JP2013013249A - Controller of switched reluctance motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To optimally adjust control timing of current flowing through windings.SOLUTION: A controller of a switched reluctance motor has windings of a plurality of phases which are mutually connected at a neutral point and is operated by supplying current flowing to the neutral point from each phase or current flowing to each phase from the neutral point in accordance with the rotational position of a rotor. The controller includes: setting means (an electrification phase map 23) for setting phases sequentially to be controlled in accordance with rotation of the rotor to be either an electrification phase as a phase for electrification or a non-electrification phase as a phase for non-electrification; electrification means (a drive signal generating unit 30) for electrifying the phase to be controlled in accordance with rotation of the rotor if the phase is set to be the electrification phase; and adjustment means (a commutation signal generating unit 29) for adjusting the control timing of current flowing in the windings of the phase electrified by the electrification means on the basis of the combination of the electrification phase/non-electrification phase before and after the corresponding phase.

Description

  The present invention relates to a control device for a switched reluctance motor.

  A rotor having a plurality of salient poles, a stator having a plurality of inward salient poles arranged so as to surround the rotor, and windings wound around the inward salient poles. There is known a switched reluctance motor that generates a rotational torque by magnetically attracting a salient pole of a rotor to an inward salient pole by selectively energizing the rotor.

  The switched reluctance motor has a configuration in which windings are connected to each other at a neutral point (for example, see Patent Document 1) and a configuration in which a winding is connected independently (for example, Patent Document 2). Reference) exists. In the case of a switched reluctance motor having the former configuration, the current immediately before the currently energized phase is passed by alternately passing the current from the winding to the neutral point and the current from the neutral point to the winding. While preventing a current from continuing to flow through the phase, the influence of the residual magnetic field can be reduced, and a larger torque can be obtained.

JP 2007-028866 A JP 2007-236135 A

  By the way, in the switched reluctance motor having a configuration in which the windings are connected to each other at a neutral point, since the windings are connected to each other, current cannot flow through two or more phases simultaneously. For this reason, since it is necessary to perform switching so that the phases do not overlap each other, for example, in a switched reluctance motor having three phases of U, V, and W, as shown in FIG. It is necessary to switch every time. In FIG. 9A, the horizontal axis represents the rotation angle of the rotor, and the vertical axis represents the energized state of each phase (high is energized and low is de-energized).

  For this reason, in a switched reluctance motor having a configuration in which the windings are connected to each other at a neutral point, the control timing (for example, the conduction angle) of the current flowing through the windings is adjusted to exceed 120 degrees. There is a problem that can not be.

  Accordingly, an object of the present invention is to provide a control device for a switched reluctance motor capable of adjusting a control timing of a current flowing through a winding.

In order to solve the above problems, the present invention has a plurality of phase windings connected to each other at a neutral point, and a current from each phase toward a neutral point or a current from a neutral point toward each phase. In a control device for a switched reluctance motor that operates by supplying the motor according to the rotational position of the rotor, the phase that is sequentially controlled according to the rotation of the rotor is set as an energized phase that is energized or a phase that is not energized Setting means for setting any one of the non-energized phases, and when the phase to be controlled is set to the energized phase according to the rotation of the rotor, the energizing means for energizing the phase; and Adjusting means for adjusting the timing of controlling the current flowing in the winding of the phase by a combination of energized / non-energized phases before and after the phase energized by the energizing means.
According to such an invention, it becomes possible to adjust the control timing of the current flowing through the winding.

In addition to the above-described invention, in another invention, in the case where the previous phase of the phase to be controlled is a non-energized phase, the non-energized phase is also included in the adjustable range and the start timing of energization is adjusted. It is characterized by that.
According to such a configuration, the energization start timing can be adjusted in a wider range including the non-energized phase, and the efficiency can be improved by optimization.

In addition to the above invention, in another invention, in the case where the rear phase of the phase to be controlled is a non-energized phase, the non-energized phase is also included in the adjustable range and the timing of energization end is adjusted. It is characterized by that.
According to such a configuration, the energization end timing can be adjusted in a wider range including the non-energized phase, and the efficiency can be improved by optimization.

Further, in addition to the above-mentioned invention, in another invention, when the rear phase of the phase to be controlled is a non-energized phase, the current generated in the winding including the non-energized phase in the adjustable range is also included. It is characterized by adjusting the recirculation timing.
According to such a configuration, it is possible to adjust the timing of flowing the reflux current in a wider range including the non-energized phase, and the efficiency can be improved by optimization.

In addition to the above-mentioned invention, in another invention, the adjusting means indicates a combination pattern of energized / non-energized phases of phases before and after the phase to be controlled, and a control timing in each pattern. It has a table in which maps are associated with each other, selects a corresponding map based on the pattern, and adjusts control timing based on the selected map.
According to such a configuration, appropriate control can be realized with a simple configuration by selecting a map according to the energization pattern.

According to another aspect of the invention, in addition to the above-described invention, the switched reluctance motor is mounted on a vehicle to drive the vehicle, and the setting means has a predetermined acceleration according to the operation amount of the accelerator. Thus, the energized phase and the non-energized phase are set as described above.
According to such a configuration, power consumption is achieved by realizing optimal acceleration according to the accelerator operation and adjusting the current control timing according to energization / non-energization of the phases before and after the phase to be controlled. Can be reliably suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the control apparatus of the switched reluctance motor which can adjust the control timing of the electric current sent through a coil | winding.

It is a block diagram which shows the structural example of the control apparatus of the switched reluctance motor which concerns on embodiment of this invention. FIG. 2A is an example of an energization rate map, and FIG. 2B is an example of an energization command map. It is a figure which shows an example of an energized phase map. It is a figure which shows an example of the map stored in the map memory | storage part. It is a figure which shows the relationship between the combination pattern of energization / non-energization of a phase, and a selection map. It is a figure which shows the structural example of an arm driver. It is a figure which shows the relationship between the position of the rotor of a switched reluctance motor, and magnetic flux. It is a figure which shows the relationship of the change of the U-phase inductance, the switch state change, and the U-phase current. It is a figure which shows the electric current pattern which flows into each phase. It is a figure which shows the relationship between the electric current value of a phase current, and the amount of magnetic flux. It is a figure which shows the relationship between the positive torque area | region and negative torque area | region by the electric current value of a transmission current. It is a figure which shows the electric current pattern which flows into each phase. It is a figure for demonstrating the flow of control in this embodiment. It is a block diagram which shows the deformation | transformation embodiment of this invention. It is a figure which shows an example of the acceleration map shown in FIG.

  Next, an embodiment of the present invention will be described.

(A) Description of Configuration of Embodiment FIG. 1 is a diagram illustrating a control device for a switched reluctance motor according to an embodiment of the present invention. As shown in this figure, the control device 20 of the switched reluctance motor includes a current command map 21, an energization rate map 22, an energization phase map 23, a PWM (Pulse Width Modulation) duty calculation unit 24, a drive phase selection unit 25, and a rotation. The speed detection unit 26, the rotation position detection unit 27, the map storage unit 28, the commutation signal generation unit 29, and the drive signal generation unit 30 are main components, and the arm driver 51 is controlled based on the torque command 10. Electric power is supplied from a battery 50 to an SR (Switched Reluctance) motor 53 to control it.

  Here, for example, when the SR motor 53 is mounted on an electric vehicle and used as a power source, the torque command 10 is a value corresponding to an operation amount (depression amount) of an accelerator pedal. It is made into the range of -100%. The current command map 21 has a map in which the torque command value and the current command value are stored in association with each other as shown in FIG. 2B. The current command map 21 selects and outputs a current command value corresponding to the torque command value. To do. Note that the current command value refers to a target value of a current flowing through each winding of the SR motor 53.

  The energization rate map 22 has a map in which the torque command value and the energization rate are stored in association with each other as shown in FIG. 2A, and selects and outputs the energization rate corresponding to the torque command value. It should be noted that the energization rate refers to the phase that is energized (hereinafter referred to as “energized phase”) and the phase that is not energized (when energizing only a part of the phases) when the SR motor 53 is energized (when energizing only a part of the phases). The ratio is hereinafter referred to as “non-energized phase”. In the example of FIG. 2A, when attention is paid to a series of nine phases that are energized according to the rotation of the SR motor 53, the energization rate is 3/9 when the three phases are energized. The energization rate 9/9 is energized to all phases.

  As shown in FIG. 3, the energization phase map 23 stores an energization pattern corresponding to the energization rate supplied from the energization rate map 22, and reads and outputs the energization pattern corresponding to the energization rate. In FIG. 3, ◯ indicates the energized phase, and x indicates the non-energized phase.

In this embodiment, not all the phases are energized, but a method of energizing a part of the phases is adopted. This will be described in detail. In a general SR motor, the torque is controlled by energizing all three phases of U, V, and W and adjusting the current flowing in the winding. On the other hand, in this embodiment, as shown in FIG. 2A, for example, when the torque command value is less than T2a, the energization rate is set to 3/9, and as shown in No. 1 in FIG. Only the phases are energized, and energization is stopped (thinned out) for the V and W phases. At this time, as shown in FIG. 2B, the current command value increases as the torque command value increases. In the range where the torque command value is T2a or more and less than T2f, as shown in FIG. 2B, the current command value is constant at I7, and the energization rate is 4/9 to 8 / according to the increase of the torque command value. It increases in the range of 9. For example, when the energization rate is 4/9, the first, third, fifth, and seventh U, W, V, and U phases are energized as indicated by No 2 in FIG. , The ninth V, U, W, V, W phase is deenergized. When the torque command value is equal to or greater than T2f, the energization rate is 9/9 (see No. 7 in FIG. 3) and all phases are driven, and the current command value increases as the torque command value increases. .

  The PWM duty calculation unit 24 calculates the duty of the current flowing from the arm driver 51 to the SR motor 53, detected by the current sensor 52, using the current command value supplied from the current command map 21 as a target value, and a drive signal generation unit 30.

  The drive phase selection unit 25 selects a phase to be driven based on the energization pattern (see FIG. 3) supplied from the energization phase map 23 and notifies the map storage unit 28 and the commutation signal generation unit 29. The rotation position detection unit 27 converts the analog signal output from the rotation detection sensor 54 into a digital signal and outputs the digital signal to the map storage unit 28, the commutation signal generation unit 29, and the rotation speed detection unit 26. The rotational speed detection unit 26 obtains the difference between the signals supplied from the rotational position detection unit 27, detects the rotational speed of the SR motor 53, and supplies it to the drive phase selection unit 25 and the map storage unit 28.

  The map storage unit 28 stores an advance angle map, an energization angle map, and a return angle map, selects a map according to the energization pattern, and advances and energizes according to the rotation speed, current command value, and the like. , And the reflux angle is acquired and output. Details of the advance angle, the energization angle, and the reflux angle will be described later with reference to FIG. FIG. 4 is a diagram showing details of the map stored in the map storage unit 28. As shown in this figure, the map storage unit 28 stores a first advance angle map and a second advance angle map as advance angle maps, and a first energization angle map, a second energization angle map, and The third conduction angle map is stored, and the first reflux angle map, the second reflux angle map, and the third reflux angle map are stored as the reflux angle map. FIG. 5 is a diagram illustrating the relationship between the energization pattern and the selected map. In FIG. 5, the target phase indicates a phase to be controlled, the previous phase indicates the phase immediately before the target phase, and the rear phase indicates the phase immediately after the target phase. Here, ◯ indicates an energized phase, and x indicates a non-energized phase. In addition, when an object phase is x, it is not described in FIG. Here, when both the front phase and the rear phase are ◯ (in the first row), the first advance map is selected. When the front phase is ◯ and the rear phase is X (in the second row), the first advance angle map, the first conduction angle map, and the first return angle map are selected. When the front phase is x and the rear phase is o (in the third row), the second advance angle map, the second conduction angle map, and the second return angle map are selected. When both the front phase and the rear phase are x (in the case of the fourth row), the second advance angle map, the third conduction angle map, and the third return angle map are selected. As described above, the map storage unit 28 selects a map corresponding to the energization pattern of the front and rear phases supplied from the drive phase selection unit 25, and detects the current command value supplied from the current command map 21 and the rotation speed detection. The advance angle, energization angle, and reflux angle corresponding to the rotation speed value supplied from the unit 26 are acquired from the selected map and supplied to the commutation signal generation unit 29.

  The commutation signal generation unit 29 forms U-phase, V-phase, and W-phase energization pattern signals based on the rotational position detected by the rotational position detection unit 27. The formed energization pattern signal is adjusted in control timing based on the advance angle, energization angle, and return angle values supplied from the corresponding map stored in the map storage unit 28.

The drive signal generation unit 30 generates a PWM control signal based on the energization pattern signal supplied from the commutation signal generation unit 29 and the duty signal supplied from the PWM duty calculation unit 24, and supplies the PWM control signal to the arm driver 51. The generated PWM control signal is U phase, V phase or W phase.
The PWM signal based on the duty signal supplied from the PWM duty calculation unit 24 is superimposed on the phase energization pattern signal.

  The battery 50 is configured by a secondary battery such as a lead storage battery, a nickel cadmium battery, a nickel hydride battery, or a lithium ion battery, and supplies DC power to the SR motor 53 via the arm driver 51.

  The arm driver 51 switches the DC power output from the battery 50 in accordance with the drive signal supplied from the drive signal generation unit 30 and supplies it to the windings constituting each phase of the SR motor 53. FIG. 6 shows a configuration example of the arm driver. As shown in this figure, the arm driver 51 is configured by connecting in series a switching unit in which a diode and a field effect transistor (FET) are connected in parallel. More specifically, the switching units 60 </ b> H and 60 </ b> L are connected in series, these connection points are connected to the neutral point 64 of the winding of the SR motor 53, and both ends are connected to the battery 50. The switching units 61H and 61L are connected in series, these connection points are connected to the U phase of the winding, and both ends are connected to the battery 50. The switching units 62 </ b> H and 62 </ b> L are connected in series, these connection points are connected to the V phase of the winding, and both ends are connected to the battery 50. The switching units 63H and 63L are connected in series, these connection points are connected to the W phase of the winding, and both ends are connected to the battery 50. The switching units 60H to 63H and 60L to 63L are switched by the drive signal supplied from the drive signal generation unit 30, respectively. Note that a capacitor 65 for reducing high-frequency noise is connected to the battery 50 in parallel.

  U, V, and W phase windings are wound around the stator salient poles Su, Sv, and Sw that are opposed to each other with the rotation shaft of the SR motor 53 interposed therebetween. One end of each phase winding is connected to each other at the neutral point 64 and connected to the connection point of the switching units 60H and 60L, and the other end is connected to the connection point of the switching units 61H to 63H and 61L to 63L. ing. As shown in FIG. 7, the SR motor 53 includes a stator S and a rotor R disposed so as to be rotatable with respect to the stator S. The stator S includes a stator core SC in which a plurality of stator salient poles (Su, Sv, Sw) are integrally formed, and a U phase, a V phase, and a W phase wound around the stator salient poles (Su, Sv, Sw), respectively. Windings (U, V, W). The rotor R is integrally formed with a plurality of rotor salient poles (R1, R2, R3, R4).

  FIG. 8 is a diagram for explaining the advance angle, the energization angle, and the reflux angle in the present embodiment. FIG. 8 illustrates a case where the U phase is energized. FIG. 8A shows a state in which the stator salient pole Su and the rotor salient pole R1 are separated from each other through a state in which they face each other (state in FIG. 7A) (see FIG. 7B). The change of the inductance value of the U-phase winding until the state is reached is shown. As shown in FIG. 8A, the inductance increases as the stator salient pole Su and the rotor salient pole R1 approach each other, reaches a peak when they face each other, and decreases as they are separated. 8B shows the operation of the switching unit 60H, FIG. 8C shows the operation of the switching unit 61L, and FIG. 8D shows the current flowing in the U phase. In FIGS. 8A and 8B, high indicates that the FET constituting the switching unit is on, and low indicates that it is off. Here, the switching units 60H and 61L start the switching operation before the angle Ta at which the inductance increases, and this Ta is referred to as an advance angle. In addition, an angle To that keeps the switching unit 60H on is referred to as a conduction angle. Further, the switching unit 61L is intermittently turned on / off by PWM control, but the angle Tr from when the switching unit 61L is finally turned off to when the switching unit 60H is turned off. Is referred to as the reflux angle. As a result of such switching control, a current as shown in FIG. 8D is passed through the U-phase winding.

(B) Description of Operation Principle of Embodiment First, the operation principle of this embodiment will be described. FIG. 9 is a diagram for explaining the energization pattern of each phase. Here, FIG. 9A is a diagram for explaining a conventional energization pattern of each phase. As shown in FIG. 9A, in the conventional case, a current is supplied to the windings every 120 degrees in accordance with the rotation of the rotor. More specifically, in FIG. 6, when the U phase is energized, the switching unit 60H and the switching unit 61L are turned on, the switching unit 60H, the neutral point 64, the U phase winding, and the switching Current flows from the battery 50 via the unit 61L. Next, when energizing the V phase, the switching unit 60L and the switching unit 62H are turned on, and the switching unit 62H, the V phase winding, the neutral point 64, and the switching unit 60L are passed through. Current flows from the battery 50. Subsequently, when the W phase is energized, the switching unit 60H and the switching unit 63L are turned on, via the switching unit 60H, the neutral point 64, the W phase winding, and the switching unit 63L. Current flows from the battery 50. When the U phase is energized again, the switching unit 60L and the switching unit 61H are turned on, and the switching unit 61H, the U phase winding, the neutral point 64, and the switching unit 60L are passed through. Thus, current flows from the battery 50.

  Here, since the switching units 60L and 60H are alternately switched, it is necessary to prevent the switching timing from overlapping between adjacent phases. Otherwise, the switching units 60L and 60H are simultaneously turned on, and the output of the battery 50 is short-circuited. Therefore, conventionally, as shown in FIG. 9 (A), each phase has been subjected to switching control within a range not exceeding 120 degrees.

  On the other hand, in the present embodiment, depending on the state of the SR motor 53, as shown in FIG. This is for preventing the phase current from decreasing and the efficiency from decreasing when the torque command value is relatively small. This will be described in detail. As shown in FIG. 7A, the rotor salient poles R1 and R3 formed on the rotor R are completely opposed to the stator salient poles Su and Su around which the U-phase winding is wound. The SR motor 53 is shown in a state where it is in a fully-opposed state. In the figure, the magnetic flux φ1 is SR in which the rotor salient poles R1 and R3 formed in the rotor R are completely opposed to the stator salient poles Su and Su around which the U-phase winding is wound. In the motor 53, when a phase current is supplied to the U-phase winding, the magnetic flux formed in the SR motor 53 using the stator salient poles Su and Su as a magnetic circuit is shown. In the magnetic flux formed in 53, the maximum magnetic flux amount is obtained.

  FIG. 7B shows a state in which the rotor salient poles R1 and R3 formed on the rotor R are completely opposed to the stator salient poles Su and Su around which the U-phase winding is wound. The SR motor 53 is shown (in a completely non-opposing state). In the figure, the magnetic flux φ2 is such that the rotor salient poles R1 and R3 formed on the rotor R are completely non-opposing to the stator salient poles Su and Su around which the U-phase winding is wound. In the SR motor 53, when current is supplied to the U-phase winding, the magnetic flux formed in the SR motor 53 using the stator salient poles Su and Su as a magnetic circuit is shown. The minimum amount of magnetic flux in the magnetic flux formed at 53 is obtained.

  Similar to the U-phase winding, the phase current is commutated and sequentially supplied to the V-phase and W-phase windings. The magnetic flux formed by using the stator salient poles Sv, Sv, Sw, Sw around which the V-phase and W-phase windings are wound as a magnetic circuit also changes between the magnetic flux φ1 and the magnetic flux φ2.

FIG. 10 shows the relationship between the phase current supplied to the SR motor 53, the magnetic flux φ1, and the magnetic flux φ2. The motor torque acting on the rotor R of the SR motor 53 is proportional to the area surrounded by the magnetic flux φ1, the magnetic flux amount of the magnetic flux φ2 and the current value i of the phase current in FIG. Further, as the current value of the phase current supplied to each of the U-phase, V-phase, and W-phase windings increases, the amount of magnetic flux φ1 and magnetic flux φ2 also increases, and when the current value i1 is exceeded, the magnetic flux φ1 and magnetic flux φ2 are increased. The increase in the amount of magnetic flux becomes slow and gradually approaches the upper limit value.

  When the current value of the phase current is the current value i1, a motor torque proportional to the area A1 acts on the rotor R. When the current value i2 of the phase current is about twice the current value i1, the motor torque proportional to the area A3 obtained by adding the area A2 to the area A1 acts on the rotor R.

  When the current value of the phase current is less than the current value i1, the difference in the magnetic flux amount between the magnetic flux φ1 and the magnetic flux φ2 is small, whereas when the current value of the phase current exceeds the current value i1, the magnetic flux φ1 and the magnetic flux φ2 The difference in the amount of magnetic flux is large and becomes a substantially constant value. Therefore, the area A3 when the current value i2 of the phase current is about twice the current value i1 is about three times the area A1 when the current value of the phase current is the current value i1. . Therefore, the efficiency of the SR motor 53 is higher when the current value of the phase current supplied to the SR motor 53 is larger. When it is desired to drive the SR motor 53 with high efficiency, the magnetic flux formed in the SR motor 53 is increased. It is better to supply a phase current having a current value of a predetermined magnitude that saturates.

  FIG. 11 shows a case where a current value i1 and a phase current having a current value i2 (i2≈2 × i1) approximately twice the current value i1 are supplied to the U-phase, V-phase, and W-phase windings. The time change of the phase current is shown. In order to efficiently rotate the rotor R in the driving direction, it is desirable that the phase current is supplied to the U-phase, V-phase, and W-phase windings only in the “positive torque region”. However, in the “positive torque region”, it takes some time before the phase current that has been applied to the U-phase, V-phase, and W-phase windings attenuates and no longer flows through the U-phase, V-phase, and W-phase windings. Cost. Therefore, even in the “negative torque region”, a phase current is applied to the U-phase, V-phase, and W-phase windings, and the driving efficiency of the rotor is reduced by this phase current.

  11A and 11B, when the phase currents having the current value i1 and the current value i2 are supplied to the U-phase, V-phase, and W-phase windings, “the area of the“ positive torque region ” The torque proportional to the area obtained by subtracting “the area of the“ negative torque region ”” acts on the rotor R. Here, as shown in FIG. 11 (A) and FIG. 11 (B), compared with the ratio of “area of“ negative torque region ”” to “area of“ positive torque region ”” at current value i 1. The ratio of the “area of the“ negative torque region ”” to the “area of the“ positive torque region ”” when the current value i2 is larger than the current value i1 is smaller.

  That is, the SR motor 53 is more efficient when the phase current having the current value i2 is supplied to the U-phase, V-phase, and W-phase windings than the current value i1. Therefore, also from the viewpoint of the time change of the phase current, when it is desired to drive the SR motor 53 with high efficiency, a phase current having a predetermined current value at which the magnetic flux formed in the SR motor 53 is saturated is supplied. Better.

  For the reasons described above, in this embodiment, when the current value is low, the efficiency is increased by thinning out the phases and increasing the phase currents leading to the respective phases as shown in FIG. 9B. ing.

As described above, in this embodiment, the phases are thinned and energized, but by decimation of the phases, a non-energized phase that is a phase that is not energized is generated. Specifically, for example, when the phases are thinned out at a rate of 50%, as shown in FIG. 9B, there are non-energized phases before and after the energized phases. Thus, when there is a non-energized phase before and after the energized phase (both before and after in the example of FIG. 9B), the angle at which each phase is energized can be set in a range exceeding 120 degrees. . For example, in the example of FIG. 9C, the conduction angle is set to exceed 120 degrees. The example of FIG. 9C is an example in which only the energization angle is increased, but in addition to the energization angle, the advance angle and the reflux angle shown in FIG. 8 can be adjusted. . FIG. 12 shows an example of adjusting the advance angle, the energization angle, and the reflux angle. Here, FIG. 12A shows the timing of energization control when the phase is not thinned, and FIG. 12C shows the current waveform of the phase current when the phase is not thinned. FIG. 12B shows the timing of energization control when adjusting the advance angle, energization angle, and reflux angle when thinning out the phase, and FIG. 12D shows the case when thinning out the phase. The current waveform of the phase current is shown. From these comparisons, when thinning out the phases, the advance angle, energization angle, and reflux angle can be adjusted by including the non-energized phase existing before and after the target phase within the adjustable range. . For this reason, since an advance angle etc. can be adjusted in a wider range, further optimization can be aimed at and efficiency can be improved. Of course, in some cases, it is possible to set the advance angle or the like within a range not exceeding 120 degrees.

  For the advance angle, the energization angle, and the return angle, optimum values corresponding to the rotational speed of the SR motor 53 and the current command value are obtained in advance by experiments or simulations and stored in the map storage unit 28. The optimum advance angle, energization angle, and reflux angle corresponding to the rotation speed and the current command value are acquired from the map storage unit 28 and set. Thereby, the efficiency of the SR motor 53 can be increased. In the above description, the case where the energization rate is 50% has been described as an example. However, in this embodiment, the advance angle and the like can be adjusted even with other energization rates. Details thereof will be described below.

(C) Description of Detailed Operation of Embodiment Next, detailed operation of the present invention will be described. When the SR motor 53 is mounted on a vehicle and is used as a drive source, if the accelerator is operated and the torque command value increases, the torque command value is supplied to the current command map 21 and the current ratio map 22. . In the current command map 21, a current command value corresponding to the torque command is selected and output based on the broken line shown in FIG. For example, when the torque command value is a predetermined value less than T2a, a predetermined value less than I7 is selected and output as the current command value. When the torque command value is equal to or greater than T2a and less than T2f, I7 is selected as the current command value. Further, when the torque command value is equal to or greater than T2f, a corresponding value between I7 and I6 is selected as the current command value. The current command value selected in this way is supplied to the PWM duty calculation unit 24 and the map storage unit 28.

  The energization rate map 22 obtains the energization rate according to the torque command value from the broken line shown in FIG. 2 (A) and outputs it to the energization phase map 23. Specifically, when the torque command value is less than T2a, 3/9 is selected as the energization rate, and when T2a is less than T2f and less than T2f, the energization rate is a corresponding value between 4/9 and 8/9. Is selected, and when the torque command value is equal to or greater than T2f, 9/9 is selected and output as the energization rate.

  The energization phase map 23 selects and outputs an energization phase map corresponding to the energization rate supplied from the energization rate map 22. Specifically, when the energization rate is 3/9, the No. 1 (first row) energization phase map (◯ XXX × XXX) shown in FIG. 3 is selected and output. When the energization rate is 4/9, the No. 2 (second line) energization phase map (◯ × ○ × ○ × ○ ××) shown in FIG. 3 is selected and output. In the case of 5/9 to 9/9, the energized phase maps No. 3 to No. 7 are respectively selected and output.

When the rotational speed of the SR motor 53 is less than a predetermined rotational speed (for example, 1/10 of the maximum rotational speed), the drive phase selection unit 25 selects all phases regardless of the map supplied from the energized phase map 23. The driving phase map (supplied from No. 7 in FIG. 3 (○○○○○○○○○) as the energized phase map) is driven and the energized phase map 23 is supplied from the energized phase map 23 when the rotational speed is higher than the predetermined rotational speed. This is selected and supplied to the commutation signal generation unit 29 and the map storage unit 28. Specifically, when the rotational speed is equal to or higher than the predetermined rotational speed and 4/9 is selected as the energization rate, the energized phase map of No. 2 in FIG. ) Is selected and supplied to the commutation signal generation unit 29 and the map storage unit 28.

  Based on the energized phase map supplied from the drive phase selector 25 and the rotational position supplied from the rotational position detector 27, the map storage unit 28 energizes the target phase as the phase that is currently controlled. If it is a phase or a non-energized phase and the target phase is an energized phase, the previous phase that is the phase immediately before the target phase and the rear phase that is the next phase from the energized phase map The state of is identified. For example, when the target phase is the energized phase (O), the previous phase is the energized phase (O), and the rear phase is the energized phase (O), this corresponds to the information on the first row shown in FIG. Therefore, the first advance angle map is selected. Then, the map storage unit 28 acquires the rotation speed supplied from the rotation speed detection unit 26 and the advance angle corresponding to the current command value supplied from the current command map 21 from the first advance map, and the commutation The signal is supplied to the signal generator 29. When the target phase is ◯, the previous phase is ◯, and the rear phase is ×, it corresponds to the information on the second row shown in FIG. 5, so the first advance angle map, the first conduction angle Select map, first reflux angle map. And the map memory | storage part 28 acquires the advance angle corresponding to the rotation speed supplied from the rotation speed detection part 26, and the electric current command value supplied from the electric current command map 21 from a 1st advance angle map, and sets an energization angle. Obtained from the first conduction angle map, the reflux angle is obtained from the first reflux angle map, and is supplied to the commutation signal generation unit 29. When the target phase is ○, the previous phase is ×, and the rear phase is ○, the second advance angle map, the second conduction angle map, and the second reflux angle map are selected, the target phase is ○, and the previous phase is ×. When the rear phase is x, the second advance angle map, the third energization angle map, and the third return angle map are selected, and the advance angle, the energization angle, and the return angle corresponding to the rotation speed and the current command value are each maps. And is supplied to the commutation signal generation unit 29.

  The commutation signal generation unit 29 includes an energized phase map indicating whether the target phase supplied from the drive phase selecting unit 25 is an energized phase or a non-energized phase, and a rotational position supplied from the rotational position detecting unit 27. The energization pattern signal is generated based on the advance angle, the energization angle, and the return angle supplied from the map storage unit 28 and supplied to the drive signal generation unit 30.

The drive signal generation unit 30 controls the arm driver 51 based on the energization pattern signal supplied from the commutation signal generation unit 29. As a result, when the SR motor 53 is less than a predetermined rotation speed (for example, 1/10 of the maximum rotation speed), all-phase driving (driving rate 100%) is performed, and the energization pattern as shown in FIG. It is driven by. In this case, since there is no non-energized phase, the energized angle and the reflux angle cannot be extended. Therefore, the advance angle of all phases is adjusted based on the first advance angle map. Further, when the SR motor 53 is equal to or higher than a predetermined rotation speed, an energization rate corresponding to the torque command value is selected, and an energization phase map corresponding to the selected energization rate is selected. For example, when (Oxxx XXXX) is selected as the energized phase map, the advance angle map, energized angle map, and reflux angle map corresponding to the energized state of the target phase and the front and rear phases are selected. At the same time, the advance angle, the energization angle, and the return angle corresponding to the rotation speed and the current command value are acquired from these maps, and the target phase is controlled. More specifically, when (○ ×× ○ ×× ○ ×) is selected as the energized phase map, and the target phase is the fourth ○ from the front, the energization pattern is (× ○ × Thus, the second advance angle map, the third energization angle map, and the third return angle map are selected, and the advance corresponding to the rotational speed and the current command value is selected. The angle, the energization angle, and the reflux angle are selected from each map, and the target phase is controlled. When the energization pattern is (× ○ ×), since the front phase is a non-energization phase, the advance angle can be adjusted to an optimum angle within a wider range than usual, and the rear phase is also non- Since it is an energized phase, the energization angle and the reflux angle can be adjusted to an optimum angle within a wider range than usual. When the energization pattern is (XX), the energization angle and the reflux angle are within a wider range than usual based on the first advance angle map, the first energization angle map, and the first return angle map. It is adjusted to the optimum angle. Further, when the energization pattern is (× ○○), an optimum angle within a wider range than usual based on the second advance angle map, the second energization angle map, and the second return angle map. Adjusted to

  The arm driver 51 switches the switching units 60 </ b> H to 63 </ b> H and 60 </ b> L to 63 </ b> L according to the drive signal supplied from the drive signal generation unit 30, and the DC power output from the battery 50 is wound on each phase of the SR motor 53. Supply to the wire. Thereby, the rotor R rotates. At this time, the current supplied from the arm driver 51 to each phase is detected by the current sensor 52 and notified to the PWM duty calculation unit 24. The rotation position of the rotor R is detected by the rotation detection sensor 54 and notified to the rotation position detection unit 27. By these detection signals, feedback control is performed so that the current supplied to the SR motor 53 and the rotation speed are appropriate.

  FIG. 13 is a flowchart for explaining the operation flow of the present embodiment. As shown in this flowchart, the following processing is executed in the present embodiment.

  In step S10, the drive phase selection unit 25 acquires information on the target phase as a phase to be controlled, that is, information indicating whether the target phase is an energized phase or a non-energized phase from the energized phase map 23, This is supplied to the stream signal generator 29.

  In step S11, the commutation signal generation unit 29 determines whether or not the target phase is ◯ (energized phase). If the target phase is an energized phase (step S11: Yes), the process proceeds to step S12, and × (non- If it is an energized phase (step S11: No), the process is terminated.

  In step S <b> 12, the commutation signal generation unit 29 acquires information on the front phase and the rear phase from the energized phase map. Specifically, the rotational position of the rotor is specified by information from the rotational position detector 27, the target phase is specified from the energized phase map, and the phases before and after the target phase are specified.

  In step S13, the map storage unit 28 selects a corresponding map according to the energization pattern of the front and rear phases specified in step S12. For example, when the energization pattern is “XX”, the first advance angle map, the first energization angle map, and the first return angle map are selected as shown in FIG.

  In step S14, energization control is executed based on the map selected in step S13. Specifically, the map storage unit 28 acquires the set values of the advance angle, the energization angle, and the return angle according to the current command value and the rotation speed value from each map selected in step S13, and acquires the commutation signal. It supplies to the production | generation part 29. FIG. The commutation signal generation unit 29 generates an energization pattern signal based on the advance angle, the energization angle, and the reflux angle supplied from the map storage unit 28 and supplies the energization pattern signal to the drive signal generation unit 30. The drive signal generation unit 30 controls the arm driver 51 according to the energization pattern signal supplied from the commutation signal generation unit 29 and the duty signal supplied from the PWM duty calculation unit 24. Accordingly, a corresponding map is selected from the map storage unit 28 according to the energized phase pattern, and the advance angle, energized angle, and reflux angle are optimized according to the rotation speed and the current command value according to the selected map. Therefore, the SR motor 53 can be driven efficiently.

As described above, according to the present embodiment, when the SR motor 53 is thinned and energized, the advance angle map, the energization angle map, and the reflux angle map corresponding to the energization pattern of the energization phase map are selected, From these selected maps, the advance angle, the energization angle, and the reflux angle corresponding to the rotation speed and the current command value are specified, and the energization control is performed. For this reason, when there is a non-energized phase before and after the energized phase, the non-energized phase is also included in the adjustable range and set to an optimal advance angle or the like according to the rotational speed and the current command value. The motor 53 can be driven efficiently.

  Further, in the present embodiment, a plurality of maps corresponding to the energization patterns are stored in the map storage unit 28, and the corresponding map is selected according to the energization patterns. The energization angle and the reflux angle can be appropriately controlled.

(E) Description of Modified Embodiment The above embodiment is an example, and it is needless to say that the present invention is not limited to the case as described above. For example, in the above embodiment, all of the advance angle, the energization angle, and the reflux angle are controlled. However, for example, any one or any two of them may be controlled.

  In the above embodiment, the arm driver 51 has been described by taking the 4-arm driver shown in FIG. 6 as an example, but a 6-arm driver may be used. Further, although the SR motor 53 has been described with an example in which the stator salient poles are 6 poles and the rotor salient poles are 4 poles, a combination of other numbers may be used.

  In the above embodiment, as the energization phase map, as shown in FIG. 3, a combination of nine patterns is selected and the energization rate is selected from the range of 3/9 to 9/9. It is good also as a combination. For example, the energized phase map may be a combination of 96 patterns, and may be selected from the range of 32/96 to 96/96. Of course, other combinations may be used.

  In the above embodiment, the advance angle map, the energization angle map, and the return angle map stored in the map storage unit 28 include the current command value and the rotation speed, the advance angle, the energization angle, and the return angle. Although the map in which each of the above is associated is described as an example, for example, the torque command value and the rotation speed may be associated with the advance angle, the energization angle, and the reflux angle. Of course, other parameters may be used.

  In the above embodiment, the control is performed according to the torque command value. However, when the SR motor 53 is mounted on the vehicle, the phase is thinned according to the vehicle speed when the vehicle is accelerated, and the phase Control of advance angle or the like may be performed along with thinning. FIG. 14 is a diagram illustrating an embodiment in which such control is performed. In FIG. 14, the same reference numerals are given to the portions corresponding to those in FIG. In FIG. 14, the energization rate map 22 and the energization phase map 23 are excluded as compared with FIG. 1, and the acceleration map 71, timer 72, comparison unit 73, torque command unit 74, and rotational speed vehicle speed conversion unit 75 are excluded. Is newly added, and the accelerator opening 70 is input to the acceleration map 71. The rest is the same as in the case of FIG.

Here, the accelerator opening 70 indicates the opening (operation amount) of an accelerator pedal for accelerating the vehicle. The acceleration map 71 has an optimal (highly efficient) acceleration curve corresponding to the accelerator opening, selects an acceleration curve corresponding to the accelerator opening, and corresponds to the time information supplied from the timer 72. Is supplied to the comparison unit 73 as a target speed. FIG. 15 shows an example of the acceleration map. In FIG. 15, curves A1 to A4 are acceleration maps, and a curve R shows a change in the actual speed of the vehicle. A curve A1 is a case where the accelerator opening is small, and the accelerator opening becomes higher in the order of curves A2, A3, A4. For example, when the curve A4 is selected as the acceleration map, the vehicle speed is controlled to change along the curve A4 as shown by the curve R. By controlling in this way, even when the accelerator is operated suddenly, consumption of the battery 50 can be suppressed by preventing rapid acceleration. Specifically, it is said that if the control is performed to accelerate to 20 km / h in 5 seconds (acceleration is 1.11 m / s ² ), it is said that the efficiency is high. Even if it is operated, the acceleration map 71 is set so as to achieve such acceleration. In addition, although the acceleration map shown in FIG. 15 is four types of A1-A4, it may be more or less than this.

  The timer 72 generates time information and supplies it to the acceleration map 71. The comparison unit 73 compares the vehicle speed supplied from the rotational speed vehicle speed conversion unit 75 with the target speed supplied from the acceleration map 71 and outputs the comparison result to the torque command unit 74. The torque command unit 74 supplies a torque command value to the current command map 21 based on the comparison result supplied from the comparison unit 73. Specifically, “80%” is output as the torque command when the vehicle speed is equal to or lower than the target speed, and “0%” is output as the torque command when the vehicle speed exceeds the target speed. The rotation speed vehicle speed conversion unit 75 converts the rotation speed supplied from the rotation speed detection unit 26 into a vehicle speed.

  Next, the operation of the embodiment of FIG. 14 will be described. When the accelerator of the vehicle is operated, the accelerator opening is supplied to the acceleration map 71. The acceleration map 71 selects a curve corresponding to the accelerator opening, acquires the speed corresponding to the time information supplied from the timer 72, and supplies it to the comparison unit 73. For example, when the curve A4 is selected, the speed corresponding to the elapsed time from the start of the accelerator operation is acquired from the curve A4 and supplied to the comparison unit 73.

  The comparison unit 73 compares the speed (target speed) supplied from the acceleration map 71 with the vehicle speed supplied from the rotational speed vehicle speed conversion unit 75 and outputs a comparison result. The torque command unit 74 outputs a torque command “80%” when the vehicle speed is equal to or lower than the target speed, and outputs a torque command “0%” when the vehicle speed exceeds the target speed. Here, the torque command “80%” is an efficient torque value. Of course, other values may be used depending on the type of the vehicle and the SR motor 53.

  The current command map 21 supplies a current command corresponding to the torque command value to the PWM duty calculation unit 24. The drive phase selection unit 25 selects all phases as drive phases when the rotation speed is lower than a predetermined rotation speed (for example, 1/10 of the maximum speed), and according to the torque command value otherwise. The selected drive phase is selected and supplied to the commutation signal generation unit 29 and the map storage unit 28. Further, when the torque command value is “0%”, the drive phase selection unit 25 sets the next phase of the target phase as a non-energized phase.

  By comparing the vehicle speed with the acceleration map 71, if the vehicle speed exceeds the curve that is the target of the acceleration map, the next phase of the target phase will be the non-energized phase, and the vehicle speed will be below the curve that is the target of the acceleration map. In such a case, energization of the phase is executed with an energization pattern corresponding to the torque command value (“80%”). Therefore, since the non-energized phase and the energized phase are generated depending on the relationship between the vehicle speed and the acceleration map, the map storage unit 28 has an advance angle map, an energized angle map, Then, the return angle map is selected, the advance angle, the energization angle, and the return angle corresponding to the rotation speed and the current command value are acquired from each map, and the commutation signal generation unit 29 is based on the acquired information. An energization pattern signal is generated, and the drive signal generation unit 30 executes energization control.

  As described above, according to the embodiment shown in FIG. 14, since acceleration control is performed based on the acceleration map 71, efficient acceleration can be executed, and thus consumption of the battery 50 is suppressed. Can do. Further, since efficient acceleration is automatically performed, the driver can drive without worrying about the accelerator operation.

Further, according to the embodiment shown in FIG. 14, when performing the thinning-out control, the advance angle, the energization angle, and the reflux angle are set according to the energization pattern, so that the efficiency can be further improved. .

20 Controller 21 Current command map 22 Energization rate map 23 Energized phase map (setting means)
24 PWM duty calculation unit 25 Drive phase selection unit 26 Rotational speed detection unit 27 Rotation position detection unit 28 Map storage unit (adjustment means)
29 Commutation signal generator (adjustment means)
30 Drive signal generator (energizing means)
50 battery 51 arm driver 52 current detection sensor 53 SR motor 54 rotation detection sensor

Claims (6)

It has multiple phase windings connected to each other at the neutral point, and supplies current from each phase to the neutral point or current from the neutral point to each phase according to the rotational position of the rotor. In the control device of the operated switched reluctance motor,
Setting means for setting a phase to be sequentially controlled according to rotation of the rotor to either an energized phase as an energized phase or a non-energized phase as a non-energized phase;
When the phase to be controlled is set as the energized phase according to the rotation of the rotor, energizing means for energizing the phase;
Adjusting means for adjusting the timing of control of the current flowing in the winding of the phase by a combination of energized / non-energized phases of the phases before and after the phase energized by the energizing means;
A control apparatus for a switched reluctance motor, comprising:   2. The switched state according to claim 1, wherein when the previous phase of the phase to be controlled is a non-energized phase, the non-energized phase is also included in the adjustable range, and the energization start timing is adjusted. Control device for reluctance motor.   The timing of the end of energization is adjusted by including the non-energized phase in the adjustable range when the rear phase of the phase to be controlled is a non-energized phase. Switched reluctance motor control device.   The timing of returning the current generated in the winding is adjusted by including the non-energized phase in the adjustable range when the rear phase of the phase to be controlled is a non-energized phase. The switched reluctance motor control device according to any one of claims 1 to 3.   The adjustment means has a table in which a pattern of a combination of energized / non-energized phases of phases before and after the phase to be controlled is associated with a map indicating the timing of control in each pattern, 5. The switched reluctance motor control device according to claim 1, wherein a corresponding map is selected based on the pattern, and a control timing is adjusted based on the selected map. 6. The switched reluctance motor is mounted on a vehicle to drive the vehicle,
The setting means sets the energized phase and the non-energized phase so that the vehicle has a predetermined acceleration according to an operation amount of an accelerator.
The switched reluctance motor control device according to any one of claims 1 to 5.

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