JP2012135103A - Motor drive control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a delay of control in cases where a CPU is used to control electric conduction of a switched reluctance motor (SR motor), or the object to be controlled, thereby increasing the torque of the SR motor at low cost to ensure that there will be no lack of torque in a high rotation range.SOLUTION: A control timing and a control content determined by a rotation position of an SR motor, or the object to be controlled, when its state is transitioned to PWM control by letting currents in at lease energization phase stator coils Lu, Lv and Lw go high are calculated using a CPU by an arithmetic unit 41a, and when the position detected by a position sensor 2 reaches a position of the control timing stored in a data map 12, an interrupt signal is generated by an encoder 14. Based on this interrupt signal, a control command signal of the control content is sent to a drive control unit by an input/output controller 13, whereby an inverter, or a drive unit of the SR motor, is controlled through direct memory access.

Description

  The present invention relates to a motor drive control device for energizing a coil of an energized phase of a switched reluctance motor to be controlled by PWM control, and more particularly to energization control using a CPU.

  2. Description of the Related Art Conventionally, a switched reluctance motor (hereinafter referred to as an SR motor) has attracted attention as a drive motor for an electric vehicle or a hybrid vehicle. The SR motor is also called a switched reluctance motor.

  FIG. 9 shows a schematic structure of an example of an SR motor 100 having a radial gap configuration of U, V, and W three-phase driving. The SR motor 100 is coaxial with a rotor 200 attached to a motor shaft 101 and outside thereof. And a stator 300 provided in the above. The rotor 200 has a plurality of salient poles 201 arranged at equal intervals on the outer peripheral surface side. In the stator 300, salient poles 301 of each phase as stator magnetic poles are arranged on the inner peripheral surface side in order in a direction facing the salient pole 201, and each salient pole 301 has a coil (coil) of each phase. ) 302 is concentrated. Unlike the number of salient poles 201 of the rotor 200 (eight in FIG. 9) and the number of salient poles 301 of the stator 300 (12 in FIG. 9), twelve of the stator 300 (= 3 (phase) × 4 (the number of salient poles)) forms a magnetic pole in the order of U, V, W, U, V, W.

  The SR motor 100 is driven by PWM (pulse width modulation) control of energization of the coil 302 of the driving phase of the stator 300 by the motor drive control device, and every time the rotor 200 is not opposed to the stator 300, In other words, the drive phase is switched at every predetermined rotation angle of the rotor 200, and the drive current controlled to the target current Ik according to the torque command value calculated from the accelerator opening degree by the PWM control is applied to the coil 302 of the drive phase. The rotor 200 is rotated and driven by the electromagnetic action of the rotor 200 and the stator 300 (for example, Patent Document 1 (paragraphs [0004], [0011]-[0014], FIG. 1, FIG. 3, FIG. 5, etc.)). reference).

  The SR motor is not only formed in a radial gap structure in which the rotor 200 is disposed concentrically and rotatably on the outer peripheral side of the stator 300 as in the SR motor 100 described above, but the stator and the rotatable rotor are motorized. It is also formed in an axial gap structure arranged so as to face the axial direction. The axial gap structure has an advantage that the salient pole area opposed to the radial gap structure can be widened, and is small and has high torque.

JP-A-9-182490

  When energization control of the energization phase coil of the SR motor stator is performed by PWM control using a CPU as described in Patent Document 1, at least the generated torque when starting energization of the energization phase coil is maximized. At the start of energization, the energized phase switching element of the drive unit such as an inverter is continuously turned on, the energized phase coil is energized continuously to quickly start up and shift to PWM control. Further, at the end of energization, it is conceivable to immediately turn off the energization phase switching element of the drive unit to end the PWM control, and to quickly reduce the current of the coil to 0 to quickly switch the energization phase.

  In this case, if the CPU performs continuous ON control at the start of energization and continuous OFF control at the end of energization, the rotation angle (control timing) and control of the start of energization, the arrival of the target current, and the end of energization are controlled. The SR motor detected by the position sensor is calculated by the CPU based on the required torque command value and the detection result of the current of each phase of the SR motor. Drive control of the switching element of the energized phase of the drive unit such as the inverter of the SR motor based on the calculated control content when the rotation angle of the motor reaches the rotation angle at the start of energization, the arrival of the target current, and the end of energization Is switched by the CPU, continuous on-control from the start of energization to the rise to the target current, PWM control from the end of the target current to the end of energization, Until the start is performed continuously off control.

  When controlling using the CPU as described above, when starting or ending energization of the coil in the energized phase, the control content necessary for PWM control or the like is saved in the memory prior to control switching. Pre-processing is required, and accordingly, switching of control takes time and the switching timing is delayed. In addition, if the CPU is executing another process with a high priority, the control is switched after waiting for the completion of the process, so that the control is further delayed.

  When the switching of the control is delayed, the torque generated due to a delay in the rise of the current in the energized phase coil at the start of energization decreases. Moreover, before the coil current reaches the target current, the rotation angle is reached and the control shifts to PWM control, and the coil current during PWM control becomes smaller than the target current and torque may become insufficient. This is a problem at high rotation speeds where switching is fast. In addition, since the pre-processing as described above by the CPU is required even when the energization is ended, it takes time and control switching is delayed.

  FIG. 10 schematically shows a delay in switching the control when the CPU is used. FIG. 10A shows a pulse signal of, for example, 10 kHz for setting the carrier cycle Tc of the PWM control, and a solid line in FIG. ia is an example of the current waveform of the coil in the energized phase when there is no delay in control switching, and the solid line ib in FIG. 5B is an example of the current waveform of the coil in the energized phase when there is a delay in control switching.

  In the case of the current waveform of the solid line ia, since there is no delay in switching the control, the current of the coil in the energized phase rises quickly without delay from the timing of the rotation angle at the start of energization, and PWM control is performed after rising to the target current Ik. To quickly fall at the timing of the rotation angle after the end of energization. Therefore, sufficient torque is generated during the start of energization and during PWM control. On the other hand, in the case of the current waveform indicated by the solid line ib, control switching delays (delay τa at the start of energization, PWM control delay τb due to the arrival of the target current, delay τc at the end of energization) occur, Since the current shifts to the PWM control before the rising edge is delayed and reaches the target current Ik, the torque during the rising of the current and the PWM control becomes small.

  The present invention prevents a delay in control when energization of the SR motor to be controlled is controlled using a CPU to increase the torque of the SR motor at a low cost, so that a shortage of torque does not occur even in a high rotation range. The purpose is to do.

  In order to achieve the above-described object, a motor drive control device according to the present invention controls the energization of a coil in the energization phase of an SR motor to be controlled by PWM control of a drive unit synchronized with a carrier cycle. Computation processing means for calculating, by the CPU, control timing and control content determined by the rotational position of the SR motor when at least the current of the energized phase coil is raised to shift to PWM control, and the control timing and Storage means for storing the control content, detection means for detecting the rotational position of the SR motor, and interrupt signal generation for generating an interrupt signal when the detection position of the detection means reaches the control timing position And a drive for controlling the drive unit without passing the control command signal of the control content of the storage means by the input of the interrupt signal Feeding the control unit is characterized in that a control output unit for controlling the driving unit in a direct memory access (claim 1).

  In the motor drive control device according to the first aspect of the present invention, the timing of the detection angle of the detection means (rotational position) at the start of energization of the energized phase where at least the current of the energized phase coil is raised to shift to PWM control. ) Reaches the timing of the energization start angle calculated by the CPU and stored in the storage means, the interrupt signal generating means generates an interrupt signal.

  Based on this interrupt signal, the control output means sends the control command signal of the control content stored in the storage means together with the control timing of the energization start angle to the drive control section without going through the CPU, and directs the drive section. Since it is controlled by memory access, it is not necessary to switch the control by the CPU, and the energization start current can be obtained without waiting for the end of the pre-processing such as CPU memory saving and other high-priority processes necessary for the control switching. Start-up and subsequent transition to PWM control without delay in timing, prevent control delay when using a CPU, increase SR motor torque at a low cost, and lack of torque even in high speed range Can be prevented from occurring.

1 is a circuit connection diagram illustrating an overall configuration of a first embodiment of the present invention. FIG. 2 is a block diagram showing a detailed configuration of a part of FIG. 1. It is explanatory drawing of the example of an electric current change of SR motor by control of FIG. It is explanatory drawing of control of FIG. It is explanatory drawing of the example of an electric current change of SR motor by control of the 2nd Embodiment of this invention. It is a block diagram which shows a part of detailed structure of the 3rd Embodiment of this invention. It is explanatory drawing of the example of an electric current change of SR motor by control of FIG. It is explanatory drawing of the example of an electric current change of the SR motor of the 4th Embodiment of this invention. It is explanatory drawing of the structural example of SR motor of 3 phase drive. It is a clear figure of the current change of SR motor when control timing is delayed.

  Next, in order to describe the present invention in more detail, embodiments will be described in detail with reference to FIGS.

(First embodiment)
A first embodiment will be described with reference to FIGS.

  FIG. 1 shows the overall configuration of the motor drive control device of this embodiment, and the SR motor to be controlled is a three-phase drive SR motor 1 as a drive motor of an electric vehicle or a hybrid vehicle, for example. The SR motor 1 may have either a radial gap configuration or an axial gap configuration. For example, the SR motor 1 has a radial gap configuration similar to that of the SR motor 100 of FIG. 8, and its rotational position is a known position sensor such as a resolver or encoder. (Detection means of the present invention) 2 is detected.

  The motor drive control device of the present embodiment generally includes a three-phase inverter 3 that drives the SR motor 1 and its control unit 4.

  The input power source of the inverter 3 includes a power source 5 such as an in-vehicle battery and a capacitor 6 connected in parallel to the power source 5, and the power source voltage is detected by a voltage sensor 7.

  In the inverter 3, switching elements Sua and Sub of U-phase upper and lower arms are provided in series between the positive and negative power supply terminals p and n of the power supply 5 with the U-phase stator coil Lu of the SR motor 1 interposed therebetween. The switching elements Sva and Svb of the V-phase upper and lower arms are provided in series across the V-phase stator coil Lv of the SR motor 1, and the W-phase upper and lower arms of the SR motor 1 are sandwiched between the W-phase stator coils Lw. Switching elements Swa and Swb are provided in series. Each of the switching elements Sua to Swb is formed of an IGBT, an FET, or the like, and is made of an IGBT in FIG. The stator coils Lu, Lv, and Lw are obtained by connecting the coils 302 of the respective phases in FIG. 9 in series or in parallel.

  Further, between the positive power supply terminal p and the lower arm side ends of the stator coils Lu, Lv, Lw of each phase, the reflux / regeneration diodes Dua, Dva, whose cathode is connected to the power supply terminal p, Dwa is provided, and between the negative power supply terminal n and the upper arm side end of each phase of the stator coils Lu, Lv, Lw, an anode connected to the power supply terminal n, a reflux / regeneration diode Dub, Dvb and Dwb are provided.

  Further, the currents of the stator coils Lu, Lv, and Lw of each phase of the SR motor 1 are detected by the current sensors 8u, 8v, and 8w of the respective phases.

  The control unit 4 includes an arithmetic processing unit 41 and a drive control unit 42 that supplies a PWM control signal and the like to the switching elements Sua to Swb of each phase of the inverter 3 in accordance with a control command output from the arithmetic processing unit 41. The arithmetic processing unit 41 is configured as described below.

  FIG. 2 shows a configuration of the arithmetic processing unit 41. The arithmetic processing unit 41 composed of a microcomputer or the like is roughly composed of an arithmetic unit 41a and a synchronous energization control unit (PWM signal unit) 41b formed by CPU software processing. , An asynchronous energization control unit 41c, and an output (output port) unit 41d.

  The calculation unit 41a rotates based on a torque command value sent from a host device (not shown) based on depression of an accelerator pedal or the like, and a time change of the rotation angle θ of the SR motor 1 obtained from the rotation position of the position sensor 2. The number ω, the power supply voltage of the voltage sensor 7, the currents of the stator coils Lu, Lv, Lw of each phase of the current sensors 8 u, 8 v, 8 w, etc. are captured, and (1) the target corresponding to the torque command value by the target current calculation unit 9 A signal Sk of a command value of current Ik (more accurately, a converted voltage command value) is formed. (2) Based on the rotation angle ω of the SR motor 1, the angle calculation unit 10 causes the energization start angle, current rise angle (angle to reach the target current Ik) of each phase according to the rotation speed of the SR motor 1, PWM The transition angle (the angle of the reflux period) and the energization end angle are calculated. Further, when the energization is started (between the energization start angle and the current rise angle), the continuous ON control of the switching elements Sua to Swb, the reflux off control, the energization end (the next current rise angle from the energization end angle) In order to perform continuous OFF control of the switching elements Sua to Swb, the timing of the energization start angle, current rise angle, PWM transition angle, and energization end angle of each phase is made to correspond to the calculated rotation angle timing. Thus, the control contents (on command, off command) of the switching elements Sua to Swb in the energized phase are formed. (3) The carrier signal generator 11 divides the device clock (operation clock), for example, to generate a triangular wave (or sawtooth) signal Sc having a predetermined PWM carrier cycle (constant frequency, specifically, for example, 10 kHz) Tc. Form.

  The synchronous energization control unit 41b forms a PWM signal obtained by comparing the signal Sc of the carrier cycle Tc and the signal Sk of the target current Ik for each phase, and outputs the PWM signal of each phase from the output switching unit 41d to the drive control unit Output to 42.

  The asynchronous energization control unit 41c includes a data map 12 formed by a rewritable nonvolatile memory such as a RAM or a flash memory, and an input / output controller 13 (corresponding to the output control unit of the present invention) formed by a logic IC or the like. And an encoder (corresponding to the interrupt signal generating means of the present invention) 15 forming a comparator.

  In the data map 12, the energization start angle, the current rise angle, and the energization end angle of the energized phase calculated by the angle calculation unit 10 are written and read sequentially, and are calculated by the angle calculation unit 10 in association with them. The control contents (ON command, OFF command) of the switching elements Sua to Swb in the energized phase are also written and read sequentially.

  FIG. 3 shows the current change of the stator coils Lu, Lv, Lw in the energized phase of the SR motor 1 with rotation, the timing of the rotation angle read from the data map 12 corresponding to this current change (timing to detect), and the control contents (Next control content) change and actual control change example are shown, and θon, θk, θpwm, and θoff in the figure are timings of energization start angle, current rise angle, PWM transition angle, and energization end angle. The actual control “ON” is continuous ON control, “OFF” and “reflux OFF” are continuous OFF control, and “PWM” is PWM control. Further, the “reflux off” control is a control that keeps the current substantially constant by controlling only one of the switching elements Sua and Sub, taking the U-phase circuit of FIG. 1 as an example.

  The encoder 14 receives the energization start angle θon, the current rise angle θk, the PWM transition angle θpwm, and the energization end angle θoff of the energized phase sequentially read from the data map 12, and the rotational position of the position sensor 2 is the data map 12. When an energization start angle θon, a current rising angle θk, a PWM transition angle θpwm, and an energization end angle θoff are reached and matched, an interrupt signal Sint is sent to the input / output controller 13.

  In response to the input of the interrupt signal Sint, the input / output controller 13 receives each control content (specifically, a continuous ON control command signal Son during the current rising period at a timing coincident with the angle of the data map 12. In the energization end period, a continuous OFF control command signal Soff) is output to the output switching unit 41d.

  The command signals Son and Soff form a control command signal of the control content of the present invention. For example, when the command signals Son and Soff are each at a high level (hereinafter referred to as “High”), they are continuously turned on / off. This means a command, and a low level (hereinafter referred to as “Low”) means that there is no command. The command signals Son and Soff are generated for the number of phases of the SR motor 1. For example, when the SR motor 1 is a three-phase motor, three sets of command signals Son and Soff are generated.

  The output switching unit 41d forcibly gives priority to the PWM signal when the command signals Son and Soff are High with respect to the PWM signal of the synchronous energization control unit 41b and the command signals Son and Soff of the input / output controller 13. Thus, an on / off command is output to the drive control unit 42 in FIG. The configuration of the output switching unit 41d will be described more specifically. The output switching unit 41d includes, for example, a NOR gate to which a PWM signal and a command signal Son are input, and a NOR gate to which the output signal and the command signal Soff are input. The output is output to the drive control unit 42. When the command signals Son and Soff are High, the command signal Soff is output with priority.

  Then, according to the control of the drive control unit 42 based on the output signal of the output switching unit 41d, the energization phase switching elements Sua to Swb are turned on and off, and during the current rising period in which the command signal Son is output, The phase switching elements Sua to Swb are continuously kept on. For this reason, the energized phase stator coils Lu, Lv, and Lw rapidly rise to the target current Ik through the continuous flow of current without interruption during the energization start current rising period.

  When the current rising period ends and the current rising angle θk is reached, the masking of one of the on-control command signals Son (for example, the command signal Son of the switching elements Sua, Sva, and Swa) is released. Then, the period from the current rising angle θk to the PWM transition angle θpwm immediately after the release is set to end in synchronization with the carrier cycle Tc, and the inverter 3 is turned off to the inverter 3 via the output switching unit 41d. A command that keeps the current substantially constant is output. Further, at the timing of the PWM transition angle θpwm, the masking of the other (for example, the command signal Son of the switching elements Sub, Svb, Swb) is released, and the carrier is transferred from the synchronous energization control unit 41b to the inverter 3 via the output switching unit 41d. A normal PWM signal that changes to High / Low at the period Tc is output, and the switching elements Sua to Swb in the energized phase are turned on / off by PWM control of the carrier period by this PWM signal.

  Further, when the timing of the energization end angle θoff is reached and the I / O controller 13 outputs a low command signal Soff of the off control, the drive control unit 42 switches the energized phase switching elements Sua to Swb based on the command signal Soff. Is continuously turned off, and the current disappears quickly and the torque becomes zero.

  Therefore, in the case of this embodiment, the control timing and the control content of the SR motor 1 when the current of the stator coils Lu, Lv, Lw of the energized phase is raised and shifted to the PWM control are represented by the energization start angle θon and the current rise. The angle θk and the on-control are set, and at the time of starting energization at which at least the current of the stator coils Lu, Lv, and Lw in the energized phase of the SR motor 1 is raised to shift to PWM control, the detection angle (rotational position) of the position sensor 2 ) Is reached by the CPU of the calculation unit 41a and reaches the timing of the energization start angle θon stored in the data map 12, then the encoder 14 receives the interrupt signal Sint until the timing of the current rising angle θk is reached. Is generated.

  Then, based on the interrupt signal Sint, the input / output controller 13 outputs the on-control command signal Son stored in the data map 12 together with the control timing of the energization start angle θon without passing through the CPU ( (Hereinafter referred to as “DMA”) from the output switching unit 41d to the drive control unit 42 without delay, so that the energized phase switching elements Sua to Swb are continuously turned on without delay, and the currents of the energized phase stator coils Lu, Lv, Lw. Can be launched. At the end of energization, by setting the control timing and control content of the SR motor 1 when energization of the stator coils Lu, Lv, and Lw in the energized phase to the energization end angle θoff and off control, When the timing of the detection angle of the position sensor 2 reaches the timing of the energization end angle θoff, the OFF control command signal Soff is sent from the output switching unit 41d to the drive control unit 42 by DMA without passing through the CPU, and is delayed. The energized phase switching elements Sua to Swb can be continuously turned off, and energization of the energized phase can be quickly terminated.

  FIG. 4 schematically shows a process for starting energization by DMA and shifting to PWM control, and a process for starting current energization and shifting to PWM control by the CPU according to the present embodiment. .

  In the case of the DMA of this embodiment shown in FIG. 4A, when the energization start angle θon is reached, the command value stored in advance in the data map 12 is output to the output unit 41d without going through the CPU. Immediately after the turn-off control a1, a continuous turn-on control a2 of current rise is executed.

  On the other hand, in the case of an example via the CPU of FIG. 4B, when the energization start angle θon is reached, the CPU executes a memory saving process necessary for the interrupt process b2. Thereafter, a continuous ON control process b3 of current rise is executed, and the output is switched from the OFF control b1 to the ON control b5. Thereafter, the CPU performs the process b4 for calling the data saved in the memory and ends the interrupt process. In this case, as compared with the case of the DMA of the present embodiment, a delay of the time τα of the b2 occurs.

  In the case of another example via the CPU of FIG. 4 (c), since the process preferentially performed at the timing of the energization start angle θon has occurred, the process shown in FIG. The same save, execution, and data call processing c2 to c4 as the processing b2 to b4 of b) are executed. Thereafter, in order to carry out current rise control, PWM control data (PWM signal) and the like are again saved in the memory, c5 and continuous ON control c6 are executed, and the output is switched from OFF control c1 to ON control c8. . Further, the CPU calls the data (PWM signal) saved in the memory, and c7, the interrupt process is completed. In this case, as compared with the case of the present embodiment, the delay of the time τβ of c2 to c5 longer than the time τα occurs.

  As is clear from comparison between FIG. 4A, FIG. 4B, and FIG. 4C, in the case of the DMA control of this embodiment, there is no delay time τα, τβ, so the CPU required for switching the control Without waiting for the end of pre-processing such as memory saving and other high-priority processing, the current startup of the energized phase stator coils Lu, Lv, Lw and the subsequent shift to PWM control can be performed quickly without delay in timing. Therefore, it is possible to prevent a delay in energization control of the energization phase and increase the torque of the SR motor 1 at low cost, so that a shortage of torque does not occur even in a high rotation range.

(Second Embodiment)
A second embodiment will be described with reference to FIGS. 1, 2, and 5. FIG.

  In the case of this embodiment, the control of the reflux at the head of the PWM control is omitted to simplify the control.

  Therefore, the timing of the current rising angle θk in the configuration of FIG. 2 is not necessary, and the timing read from the data map 12 (detection timing) is the timing of the energization start angle θon, the PWM transition angle θpwm, and the energization end angle θoff. Become.

  Then, when the masking of the ON control command signal Son is released at the timing of the PWM transition angle θpwm, the synchronous energization control unit 41c immediately outputs a normal PWM signal that changes to High / Low in the carrier cycle Tc. The PWM signal causes the inverter 3 to turn on / off the energized phase switching elements Sua to Swb by PWM control of the carrier cycle.

  FIG. 5 shows current changes in the energized phase stator coils Lu, Lv, and Lw of this embodiment, timings read from the data map 12 corresponding to the current changes (detection timings), and control details (next control details). ) And a change example of actual control are shown and correspond to FIG.

  In the case of the present embodiment, as in the case of the first embodiment, at the time of starting energization at which the current of at least the energized phase stator coils Lu, Lv, and Lw of the SR motor 1 is raised to shift to PWM control, the encoder 14 On the basis of the interrupt signal Sint, the inverter 3 as the drive unit is controlled by DMA to continuously turn on the switching elements Sua to Swb in the energized phase, and the currents of the stator coils Lu, Lv, and Lw in the energized phase are raised. be able to. Further, when the timing of the detection angle of the position sensor 2 reaches the timing of the energization end angle θoff, the inverter 3 is controlled by DMA to continuously turn off the energized phase switching elements Sua to Swb, Can be energized. Further, when the timing of the PWM transition angle θpwm is reached, the DMA immediately shifts to the PWM control, so that the carrier synchronization control of the reflux can be omitted, and of course the effect of the first embodiment is achieved. There is an advantage that the processing can be simplified by reducing the processing of the energization control unit 41b.

(Third embodiment)
A third embodiment will be described with reference to FIG. 1, FIG. 6, and FIG.

  In the case of the present embodiment, for example, by adding a timer to the configuration of the first embodiment, the current rising period from the timing of the energization start angle θon is not set by the rotation angle (rotation position) of the SR motor 1. The current rise time Trise is set so as not to be affected by fluctuation (variation) in the rotational speed of the SR motor 1.

  FIG. 6 shows a detailed block configuration of the arithmetic processing unit 41 of FIG. 1 in the case of the present embodiment. In the case of the present embodiment, the asynchronous energization control unit 41c schematically adds a timer 15 to the configuration of FIG. An output signal of the current rise time Trise of the timer 15 is provided to the input / output controller 13 as an interrupt signal.

  The timer 15 then rotates the SR motor 1 from the energization start angle θon to the current rise angle θk based on the energization start angle θon, the current rise angle θk, and the rotation speed ω of the SR motor 1 in the data map 12. The required time is obtained in advance as the current rise time Trise, and when the energization start angle θon is reached, the current rise time Trise is counted from this timing, and during that time, the current rise time Trise is reached instead of the interrupt signal Sint. An interrupt signal notifying that it has been output is output to the input / output controller 13.

  In the present embodiment, the encoder 14 is prohibited from outputting the interrupt signal Sint between the energization start angle θon and the current rise angle θk.

  In the input / output controller 13, the current rising period from the timing of the energization start angle θon is not set from the rotation angle of the SR motor 1 based on the detection of the current rising angle θk of the SR motor 1. It is set by the count of the current rising time Trise of the timer 15.

  FIG. 7 shows current changes in the energized phase stator coils Lu, Lv, and Lw of the SR motor 1 as in FIG. 3, timings read from the data map 12 corresponding to these current changes, examples of changes in control contents, An example of control time change and a control example of the current rise time Trise by the timer 15 are shown, and the current rise from the energization start angle θon is stabilized by time management by the control of the current rise time Trise by the timer 15. It is done.

  Therefore, in the case of the present embodiment, the current rise period from the timing of the energization start angle θon is set by the current rise time Trise, so that the current of the stator coils Lu, Lv, Lw in the energized phase can be further increased. There is also an advantage that it is not affected by fluctuation (variation) in the rotational speed of the SR motor 1.

(Fourth embodiment)
A fourth embodiment will be described with reference to FIGS. 1, 2, and 8. FIG.

  In the case of this embodiment, in the configuration of the second embodiment, when the SR motor 1 in FIG. 1 rotates in a high rotation range, the control of the arithmetic processing unit 41 in FIG. 2 is changed to further reduce the burden on the CPU. Plan.

  That is, when the SR motor 1 rotates in the high rotation range, the switching elements Sua to Swb in the energized phase are actually continuously controlled to be on during the PWM control.

  Therefore, when the SR motor 1 is in a high rotational speed range of a certain speed or higher, the timing (detection timing) read from the data map 12 of the asynchronous energization control unit 41c in FIG. 5 is the energization start angle θon and the energization end angle θoff. Change only to the timing.

  FIG. 8 shows current changes in the energized phase stator coils Lu, Lv, and Lw of this embodiment, timings to be read from the data map 12 corresponding to the current changes (detection timings), and control contents (next control contents). ) Of time change and an example of actual control change.

  As can be seen from FIG. 8, after the DMA is continuously turned on by the command signal Son of the turn-on control from the timing of the energization start angle θon, the period is switched to PWM control at the timing of the current rising angle θk. In this case, the on-control command signal Son is maintained, and the energized phase switching elements Sua to Swb are continuously turned on by DMA. Then, when the timing of the energization end angle θoff is reached, the DMA shifts to continuous off control by the off control command signal Soff instead of the command signal Son.

  On the other hand, when the SR motor 1 is in a high rotational speed range of a certain speed or higher, processing such as the formation of the PWM signal of the synchronous energization control unit 41b in FIG. 2 is stopped, and the burden on the CPU is reduced.

  Therefore, in the case of the present embodiment, in the high rotation region of the SR motor 1 in which the current-induced voltage increases and the switching elements Sua to Swb of the energized phase are continuously controlled during PWM control, the energized phase The control timing and control content of the SR motor 1 when the current of the stator coils Lu, Lv, and Lw is raised and shifted to PWM control are set to the energization start angle θon and on control, and the energized phase stator coils Lu, The control timing and control content of the SR motor 1 at the end of energization of Lv and Lw are set to energization end angle θoff and off control, and energization is performed based on two setting parameters of energization start angle θon and energization end angle θoff. By controlling the currents of the phase stator coils Lu, Lv, and Lw by DMA, there is an advantage that the load on the CPU can be greatly reduced.

  The present invention is not limited to the above-described embodiments, and various modifications other than those described above can be made without departing from the spirit thereof. For example, the inverter 3 and the control unit 4 Each configuration and the like may be different from the above-described embodiment.

  Also, when the SR motor 1 is a multi-phase of four or more phases, the number of arms of the inverter 3 and the number of switching elements are only increased compared to the case of three phases, and the present invention can be similarly applied.

  Furthermore, the present invention can be similarly applied to, for example, a motor driving device of an axial gap SR motor.

  Further, the rotational position of the SR motor 1 is not limited to being detected by the position sensor, but may be detected by various motor rotational position estimation methods.

  The present invention can be applied not only to drive motors for electric vehicles and hybrid vehicles, but also to motor drive devices for motors for various purposes.

DESCRIPTION OF SYMBOLS 1 SR motor 2 Position sensor 3 Inverter 4 Control part 12 Data map 13 Input / output controller 14 Encoder 41a Operation part 41b Synchronous energization control part 41c Asynchronous energization control part 42 Drive control part Lu-Lw Stator coil Sua-Swa, Sub-Swb switching element

Claims (1)

A motor drive control device that controls energization of a coil in an energized phase of a switched reluctance motor to be controlled by PWM control of a drive unit synchronized with a carrier cycle,
Arithmetic processing means for calculating a control timing and control content determined by the rotational position of the switched reluctance motor when at least raising the current of the coil of the energized phase and shifting to PWM control;
Storage means for storing the control timing and the control content;
Detecting means for detecting a rotational position of the switched reluctance motor;
An interrupt signal generating means for generating an interrupt signal when the detection position of the detection means reaches the position of the control timing;
A control output means for controlling the drive section by direct memory access by sending a control command signal of the control content of the storage means to the drive control section of the drive section without passing through the CPU in response to the input of the interrupt signal; A motor drive control device comprising:

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