ENGINE DRIVE DEVICE AND ENGINE DRIVE SYSTEM

Abstract

A motor drive device (9) comprises an inverter part (10) in which a plurality of switch arms (11, 12, 13) are connected in parallel, a diode part (20) comprising for each of the switch arms (11, 12, 13) a pair of diodes (21, 22, 23) which includes a first diode (211, 221, 231) and a second diode (212, 222, 232), and a switching control (30) which controls the voltage to be applied to the gates of the first switching elements (111, 121, 131) and second switching elements (112, 122, 132) contained in the inverter part (10).

Description

Technical field

[0001] The present disclosure relates to a motor drive device and a motor drive system. State of the art

[0002] A conventional motor device converts direct current to alternating current by using an inverter in which three sets of switch groups are connected in parallel, each switch group comprising a first switch whose source is connected to a power supply, a second switch whose drain is grounded, and a diode provided between a drain of the first switch and a source of the second switch, thereby driving a switched reluctance motor (for example, JP 2023-79746 A). Brief description of the invention; problem to be solved by the invention

[0003] The circuit configuration of a conventional inverter differs from that of a mass-produced inverter designed to drive a general-purpose motor, such as a three-phase motor (a so-called general-purpose inverter). Therefore, it is necessary to design a new inverter. This involves increasing the capacity of a component like the switch that forms the inverter, according to the power rating of the switched reluctance motor, and designing a protective circuit to prevent the inverter from overcurrenting. Consequently, the inverter cannot simply be built using a standard design.

[0004] The present disclosure focuses on this point, and one of its aims is to drive a switched reluctance motor using a general-purpose inverter. Means to solve the problem

[0005] A first aspect of the present disclosure provides a motor drive device for driving a switched reluctance motor, wherein the switched reluctance motor comprises i) a rotor rotatably arranged about a rotating shaft and having a plurality of prominent poles formed on its outer circumference, and ii) a stator arranged around the outside of the rotor and having a plurality of tooth sections formed on its inner circumference, wherein a winding of one phase is wound under windings of a plurality of phases around each of the plurality of tooth sections, and the windings of the plurality of phases are connected in series in a ring configuration, wherein the motor drive device comprises an inverter part, which consists of a first switching element, the source of which is connected to a power supply, and a second switching element, the drain of which is connected to a ground, and a plurality of switch arms.which connect a drain of the first switching element and a source of the second switching element, are connected in parallel, a diode section comprising a pair of diodes for each of the switching arms, wherein the pair of diodes comprises i) a first diode whose anode is connected to a connection point between a drain of the first switching element and a source of the second switching element, and a second diode whose cathode is connected to the connection point, and ii) a) a cathode of the first diode is connected to a first connection that connects two adjacent windings in series, and b) an anode of the second diode is connected to a second connection that connects two adjacent windings in series and is different from the first connection, and a switching control that controls the voltage to be applied to the gates of the first and second switching elements contained in the inverter section.

[0006] The switched reluctance motor can be provided with a plurality of connections that connect two adjacent windings in series, and the anodes of the plurality of first diodes and the cathodes of the plurality of second diodes contained in the diode section can each be connected to the different connections.

[0007] The inverter section can include a first switch arm, a second switch arm, and a third switch arm connected in parallel.

[0008] The windings of the multitude of phases can include windings of phase A, phase B, phase C, phase D, phase E and phase F, which are connected in series in a ring shape, and the difference in electrical angle between each of the phase A and phase F, phase F and phase E, phase E and phase D, phase D and phase C, phase C and phase B and phase A can be 60 degrees, and the cathode of the first diode, which is connected to the first switch arm, can be connected to a connection that connects the winding of phase A and the winding of phase F in series, and the anode of the second diode, which is connected to the first switch arm, can be connected to a connection that connects the winding of phase D and the winding of phase C in series.

[0009] The cathode of the first diode, which is connected to the second switch arm, can be connected to a connection that connects the winding of phase E and the winding of phase D in series, and the anode of the second diode, which is connected to the second switch arm, can be connected to a connection that connects the winding of phase B and the winding of phase A in series.

[0010] The cathode of the first diode, which is connected to the third switch arm, can be connected to a connection that connects the winding of phase C and the winding of phase B in series, and the anode of the second diode, which is connected to the third switch arm, can be connected to a connection that connects the winding of phase F and the winding of phase E in series.

[0011] The switching control can start and stop the application of voltage, so that the difference in electrical angle between each of the first switching element of the first switch arm and the second switching element of the second switch arm, the second switching element and the first switching element of the third switch arm, the first switching element and the second switching element of the first switch arm, the second switching element and the first switching element of the second switch arm, the first switching element and the second switching element of the third switch arm, and the second switching element and the first switching element of the first switch arm is 60 degrees.

[0012] The switching control can apply voltage to the gates of the multitude of first switching elements and the multitude of second switching elements contained in the inverter section, thereby supplying an offset current, which is a DC current superimposed on the AC current, to the diode section.

[0013] The switching control can include an application part that calculates an electrical angle corresponding to a mechanical angle of the switched reluctance motor detected in a predetermined cycle, and identifies the gate to which voltage is to be applied at the calculated electrical angle, among the gates of the plurality of first switching elements and the gates of the plurality of second switching elements.

[0014] The switching control can further include an identification part that detects a torque corresponding to the degree of actuation of an accelerator pedal and identifies a frequency of the current to be output in order to rotate the rotor of the switched reluctance motor at a speed corresponding to the torque, and the application part can perform chopper control by repeatedly starting and stopping the application of voltage to the identified gate and causes the inverter part to output current at a frequency identified by the identification part.

[0015] A second aspect of the present disclosure provides a motor drive system comprising a motor and a motor drive device, wherein the motor is a switched reluctance motor comprising i) a rotor rotatably arranged about a rotating shaft and having a plurality of prominent poles formed on its outer circumference, and ii) a stator arranged around the outside of the rotor and having a plurality of tooth sections formed on its inner circumference, wherein a winding of one phase is wound under windings of a plurality of phases around each of the plurality of tooth sections, the motor drive device comprising an inverter part comprising a first switching element whose source is connected to a power supply and a second switching element whose drain is connected to a ground, and a plurality of switch arms.which connect a drain of the first switching element and a source of the second switching element, are connected in parallel, a diode section comprising a pair of diodes for each of the switching arms, wherein the pair of diodes comprises i) a first diode whose anode is connected to a connection between a drain of the first switching element and a source of the second switching element, and a second diode whose cathode is connected to the connection, and ii) a) a cathode of the first diode is connected to a first connection in which two adjacent windings are connected in series, and b) an anode of the second diode is connected to a second connection in which two adjacent windings, different from the first connection, are connected in series, and a switching control comprising a switching control that controls the voltage to be applied to the gates of the first and second switching elements contained in the inverter section.

[0016] The windings of the multitude of phases can include windings of phase A, phase B, phase C, phase D, phase E and phase F, and the difference in electrical angle between each of phase A and phase F, phase F and phase E, phase E and phase D, phase D and phase C, phase C and phase B and phase B and phase A can be 60 degrees, and the windings of phase A, phase B, phase C, phase D, phase E and phase F can be connected in series in this order in a ring form.

[0017] The windings of the multitude of phases can include windings of phase A, phase B, phase C, phase D, phase E and phase F, and the difference in electrical angle between each of phase A and phase F, phase F and phase E, phase E and phase D, phase D and phase C, phase C and phase B and phase B and phase A can be 60 degrees, and the windings of phase A, phase B, phase C, phase D, phase E and phase F can be connected at one end to a neutral point. Effect of the invention

[0018] According to the present disclosure, it is possible to achieve an effect of driving a switched reluctance motor using a general-purpose inverter. Brief description of the drawings Fig. Figure 1 shows an overview of a circuit configuration of a motor drive system 1. Fig. Figure 2 shows an overview of the structure of an engine. Fig. Figure 3 shows a configuration of a switching control 30. Fig. Figure 4 shows a calculated electrical angle and switch for implementing chopper control. Fig. Figure 5 shows a circuit configuration of the motor drive system 1 according to a second modified example. Description of embodiments<Overview of the motor drive system 1>

[0019] Fig. Figure 1 shows an overview of a circuit configuration of a motor drive system 1. The in Fig. The motor drive system 1 shown comprises a motor 2 and a motor drive device 9. The motor drive system 1 has the function of receiving electricity and outputting mechanical energy according to a user requirement. As an example, if the motor drive system 1 is installed in a vehicle, the user is a driver of the vehicle, and the motor drive system 1 is a system that outputs mechanical energy corresponding to the amount the driver applies to an accelerator pedal.

[0020] For example, a motor 2 is a switched reluctance motor (SRM), which is an electric motor that outputs mechanical energy by rotating a rotor consisting of a ferromagnetic iron core, using a magnetic field generated around a coil wound around a stator. Fig. Figure 2 shows an overview of the structure of engine 2. Fig. Figure 2 is a cross-sectional view along a plane perpendicular to the axial direction of a rotating shaft of the motor 2. The motor 2 comprises a rotating shaft 3, a rotor 4 and a stator 6.

[0021] The rotor 4 is a rotor arranged so that it is rotatable about the rotating shaft 3 and has a plurality of pronounced poles 5 (ten pronounced poles 5 in Fig. 2) exhibits, which are formed on its outer circumference. The pronounced poles 5 formed on the outer circumference of the rotor 4 consist of a ferromagnetic material. It should be noted that in Fig. 2 one of the many distinct poles 5 is exemplified with a reference sign.

[0022] The stator 6 is a stator arranged around the outside of the rotor 4 and has a plurality of tooth sections 7 formed on its inner circumference. Each of the plurality of tooth sections 7 has a winding of one phase from the plurality of phase windings (coils) wound around it. The plurality of phases includes, for example, six phases: Phase A, Phase B, Phase C, Phase D, Phase E, and Phase F. Fig. Figure 2 is an example of one of the multiple tooth sections 7, each designated with a reference numeral. This tooth section 7 has a partial winding 8a, consisting of a partial winding 8a and a partial winding 8b, which together form the winding of phase A. The partial windings 8a and 8b are connected in series. The windings of the phases other than phase A among the multiple phase windings also have the same configuration as the winding of phase A.

[0023] Returning to Fig. 1. The windings of the multiple phases of the motor comprise 2. Windings of phase A, phase B, phase C, phase D, phase E, and phase F, positioned counterclockwise, and the windings of phase A, phase B, phase C, phase D, phase E, and phase F are connected in series in this order in a ring configuration. Therefore, motor 2 is provided with a multiple of connections that connect two adjacent windings in series, such as connection AF, connection FE, connection ED, connection DC, connection CB, and connection BA. It should be noted that the difference in electrical angle between each of phase A and phase F, phase F and phase E, phase E and phase D, phase D and phase C, phase C and phase B, and phase B and phase A is 60 degrees.

[0024] The motor drive device 9 is a device for driving the motor 2 (SRM) and is a so-called inverter. The motor drive device 9 receives current and performs chopper control, such as pulse width modulation (PWM) control, to output current at a frequency corresponding to the speed required for the motor 2.

[0025] A three-phase induction motor (a so-called general-purpose motor) can be driven by connecting it to an inverter (a so-called general-purpose inverter) consisting of three parallel-connected switching arms, each with two series-connected switching elements. However, the inverter for driving motor 2 (SRM) differs from a general-purpose inverter, so it is necessary to determine the size of the component that forms the inverter and to design a protective circuit to prevent the inverter from outputting an overcurrent.

[0026] Accordingly, a bidirectional diode is connected downstream of the general-purpose inverter in the motor drive device 9, and current is supplied from the bidirectional diode to the motor 2. With this configuration, the motor drive device 9 can split each phase of the three-phase general-purpose inverter, which consists of three switch arms connected in parallel, into a current-supplying phase and a current-drawing phase, thus enabling the general-purpose inverter to be used as a six-phase inverter. Furthermore, the motor drive device 9 can drive the motor 2 (SRM) by controlling a switch contained in the general-purpose inverter based on the electrical angle, which corresponds to the mechanical angle of the motor 2. <Konfiguration der Motorantriebsvorrichtung 9>

[0027] As in Fig. As shown in Figure 1, the motor drive device 9 comprises an inverter part 10, a diode part 20 and a switching control 30.

[0028] Inverter section 10 is a so-called general-purpose inverter and has a configuration in which a large number of switch arms are connected in parallel. The one in Fig. 1 The inverter part 10 shown comprises as switch arms a U-phase arm 11 (first switch arm), a V-phase arm 12 (second switch arm) and a W-phase arm 13 (third switch arm) which are connected in parallel.

[0029] The switch arm consists of an upper switch (first switching element) whose source is connected to a power supply, and a lower switch (second switching element) whose drain is connected to ground, and the drain of the upper switch and the source of the lower switch are connected. Fig. 1 are an upper switch 111 and a lower switch 112 contained in the U-phase arm 11, an upper switch 121 and a lower switch 122 contained in the V-phase arm 12, and an upper switch 131 and a lower switch 132 contained in the W-phase arm 13, connected to each other.

[0030] It should be noted that in the following description, the upper switch 111 is referred to as the A-phase switch 111, the upper switch 121 as the E-phase switch 121, the upper switch 131 as the C-phase switch 131, the lower switch 112 as the D-phase switch 112, the lower switch 122 as the B-phase switch 122, and the lower switch 132 as the F-phase switch 132. Furthermore, in the following description, at least one of the A-phase switches 111, the E-phase switch 121, or the C-phase switch 131 is referred to as the "upper switch," and at least one of the D-phase switches 112, the B-phase switch 122, or the F-phase switch 132 is referred to as the "lower switch."

[0031] The diode section 20 is a circuit for feeding the output of the inverter section 10 into the motor 2 and has a bidirectional diode (a pair of diodes) for each switch arm. In particular, the circuit comprises Fig. 1 Diode section 20 shown a bidirectional diode 21 connected downstream of the U-phase arm 11, a bidirectional diode 22 connected downstream of the V-phase arm 12, and a bidirectional diode 23 connected downstream of the W-phase arm 13.

[0032] Each bidirectional diode comprises a first diode whose anode is connected to a junction between the drain of the upper switch and the source of the lower switch, and a second diode whose cathode is connected to this junction. In the bidirectional diode, the cathode of the first diode is connected to a first junction that connects two adjacent windings in series, and the anode of the second diode is connected to a second junction, distinct from the first, that also connects two adjacent windings in series. Furthermore, the anodes of the plurality of first diodes and the cathodes of the plurality of second diodes contained in diode part 20 are each connected to different junctions.

[0033] In particular, the bidirectional diode 21 comprises a first diode 211, whose anode is connected to a connection point between the drain of the A-phase switch 111 and the source of the D-phase switch 112, and a second diode 212, whose cathode is connected to this connection point. The cathode of the first diode 211 is connected to a first connection (connection AF), which connects two adjacent windings (the A-phase winding and the F-phase winding) in series. The anode of the second diode 212 is connected to a second connection (connection DC), which differs from connection AF and connects two adjacent windings (the D-phase winding and the C-phase winding) in series.

[0034] The bidirectional diode 22 comprises a first diode 221, whose anode is connected to a connection point between the drain of the E-phase switch 121 and the source of the B-phase switch 122, and a second diode 222, whose cathode is connected to this connection point. The cathode of the first diode 221 is connected to the connection ED, which connects the E-phase winding and the D-phase winding in series, and the anode of the second diode 222 is connected to the connection BA, which connects the B-phase winding and the A-phase winding in series.

[0035] The bidirectional diode 23 comprises a first diode 231, whose anode is connected to a connection point between the drain of the C-phase switch 131 and the source of the F-phase switch 132, and a second diode 232, whose cathode is connected to this connection point. The cathode of the first diode 231 is connected to the connection CB, which connects the winding of the C-phase and the winding of the B-phase in series, and the anode of the second diode 232 is connected to the connection FE, which connects the winding of the F-phase and the winding of the E-phase in series.

[0036] With the diode section 20 configured as described above, the diode section 20 can split each of the three phases of the inverter section 10 into one phase that supplies current to motor 2 and one phase that draws current from motor 2. Furthermore, in the motor drive device 9, the inverter section 10, which has the same configuration as the three-phase general-purpose inverter, can be used as a six-phase inverter by connecting the diode section 2 downstream of the inverter section 10. As a result, in the motor drive device 9, motor 2 (SRM) can be driven using a general-purpose inverter.

[0037] The switching control 30 controls the current output by the motor drive device 9 to the motor 2 by controlling the voltage to be applied to the gates of the upper switches and lower switches in the inverter part 10. Fig. Figure 3 shows a configuration of the switching controller 30. The switching controller 30 includes a memory 31 and a processor 32.

[0038] Memory 31 comprises a storage medium such as read-only memory (ROM), random access memory (RAM), a hard disk drive (HDD), or a solid-state drive (SSD), for example. Memory 31 stores a program executed by processor 32 and various types of information for driving motor 2.

[0039] Processor 32 is a processor such as a central processing unit (CPU) or an electronic control unit (ECU). Processor 32 functions as an identification part 321 and an application part 322 by executing the program stored in memory 31. It should be noted that processor 32 can be configured as a single processor, as multiple processors, or as a combination of one or more processors and an electronic circuit.

[0040] The identification part 321 detects a requested torque from an external ECU. The requested torque is, for example, the amount of torque corresponding to the amount the driver applies to the accelerator pedal of the vehicle equipped with the motor drive system 1. The identification part 321 identifies the rotational speed of motor 2 corresponding to the requested torque, for example, by accessing memory 31. Then, the identification part 321 identifies the frequency of the current output by the motor drive device 9 corresponding to the identified rotational speed of motor 2, again by accessing memory 31. That is, the identification part 321 detects the torque corresponding to the amount of acceleration applied to the accelerator pedal and identifies the frequency of the current output to rotate the rotor of motor 2 at the speed corresponding to the torque.

[0041] The application unit 322 controls the voltage to be applied to at least one of the gates of the plurality of upper and lower switches in the inverter unit 10. The application unit 322 detects the mechanical angle of the motor 2, which is measured by a rotary angle sensor (a so-called resolver, not shown in the figures) contained in the motor 2, at a predetermined cycle, for example. The application unit 322 calculates an electrical angle corresponding to the measured mechanical angle and identifies a gate (switch) to which voltage is to be applied at the calculated electrical angle.That is, the application element 322 calculates the electrical angle corresponding to the mechanical angle of motor 2 detected in a predetermined cycle and identifies the gate to which voltage is to be applied at the calculated electrical angle from the gates of the plurality of first switching elements and the gates of the plurality of second switching elements. The application element 322 performs the chopper control by repeatedly starting and stopping the application of voltage to the identified gate and causes the inverter element 10 to output current at the frequency identified by the identification element 321.

[0042] Fig. Figure 4 shows the calculated electrical angle and the switches for implementing the chopper control. The horizontal axis in Fig. 4 indicates the electric angle, and the vertical axis in Fig. 4 indicates each switch contained in the inverter section 10. The one on the vertical axis of Fig. Figure 4, labeled “A”, represents a state in which chopper control is performed by repeatedly starting and stopping the application of voltage to the switch (gate), while the “S” shown on the vertical axis represents a state in which no application to the switch occurs (i.e., chopper control is not performed). For example, if the electrical angle calculated by the application part 322 is 60 degrees, the application part 322 continues to start and stop the application of voltage to the gates of the A-phase switch 111 and the B-phase switch 122 (the chopper control) and does not perform chopper control at the D-phase switch 112 and the E-phase switch 121. Furthermore, the connecting part 322 stops the chopper control at the C-phase switch 131 and starts the chopper control at the F-phase switch 132.

[0043] As in Fig. As shown in Figure 4, the switching control 30 starts and stops the application of voltage, so that the difference in electrical angle between each of the A-phase switch 111 and the B-phase switch 122, the B-phase switch 122 and the C-phase switch 131, the C-phase switch 131 and the D-phase switch 112, the D-phase switch 112 and the E-phase switch 121, the E-phase switch 121 and the F-phase switch 132 and the F-phase switch 132 and the A-phase switch 111 is 60 degrees. For example, the switching control 30 starts applying voltage to the A-phase switch 111 at an electrical angle of 0 degrees and then starts applying voltage to the F-phase switch 132 at an electrical angle of 60 degrees.After the application of voltage to the A-phase switch 111 stops at an electrical angle of 180 degrees, the switching control 30 stops the application of voltage to the F-phase switch 132 at an electrical angle of 240 degrees.

[0044] Furthermore, the switching control 30 applies voltage to the gates of the plurality of upper and lower switches contained in the inverter section 10, thereby supplying an offset current, which is a DC current superimposed on the AC current, to the diode section 2. The torque of the motor 2 varies according to the AC-to-DC ratio flowing through the motor 2. Accordingly, the motor drive system 1, through the operation described above, can supply an offset current with an AC-to-DC ratio that increases the torque of the motor 2. It should be noted that each offset current supplied to the motor 2 flows through either the first diode or the second diode of the diode section 20, so that the AC current is not a sine wave but a half-wave. Consequently, each offset current contains only a DC component during periods when no AC component is present.

[0045] Here, the offset current flowing from the motor drive device 9 to the motor 2 (hereinafter referred to as "line current") and the coil current flowing through each winding of the motor 2 are described in detail.

[0046] As in Fig. As shown in section 4, the line currents i a , i b , i c , i d , i e and i f , which in Fig. The equations shown in Figure 1 are given by equations (1) to (6) when the switching controller 30 controls each gate. dc represents a direct current component, and l ac represents an alternating current component. [Formula 1] ia=Idc2+13Iac sin(θ+π6) ib=−Idc2+13Iac sin(θ+3π2) ic=Idc2+13Iac sin(θ+5π6) id=−Idc2+13Iac sin(θ+π6) ie=Idc2+13Iac sin(θ+3π2) if=−Idc2+13Iac sin(θ+5π6)

[0047] Furthermore, the coil currents can be determined using Kirchhoff's law. a , i b , i c , i d , i e and i f , which in Fig. 1 are shown, which are expressed by equations (7) to (12). [Formula 2] ia=Ia+if ib=Ib+ia ic=Ic+ib ie=Ie+id ie=Ie+id ia+ib+ic+id+ie+if=0

[0048] Then, based on the equations (1) to (12) above, the coil currents i can be determined. a , i b , i c , i a , i e and i f can be expressed by equations (13) to (18). [Formula 3] ia=Idc2+13Iacsin(θ+π6) ib=−Idc2+13Iacsin(θ+3π2) ic=Idc2+13Iacsin(θ+5π6) id=−Idc2+13Iacsin(θ+π6) ie=Idc2+13Iacsin(θ+3π2) if=−Idc2+13Iacsin(θ+5π6)

[0049] As shown in equations (1) to (6) and equations (13) to (18), each coil current flows at an electrical angle leading by 30 degrees relative to each line current. Since each line current forms a six-phase alternating current, the motor drive device 9 can drive the motor 2, which is a six-phase SRM.

[0050] The line current and the coil current have been described in detail above. <Erstes modifiziertes Beispiel>

[0051] The above description has illustrated, by way of example, the operation of the motor drive device 9 for driving the motor 2 (a so-called 12 / 10 SRM), which comprises the rotor 4 with ten prominent poles 5 formed on its outer circumference and the stator 6 with twelve toothed sections 7 formed on its inner circumference, but is not limited to this. The motor drive device 9 can also drive the motor 2 (a so-called 12 / 8 SRM), which comprises the rotor 4 with eight prominent poles 5 formed on its outer circumference and the stator 6 with twelve toothed sections 7 formed on its inner circumference, by the same operation as described above. <Zweites modifiziertes Beispiel>

[0052] The above description has illustrated the operation of motor 2 as an example, in which the windings of phase A, phase B, phase C, phase D, phase E, and phase F are connected in series in that order in a ring configuration, but it is not limited to this. The windings of phase A, phase B, phase C, phase D, phase E, and phase F can be connected at one end to a neutral point. Fig. Figure 5 shows a circuit configuration of the motor drive system 1 according to a second modified example. The one in Fig. The motor drive system 1 shown in Figure 5 differs from the one in Figure 5. Fig. The motor drive system shown in Figure 1 differs in that the windings of phase A, phase B, phase C, phase D, phase E and phase F are connected at one end to a neutral point P, and is the same in other aspects. <Wirkungen der Motorantriebsvorrichtung 9>

[0053] As described above, the motor drive device 9 comprises i) the inverter section 10, in which switch arms formed by connecting the upper switch and the lower switch are connected in parallel, and ii) the diode section 20, which has a pair of diodes for each switch arm. The pair of diodes comprises the first diode, whose anode is connected to a connection point between the upper switch and the lower switch, and the second diode, whose cathode is connected to this connection point. The cathode of the first diode and the anode of the second diode are connected by a link that connects two adjacent windings of the motor 2 in series.The switching control 30 contained in the motor drive device 9 controls the voltage to be applied to the upper switch and the lower switch, so that the motor drive device 9 drives the motor 2, which is an SRM comprising the rotor 4 with the plurality of prominent poles 5 formed on its outer circumference and the stator 6 with the plurality of tooth sections 7 formed on its inner circumference, wherein the windings wound around the plurality of tooth sections 7 are connected in series in a ring form.

[0054] With the motor drive device 9 configured in this way, the motor drive device 9 can drive the motor 2 serving as the SRM by using the inverter part 10, which has the same configuration as an inverter (general-purpose inverter) for driving a general-purpose motor such as a three-phase motor. As a result, an inverter for driving the SRM can be easily formed.

[0055] The present disclosure is explained on the basis of the exemplary embodiments. The technical scope of protection of the present disclosure is not limited to the scope explained in the embodiments above, and it is possible to make various changes and modifications within the scope of the disclosure. For example, the entire device or a part thereof can be configured with any unit that is functionally or physically distributed or integrated. Furthermore, new exemplary embodiments generated by any combination thereof are included in the exemplary embodiments of the present disclosure. Moreover, the effects of the new exemplary embodiments produced by the combinations also have the effects of the original exemplary embodiments. [Description of reference symbols] 1 Motor drive system 2 Engine 3. Rotary shaft 4 Rotor 5 pronounced pole 6 Stator 7th tooth section 8a Partial winding 8b Partial winding 9 Motor drive device 10 Inverter section 11 U-phase arm 12 V-phase arm 13 W-phase arm 111 A-phase switch 112 D-phase switches 121 E-phase switches 122 B-phase switches 131 C-phase switch 132 F-phase switch 20 diode section 21 bidirectional diode 22 bidirectional diode 23 bidirectional diode 211 first diode 212 second diode 221 first diode 222 second diode 231 first diode 232 second diode 30 Switch control 31 storage 32 processor 321 Identification part 322 Attachment part QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2023

[0002] JP 79746 A

[0002]

Claims

[1] Motor drive device (9) for driving a switched reluctance motor (2), wherein the switched reluctance motor (2) comprises i) a rotor (4) rotatably arranged about a rotating shaft (3) and having a plurality of prominent poles (5) formed on its outer circumference, and ii) a stator (6) arranged around the outside of the rotor (4) and having a plurality of tooth sections (7) formed on its inner circumference, wherein a winding of one phase is wound under windings of a plurality of phases around each of the plurality of tooth sections (7) and the windings of the plurality of phases are connected in series in a ring shape, wherein the motor drive device (9) comprises: an inverter part (10) comprising a first switching element (111, 121, 131) whose source is connected to a power supply and a second switching element (112, 122, 132) whose drain is connected to a ground, and a plurality of switching arms (11, 12, 13) connected in parallel to a drain of the first switching element (111, 121, 131) and a source of the second switching element (112, 122, 132); a diode section (20) comprising a pair of diodes (21, 22, 23) for each of the switch arms (11, 12, 13), wherein the pair of diodes (21, 22, 23) comprises i) a first diode (211, 221, 231) whose anode is connected to a connection point between a drain of the first switching element and a source of the second switching element, and a second diode (212, 222, 232) whose cathode is connected to the connection point, and ii) a) a cathode of the first diode (211, 221, 231) is connected to a first connection that connects two adjacent windings in series, and b) an anode of the second diode (212, 222, 232) is connected to a second connection that connects two adjacent windings in series and is different from the first connection; and a switching control (30) which controls the voltage to be applied to the gates of the first switching elements (111, 121, 131) and second switching elements (112, 122, 132) contained in the inverter part (10). [2] Motor drive device (9) according to claim 1, wherein the switched reluctance motor (2) is provided with a plurality of connections that connect two adjacent windings in series, and the anodes of the plurality of first diodes (211, 221, 231) and the cathodes of the plurality of second diodes (212, 222, 232) contained in the diode part (20) are each connected to the different connections. [3] Motor drive device (9) according to claim 1 or 2, wherein the inverter part (10) comprises a first switch arm (11), a second switch arm (12) and a third switch arm (13) connected in parallel. [4] Motor drive device (9) according to claim 3, wherein the windings of the multitude of phases comprise windings of phase A, phase B, phase C, phase D, phase E and phase F, which are connected in series in a ring shape, and the difference in electrical angle between each of phase A and phase F, phase F and phase E, phase E and phase D, phase D and phase C, phase C and phase B and phase A is 60 degrees, and the cathode of the first diode (211), which is connected to the first switch arm (11), is connected to a connection that connects the winding of phase A and the winding of phase F in series, and the anode of the second diode (212), which is connected to the first switch arm (11), is connected to a connection that connects the winding of phase D and the winding of phase C in series. [5] Motor drive device (9) according to claim 4, wherein the cathode of the first diode (221) connected to the second switch arm (12) is connected to a connection that connects the winding of phase E and the winding of phase D in series, and the anode of the second diode (222) connected to the second switch arm (12) is connected to a connection that connects the winding of phase B and the winding of phase A in series. [6] Motor drive device (9) according to claim 4 or 5, wherein the cathode of the first diode (231) connected to the third switch arm (13) is connected to a connection that connects the winding of phase C and the winding of phase B in series, and the anode of the second diode (232) connected to the third switch arm (13) is connected to a connection that connects the winding of phase F and the winding of phase E in series. [7] Motor drive device (9) according to one of claims 3 to 6, wherein the switching control (30) starts and stops the application of voltage, such that the difference in electrical angle between each of the first switching element (111) of the first switch arm (11) and the second switching element (122) of the second switch arm (12), the second switching element (122) and the first switching element (131) of the third switch arm (13), the first switching element (131) and the second switching element (112) of the first switch arm (11), the second switching element (112) and the first switching element (121) of the second switch arm (12), the first switching element (121) and the second switching element (132) of the third switch arm (13) and the second switching element (132) and the first switching element (111) of the first switch arm (11) is 60 degrees. [8] Motor drive device (9) according to one of claims 1 to 7, wherein the switching control (30) applies voltage to the gates of the plurality of first switching elements (111, 121, 131) and the plurality of second switching elements (112, 122, 132) contained in the inverter part (10), thereby supplying an offset current, which is a direct current superimposed on the alternating current, to the diode part (20). [9] Motor drive device (9) according to one of claims 1 to 8, wherein the switching control (30) comprises an application part (322) which calculates an electrical angle corresponding to a mechanical angle of the switched reluctance motor (2) detected in a predetermined cycle, and identifies the gate to which voltage is to be applied at the calculated electrical angle, among the gates of the plurality of first switching elements (111, 121, 131) and the gates of the plurality of second switching elements (112, 122, 132). [10] Motor drive device (9) according to claim 9, wherein the switching control (30) further comprises an identification part (321) that detects a torque corresponding to an actuation range of an accelerator pedal and identifies a frequency of the current to be output in order to rotate the rotor (4) of the switched reluctance motor (2) at a speed corresponding to the torque, and The application part (322) performs chopper control by repeatedly starting and stopping the application of voltage to the identified gate, causing the inverter part (10) to output current at a frequency identified by the identification part (321). [11] Motor drive system (1) comprising a motor (2) and a motor drive device (9), wherein the motor (2) is a switched reluctance motor (2) comprising i) a rotor (4) rotatably arranged about a rotating shaft (3) and having a plurality of prominent poles (5) formed on its outer circumference, and ii) a stator (6) arranged around the outside of the rotor (4) and having a plurality of tooth sections (7) formed on its inner circumference, wherein a winding of one phase under windings of a plurality of phases around each of the plurality of tooth sections (7) is wound, the motor drive device (9) comprises: an inverter part (10) comprising a first switching element (111, 121, 131) whose source is connected to a power supply and a second switching element (112, 122, 132) whose drain is connected to a ground, and a plurality of switching arms (11, 12, 13) connected in parallel to a drain of the first switching element (111, 121, 131) and a source of the second switching element (112, 122, 132), a diode section (20) comprising a pair of diodes (21, 22, 23) for each of the switch arms (11, 12, 13), wherein the pair of diodes (21, 22, 23) comprises i) a first diode (211, 221, 231) whose anode is connected to a connection between a drain of the first switching element (111, 121, 131) and a source of the second switching element (112, 122, 132), and a second diode (212, 222, 232) whose cathode is connected to the connection, and ii) a) a cathode of the first diode (211, 221, 231) is connected to a first connection in which two adjacent windings are connected in series, and b) an anode of the second diode (212, 222, 232) is connected to a second connection in which two adjacent windings, different from the first connection, are connected in series, and a switching control (30) which controls the voltage to be applied to the gates of the first switching element (111, 121, 131) and second switching element (112, 122, 132) contained in the inverter part (10). [12] Motor drive system (1) according to claim 11, wherein the windings of the multitude of phases comprise windings of phase A, phase B, phase C, phase D, phase E and phase F, and the difference in electrical angle between each of phase A and phase F, phase F and phase E, phase E and phase D, phase D and phase C, phase C and phase B and phase B is 60 degrees, and The windings of phase A, phase B, phase C, phase D, phase E and phase F are connected in series in this order in a ring shape. [13] Motor drive system (1) according to claim 11, wherein the windings of the multitude of phases comprise windings of phase A, phase B, phase C, phase D, phase E and phase F, and the difference in electrical angle between each of phase A and phase F, phase F and phase E, phase E and phase D, phase D and phase C, phase C and phase B and phase B is 60 degrees, and the windings of phase A, phase B, phase C, phase D, phase E and phase F are connected at one end to a neutral point (P).

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