When the rotational speed of the motor 10 is less than the predetermined value V _T11 , the two-series Y-type connection pattern is configured by the switching control device 40.
When the rotation speed of the motor 10 further increases and the rotation speed of the motor 10 becomes equal to or higher than the predetermined value V _T11 , the switching control device 40 switches to the 1-series Y-type connection pattern. As a result, as shown in FIG. 5, since the slope of the rotation speed-torque change curve becomes gentler than that of the 2-series Y-type connection pattern, an increase in the field weakening current can be suppressed as compared with the 2-series Y-type connection pattern. .

Thus, in this embodiment, for each phase of the U phase, the V phase, and the W phase, a plurality of coils in that phase are connected in series or any one of the plurality of coils in that phase is connected. The switches S _U2 , S _U3 , S _V2 , S _V3 , S _W2 , and S _W3 are provided to switch the connection of the coils of the phases so that the coils between the phases are Y-connected.
As a result, the same effects as those of the first embodiment can be obtained, and the structure and switching control can be simplified as compared with the first embodiment.

In the second embodiment, the U phase corresponds to the first phase of Invention 4, the V phase corresponds to the second phase of Invention 4, and the W phase corresponds to the third phase of Invention 4. The rotation speed detection sensor 30 corresponds to the rotation speed detection means of the invention 5, and the switching control device 40 corresponds to the switching control means of the invention 5 or 6.
In the first embodiment, two coils are provided for each phase. However, the present invention is not limited to this, and three or more coils may be provided for each phase.

FIG. 14 is a diagram showing an outline of a connection pattern of armature windings when three coils are provided for each phase.
FIG. 15 is a graph showing the relationship between the motor torque and the number of revolutions when three coils are provided for each phase.
For example, as shown in FIG. 14, the number of divisions of each phase winding can be increased from two divisions to three divisions, and three coils can be provided for each phase. As a result, an envelope curve close to the rotation speed-torque change curve as shown in FIG. 15 is obtained, so that it is possible to meticulously cope with changes in operating conditions.

  Thus, when there are three or more coils for each phase, a connection pattern in which a part of the coils for each phase is connected in series or in parallel may be configured. In addition, the coils selected from the plurality of coils of each phase are classified into two or more groups, and for each group, the coils belonging to the group are connected in series or in parallel, and further, in series or between each group You may comprise the connection pattern connected in parallel.

In the second embodiment, two coils are provided for each phase. However, the present invention is not limited to this, and three or more coils may be provided for each phase.
FIG. 16 is a diagram illustrating an outline of a connection pattern of armature windings in the case where three coils are provided for each phase.
For example, as shown in FIG. 16, the number of divisions of each phase winding can be increased from two divisions to three divisions, and three coils can be provided for each phase. As a result, the number of possible connection patterns is smaller than in the case of FIG. 14, but the area that can be covered can be expanded by using the field weakening control together.

  Thus, when there are three or more coils for each phase, a connection pattern in which a part of the coils for each phase is connected in series or in parallel may be configured. In addition, the coils selected from the plurality of coils of each phase are classified into two or more groups, and for each group, the coils belonging to the group are connected in series or in parallel, and further, in series or between each group You may comprise the connection pattern connected in parallel.

In the second embodiment, for each phase, the connection of the coil of the phase is switched so that the two coils of the phase are connected in series. It is good also as a structure which switches the connection of the coil of the phase so that two coils may be connected in parallel. The same applies when there are three or more coils for each phase.
Moreover, in the said 2nd Embodiment, although the coil between each phase was comprised by Y connection, it is not restricted to this, The coil between each phase can also be comprised by (DELTA) connection. The same applies when there are three or more coils for each phase.

In the first and second embodiments, since there is a possibility that a discharge occurs at the time of switching the switch, it is preferable to take measures against it. Specifically, it is necessary to equip the inside of the motor 10 with an element that absorbs discharge or to prepare a circuit for circulating the winding current outside the motor 10 or inside the inverter connected to the motor 10.
In the first and second embodiments, the connection pattern switching device according to the present invention is applied to the case of reducing the power consumption during the high-speed operation of the IPM motor. However, the present invention is not limited to this. The present invention can be applied to other cases without departing from the gist of the present invention. For example, it can be applied to other types of motors.

It is a block diagram which shows the structure of a motor control system. It is a figure which shows the outline | summary of the connection pattern of an armature winding. It is a figure which shows the circuit structure of an armature winding. 2 shows a 2-series Y-type connection pattern and its equivalent circuit. 3 is a graph showing a change in torque with respect to the rotation speed of a motor 10. 1 shows a 1-series Y-type connection pattern and its equivalent circuit. 1 shows a series Δ type connection pattern and an equivalent circuit thereof. 2 shows a 2-parallel Y-type connection pattern and its equivalent circuit. 2 shows a two-parallel Δ-type connection pattern and its equivalent circuit. It is a figure which shows the outline | summary of the connection pattern of an armature winding. It is a figure which shows the circuit structure of an armature winding. 2 shows a 2-series Y-type connection pattern and its equivalent circuit. 1 shows a 1-series Y-type connection pattern and its equivalent circuit. It is a figure which shows the outline | summary of the connection pattern of an armature winding at the time of comprising and providing three coils for every phase. It is a graph which shows the relationship between the torque of a motor at the time of comprising and providing three coils for every phase, and rotation speed. It is a figure which shows the outline | summary of the connection pattern of an armature winding at the time of comprising and providing three coils for every phase. It is a graph which shows the relationship between the torque and rotation speed of an IPM motor when HEV carries out steady driving | running | working at high speed.

Explanation of symbols

10 Motor 20 Driver 30 Rotational speed detection sensor 40 Switching control device L _U1 , L _U2 , L _V1 coil L _V2 , L _W1 , L _W2 coil T _U2 , T _V2 , T _W2 inner terminal T _U1 , T _U3 , T _V1 outside terminal T _V3, T _W1, T _W3 outside terminal T _U4, T _V4, T _W4 neutral terminal S _U1 to S _U3 switches S _V1 to S _V3 switches S _W1 ~S _W3, S _C switch l _U1 to l _U4 wiring l _{V1 to} l _V4 wiring l _{W1 to} l _W4 wiring

Claims (7)

Of the three phases, a plurality of coils corresponding to the first phase, a plurality of coils corresponding to the second phase, a stator in which an armature winding is formed by a plurality of coils corresponding to the third phase, and the inside of the stator A connection pattern switching device applied to a motor provided with a rotor rotatably provided in
A switch for switching the connection of the coils of the phase so that a part or all of the coils of the phase are connected in series or in parallel or one of the coils of the phase is connected for each phase. And a switch for switching the connection between the phases of the first phase, the second phase, and the third phase coil to a Y connection or a Δ connection. In claim 1,
A wiring pattern switching device comprising: a rotational speed detecting means for detecting a rotational speed of the motor; and a switching control means for controlling switching of the switch based on a detection result of the rotational speed detecting means. In claim 2,
The switching control means includes a first switching state in which m (m = 2, 3,...) Coils are connected in series for each phase and the Y connection is established, and n (n <m) for each phase. A second switching state in which a number of coils are connected in series and the Y connection is made; a third switching state in which n coils are connected in series for each phase and a Δ connection is made; The rotational speed of the motor is either in a fourth switching state in which coils are connected in parallel and in the Y connection, or in a fifth switching state in which m coils are connected in parallel for each phase and in the Δ connection. The connection pattern switching device is characterized in that the switches are switched in that order as the height of the wire increases. Of the three phases, a plurality of coils corresponding to the first phase, a plurality of coils corresponding to the second phase, a stator in which an armature winding is formed by a plurality of coils corresponding to the third phase, and the inside of the stator A connection pattern switching device applied to a motor provided with a rotor rotatably provided in
A switch for switching the connection of the coils of the phase so that a part or all of the coils of the phase are connected in series or in parallel or one of the coils of the phase is connected for each phase. And a connection pattern switching device, wherein the coils between the phases are Y-connected or Δ-connected. In claim 4,
A wiring pattern switching device comprising: a rotational speed detecting means for detecting a rotational speed of the motor; and a switching control means for controlling switching of the switch based on a detection result of the rotational speed detecting means. In claim 5,
The switching control means includes a first switching state in which m (m = 2, 3,...) Coils are connected in series for each phase, and n (n <m) coils are connected in series for each phase. The connection pattern switching device according to any one of the second switching states to be connected, wherein the switches are switched in that order as the rotational speed of the motor increases. In any one of Claims 1 thru | or 6,
The connection pattern switching device, wherein the switch is a relay switch or a semiconductor switch.

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