JP2012228065A - Motor drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor drive device capable of continuously driving a motor excellently even when a power source for driving the motor becomes abnormal.SOLUTION: In the motor drive device, first winding and second winding are wound around a core of a motor, and the motor drive device comprises a first power source connected with the first winding so that a current flows only to the first winding, a second power source connected with the second winding so that the current flows only to the second winding, and a selection part for selecting the power source to be used to drive the motor between the first power source and the second power source. The selection part selects the power source to be used to drive the motor so that the current from the first power source flows to the first winding when the first power source is normal and the current from the second power source flows to the second winding when the first power source is abnormal.

Description

  The present invention relates to a motor drive device that drives a motor mounted on a vehicle, and in particular, a motor drive that supplies a drive current from a power source to a motor for moving a movable member included in the vehicle such as a power steering mechanism. Relates to the device.

  2. Description of the Related Art In a vehicle including peripheral devices such as a wiper, a power window, and a power steering, a configuration in which a motor is mounted to move these peripheral devices is already well known. Such a motor includes a core therein, and a winding is wound around the core, and a driving current (excitation current) from a predetermined power source flows through the winding. And, of course, it is necessary to continue to drive the motor normally so that the peripheral devices move normally while the vehicle is traveling. In order to continue to drive the motor normally, the current is normal to the windings. Must flow into.

  For the above purpose, measures for maintaining a state in which a current continues to flow normally in a motor have been studied (for example, see Patent Document 1). In the electric motor disclosed in Patent Document 1, the motor coil is composed of a four-phase coil, and when the motor coil is disconnected, the disconnected coil and the connected coil are forcibly disconnected, and the motor is switched from four-phase driving to two-phase. It can be switched to driving. With this configuration, the electric motor disclosed in Patent Document 1 can continue to rotate the motor rotor satisfactorily even when the motor coil is disconnected.

JP-A-5-276710

  However, in the electric motor disclosed in Patent Document 1, if an abnormality occurs in the power source for flowing a current through the coil (winding), the current stops flowing through the coil and the motor also stops. The function of the device will not be displayed properly. In particular, if the above peripheral device (for example, a power steering mechanism) stops while the vehicle is traveling, the occupant cannot properly control the vehicle, which may lead to a serious accident.

  Accordingly, an object of the present invention has been made in view of the above-described problems, and a motor driving device capable of continuing to drive a motor satisfactorily even when an abnormality occurs in a motor driving power source. Is to realize.

  According to the motor driving device of the present invention, the above-described problem is the first winding wound around the core provided in the motor mounted on the vehicle, and the core wound together with the first winding. A first power source connected to the first winding such that a current flows only through the first winding of the second winding, the first winding, and the second winding; and Of the winding and the second winding, when the second power supply is connected to the second winding so that current flows only through the second winding, and the first power supply is normal, the motor When the first power source is abnormal so that the current from the first power source flows through the first winding, the current from the second power source is driven to drive the motor. Selection to select a power source to be used from among the first power source and the second power source so as to flow through the second winding When is solved by having.

  In the motor drive device having the above configuration, two types of windings are wound around the core provided in the motor, and the power source (first power source) connected to one of the windings is in an abnormal state. Even if the current from the power supply stops flowing, the power supply (second power supply) connected to the other winding functions as a backup. As a result, in order to continue driving the motor, a current from the backup power supply flows. In other words, according to the motor drive device of the present invention, even when the first power source for flowing current to the windings becomes abnormal, the peripheral device of the vehicle is continuously operated and the safety of the vehicle is improved. It becomes possible to secure.

  In the motor drive device, the selection unit may be configured to output power from the first power source to drive the motor when both the first power source and the second power source are in a normal state. It is preferable to select a power source that uses both the first power source and the second power source so that a current flows through the first winding and a current from the second power source flows through the second winding. is there. In the motor drive device having such a configuration, if both the first power supply and the second power supply are in a normal state and current is allowed to flow from each of the two types of power supplies, one power supply is stopped. At that time, it is possible to easily grasp the abnormality of the one power source by specifying that the output of the motor has decreased.

  In the motor driving apparatus, the motor is a brushless motor, and the selection unit is a controller that controls the brushless motor, includes the first winding, and a current from the first power source flows. A first circuit that includes a first circuit and a second circuit that includes the second winding and through which a current from the second power source flows; and wherein the controller controls a conduction state of the first circuit; It is more preferable to have a second control unit that controls the conduction state of the second circuit. With the motor drive device having such a configuration, the control by the first control unit and the control by the second control unit can be performed independently, so even if one of the power supplies becomes abnormal, the brushless It becomes possible to continue to appropriately control the drive of the motor.

  In the motor driving apparatus, the motor is a movable member motor for moving a movable member included in the vehicle, and the first power source is a low voltage that supplies electric power to drive the movable member motor. It is a battery, and the second power source is more preferably a high-voltage battery that supplies electric power to a vehicle driving motor mounted on the vehicle in order to drive the vehicle. With the motor drive device having such a configuration, it is not necessary to separately provide a backup power source for the movable member motor, and it is possible to avoid an increase in size of the motor drive device and a vehicle on which the device is mounted.

  In the motor driving apparatus, the core includes a cylindrical cylindrical portion and a plurality of teeth arranged along an inner periphery of the cylindrical portion, and each of the teeth includes the first winding. It is more preferable that both the second winding and the second winding are wound. The second conductor constituting the second winding is thinner than the first conductor constituting the first winding, and both the first winding and the second winding are It is even more preferable that the second conductor is wound around the teeth such that the second conductor is positioned outside the teeth than the first conductor. With this configuration, the first conductor and the second conductor can be satisfactorily spread in each slot, and the space factor of both conductors in the slot is improved.

  Alternatively, the core includes a cylindrical cylindrical portion and a plurality of teeth arranged at regular intervals along the inner periphery of the cylindrical portion, and the first winding and the second winding are respectively Further, the teeth may be alternately wound around the teeth along the inner periphery of the cylindrical portion. With this configuration, the first conductor (specifically, the coil made of the first conductor) and the second conductor (specifically, the coil made of the second conductor) are included in the cylindrical portion. It arrange | positions at equal intervals along a periphery. As a result, even when one power supply becomes abnormal, current (current from the other power supply) flows in a balanced manner in the motor.

In the motor driving apparatus, the applied voltage of the high voltage battery is boosted and applied to the vehicle driving motor, the applied voltage of the low voltage battery is a, and the applied voltage of the high voltage battery before boosting The voltage is b, the applied voltage after boosting the high-voltage battery is c, the wire diameter of the first conductor constituting the first winding is d1, and the second conductor constituting the second winding When the wire diameter of the first conductor is d2, the wire diameter d1 of the first conductor and the wire diameter d2 of the second conductor satisfy the following two expressions (1) and (2): Even more preferred.
√ (a / c) ≦ d1 ≦ √ (a / b) (1)
√ (b / a) ≦ d2 ≦ √ (c / a) (2)
With such a configuration, the value of each applied voltage can be taken into account in consideration of the value of each applied voltage, so that the wire diameter of each conductor of the first conductor and the second conductor can be set to the optimum wire diameter. It is possible to realize a motor with a high output per unit.

  According to the motor driving device of the present invention, even if the power source (first power source) connected to one winding becomes abnormal and the current from the power source stops flowing, it is connected to the other winding. The power supply (second power supply) functions as a backup, and the current from the power supply flows, so that the motor can be continuously driven. As a result, the safety of the vehicle is ensured.

It is a figure showing vehicle S carrying low voltage battery EV and high voltage battery HEV. It is a figure which shows the 1st example regarding the structure of the motor drive device 1 which concerns on this embodiment. It is the figure which showed the schematic cross section of the stator 10 about the motor M1 driven by the motor drive device 1 shown by FIG. It is a figure which shows the structure of the coil | winding 14 wound by each teeth 12. FIG. It is a figure which shows the 2nd example regarding the structure of the motor drive device 1 which concerns on this embodiment. It is the figure which showed the schematic cross section of the stator 10 about the motor M1 driven by the motor drive device 1 shown by FIG.

<< Regarding Motor Driving Device 1 According to the Present Embodiment >>
A motor drive device 1 according to an embodiment of the present invention (hereinafter, this embodiment) will be described with reference to FIGS. FIG. 1 is a diagram showing a vehicle S equipped with a low voltage battery EV and a high voltage battery HEV. FIG. 2 is a diagram illustrating a first example relating to the configuration of the motor drive device 1 according to the present embodiment. FIG. 3 is a diagram showing a schematic cross section of the stator 10 for the motor M1 driven by the motor drive device 1 shown in FIG. FIG. 4 is a view showing the structure of the winding 14 wound around each tooth 12, and specifically, an enlarged view of a range indicated by symbol A in FIG. FIG. 5 is a diagram illustrating a second example relating to the configuration of the motor drive device 1 according to the present embodiment. FIG. 6 is a schematic cross-sectional view of the stator 10 for the motor M1 driven by the motor drive device 1 shown in FIG.

In describing the motor drive device according to the present embodiment (hereinafter simply referred to as the motor drive device 1), the vehicle S using the motor drive device 1 will be described.
The motor drive device 1 is attached to a vehicle S as an example of a vehicle. In particular, the vehicle S according to the present embodiment includes an electric power steering mechanism (not shown) as an example of a movable member. The electric power steering mechanism is moved by an electric power steering motor M1 (hereinafter simply referred to as “motor M1”) as a movable member motor. Specifically, the steering force is assisted by driving the motor M1. And the vehicle S has the low voltage battery EV (refer FIG. 1) as a drive source of the motor M1.

  On the other hand, the vehicle S according to the present embodiment is an automobile that travels using electricity as power, such as a hybrid car or an electric automobile. That is, the vehicle S has a vehicle travel motor M2 as a vehicle travel motor, and travels by driving the vehicle travel motor M2. The vehicle S includes a high voltage battery HEV (see FIG. 1) as a drive source for the vehicle travel motor M2.

As described above, the vehicle S according to the present embodiment has two different power supplies, and one power supply supplies a drive current mainly for driving the motor M1 for the power steering mechanism. EV. In addition, the rated value of the applied voltage of the low voltage battery EV in this embodiment is 12V.
The other power source is a high voltage battery HEV that supplies a driving current to a vehicle driving motor M2 mounted on the vehicle S in order to drive the vehicle S. In the present embodiment, the applied voltage of the high voltage battery HEV is boosted and applied to the vehicle travel motor M2, and the rated value of the applied voltage before boosting is a value within a range of 100V to 300V (for example, 100V Or the rated value of the applied voltage after boosting is, for example, 650V.

  Next, the structure of the motor M1 will be outlined. The motor M1 is an inner rotor type brushless motor, and includes a rotor (not shown) and a stator 10 (see, for example, FIG. 3) disposed on the radially outer side of the rotor. The stator 10 is wound with a winding 14 through which a drive current (excitation current) from a predetermined power source flows.

  More specifically, the stator 10 has a core 11 formed by coaxially laminating a core sheet (not shown) made of a thin magnetic material such as a silicon steel plate having an insulating film formed on the surface thereof. And as shown in FIG. 3, the core 11 has the outer cylinder part 11a as a cylindrical cylinder part, and several teeth 12 arranged in a regular interval along the inner periphery of the outer cylinder part 11a. ing. A winding 14 made of a copper wire as a conductor is wound around the tooth 12. That is, a groove-like slot 15 is formed between the teeth 12, and a copper wire (specifically, a first copper wire 13 a and a second copper wire 13 b described later) constituting the winding 14 is provided in each slot 15. And is satisfactorily spread in each slot 15 (see, for example, FIG. 4).

  In the case of this embodiment, each winding 14 is wound around the corresponding tooth 12 by concentrated winding. However, it is not limited to this, The structure wound by the distributed winding may be sufficient.

  Further, while the vehicle is running, the output of the motor M1 is constantly monitored. Specifically, the output is detected periodically by an output detector 22 that detects the motor output and transmits a signal indicating the detection result (hereinafter, output signal). Monitored.

  Next, the 1st example regarding the structure of the motor drive device 1 is demonstrated. In this example, in order to make the explanation easy to understand, the configuration of the motor M1 will be described by taking a configuration having six slots as an example. However, the configuration described in this example is set for convenience of explanation, and is different from the actual configuration. For example, each of the three-phase windings 14 is wound around the core 11 by concentrated winding. If the number of magnetic poles is 10 or 14, and the number of slots is 12, or if each of the three-phase windings 14 is wound in distributed winding, the number of slots A configuration in which is the number of magnetic poles × 3 (for three phases) × 2 (double) is considered as an actual configuration. Note that the number of magnetic poles and the number of slots described above are merely examples, and other numbers may be used.

  The motor drive device 1 includes a well-known position detection sensor (hereinafter simply referred to as a sensor 16) including a Hall element, a rectifying element, a position detection magnet, and the like, and a control circuit (specifically, a low-voltage side circuit 17 described later). And a high-voltage side circuit 18), which detect the position of the rotor during rotation. Based on the position signal obtained by this position detection and the speed setting value, the motor drive device 1 causes the stator 10 to generate a rotating magnetic field by causing a current from a predetermined power source to flow through each phase winding 14 through the control circuit. . Thereby, a rotor comes to rotate stably.

  In this embodiment, two power supplies for supplying an exciting current for rotating the rotor of the motor M1 are prepared, and a three-phase winding 14 is wound around the core 11 for each power supply. More specifically, the above-described low-voltage battery EV is provided as a first power source for supplying an exciting current to the winding 14. In other words, a three-phase (U-phase, V-phase, W-phase) winding 14 (indicated as 14 Ua, 14 Va, and 14 Wa in FIG. 2) is wound around the core 11 in order to use the current flowing from the low-voltage battery EV as an excitation current. Each winding 14 is electrically connected to a low voltage battery EV. Here, the winding 14 electrically connected to the low voltage battery EV corresponds to a first winding, and a current from the low voltage battery EV flows as an exciting current in the first winding.

  On the other hand, the above-described high voltage battery HEV is provided as a second power source for passing an exciting current through the winding 14. As described above, the high voltage battery HEV supplies electric power to the vehicle driving motor M2 in order to drive the vehicle S. In the present embodiment, when the low voltage battery EV becomes abnormal, the high voltage battery HEV functions as a power source for driving the motor M1 instead of the low voltage battery EV. Therefore, in order to use the current from the high-voltage battery HEV as the exciting current for rotating the rotor of the motor M1, the three-phase windings 14 (14Ub, 14Vb, 14Wb in FIG. (Notation) is wound around the core 11 together with the first winding, and each winding 14 is electrically connected to the high voltage battery HEV. Here, the winding 14 electrically connected to the high voltage battery HEV corresponds to a second winding, and a current from the high voltage battery HEV flows as an exciting current in the second winding.

  As described above, in this embodiment, two paths for supplying a drive current for driving the motor M1 are prepared, and each path is independent of each other. That is, while the current from the low voltage battery EV flows through the winding 14 (first winding) electrically connected to the low voltage battery EV, the winding 14 (electrically connected to the high voltage battery HEV) A current from the high voltage battery HEV flows through the second winding). In other words, the low voltage battery EV is connected to the first winding so that the current flows only through the first winding of the first winding and the second winding, and the high voltage battery HEV is connected to the first winding. Of the winding and the second winding, the second winding is connected so that current flows only through the second winding.

  When the low voltage battery EV is normal, the current from the low voltage battery EV flows to the first winding to drive the motor M1, and when the low voltage battery EV is abnormal, the motor M1 is driven. , The current from the high voltage battery HEV flows through the second winding. Hereinafter, a configuration for realizing such an operation will be described in more detail.

  In the present embodiment, the motor drive device 1 further includes a controller 19, and the controller 19 controls a motor M1 that is a brushless motor and a vehicle travel motor M2. Further, the controller 19 operates when the low voltage battery EV is abnormal so that when the low voltage battery EV is normal, the current from the low voltage battery EV flows to the first winding in order to drive the motor M1. In order to drive the motor M1, the power source used to drive the motor M1 is selected from the low voltage battery EV and the high voltage battery HEV so that the current from the high voltage battery HEV flows in the second winding. Functions as a selection unit.

As shown in FIG. 2, the controller 19 includes a low voltage side circuit 17, a high voltage side circuit 18, a first control unit 20, and a second control unit 21.
The low voltage side circuit 17 corresponds to a first control circuit, and is a circuit including a first winding among the windings 14 wound around the core 11 of the motor M1 and through which a current from the low voltage battery EV flows. . In addition, the part (henceforth a low voltage side circuit main body) except the 1st coil | winding among the low voltage side circuits 17 has a field effect transistor and diode which are not shown in figure as a component.

  The first control unit 20 includes a CPU, a ROM, and a RAM, and controls the conduction state of the low voltage side circuit 17 based on a position detection signal from the sensor 16. Specifically, the first control unit 20 switches between supply and stop of current to the first winding by a field effect transistor included in the low-voltage side circuit body. Thereby, it becomes possible to control the supply of the drive current from the low voltage battery EV to the motor M1, in other words, the supply of the applied voltage of the low voltage battery EV to the motor M1.

  The high voltage side circuit 18 is a circuit through which a current from the high voltage battery HEV flows, and includes a normal circuit 18a and an abnormal circuit 18b as shown in FIG. The normal circuit 18a is a circuit for boosting the voltage applied from the high voltage battery HEV and supplying it to the vehicle travel motor M2 by a boosting mechanism (not shown). The abnormal circuit 18b corresponds to a second control circuit, and includes a second winding among the windings 14 wound around the core 11 of the motor M1, and includes a field effect transistor, a diode, and a step-down mechanism (not shown). As a component. That is, the abnormal circuit 18b is connected to the second winding, and when the low voltage battery EV is abnormal, the voltage applied from the high voltage battery HEV is stepped down by the step-down mechanism and supplied to the motor M1. It is a circuit for.

  The second control unit 21 includes a CPU, a ROM, and a RAM, and supplies power to the vehicle driving motor M2 during normal time (that is, when the low voltage battery EV is normal). Controls the conduction state of the high-voltage side circuit 18 (more specifically, the normal circuit 18a and the abnormal circuit 18b) so as to supply power to both the motor M1 and the vehicle driving motor M2 when abnormal. It is. In particular, when the low voltage battery EV is abnormal, the second control unit 21 controls the conduction state of the abnormal circuit 18 b based on the position detection signal from the sensor 16. Specifically, the second control unit 21 switches the supply and stop of the current to the second winding by the field effect transistor provided in the abnormal circuit 18b. This makes it possible to control the supply of drive current from the high voltage battery HEV to the motor M1, in other words, the supply of the applied voltage of the high voltage battery HEV to the motor M1.

  In the present embodiment, the first control unit 20 and the second control unit 21 are mutually connected so that the current flowing through the low voltage side circuit 17 and the current flowing through the abnormal circuit 18b of the high voltage side circuit 18 are synchronized. A signal indicating a waveform of a current flowing in the circuit is transmitted and received. When a phase difference occurs between the two currents, the first control unit 20 and the second control unit 21 respond so as to advance the waveform of one current and delay the waveform of the other current. Adjust the phase of the current.

  The controller 19 having the above-described configuration includes the first control unit 20 and the second control unit 21 to independently control the conduction state of the low voltage side circuit 17 and the high voltage side circuit 18. It is possible. As a result, the controller 19 makes the current supply from the low voltage battery EV through the low voltage side circuit 17 to the motor M1 and the current supply from the high voltage battery HEV through the high voltage side circuit 18 to the motor M1 independent of each other. And can be executed.

  Furthermore, the controller 19 can switch the supply destination of the drive current from the high voltage battery HEV according to the state of the low voltage battery EV. That is, among the components of the controller 19, the second control unit 21 determines whether the low voltage battery EV is normal or abnormal, and when the low voltage battery EV is normal, Only the circuit 18a is energized (current flows), and when the low voltage battery EV is abnormal, both the normal circuit 18a and the abnormal circuit 18b are energized.

  Whether the low voltage battery EV is normal or abnormal is determined based on the output signal transmitted from the output detector 22 described above. Specifically, when the low voltage side circuit 17 is in the energized state and the motor output value of the motor M1 indicated by the output signal is within the normal range (management range), the low voltage battery EV is normal. If it is determined that the motor output value is out of the normal range, it is determined that the low voltage battery EV is abnormal.

Next, of the windings 14 wound around the core 11 of the motor M1, the one connected to the low voltage battery EV (ie, the first winding) and the one connected to the high voltage battery HEV (ie, the first winding) The second winding) will be described with reference to FIGS. 3 and 4. FIG.
In the motor M1 according to the first example of the present embodiment, as shown in FIG. 3, the first winding (indicated as 14 Ua, 14 Va, and 14 Wa in FIG. 3) is wound around the corresponding tooth 12 in the core 11. Has been. Similarly, the second winding (14Ub, 14Vb, 14Wb in FIG. 3) is wound around the corresponding tooth 12.

  Of the three-phase first windings 14, the U-phase winding 14 Ua has the same teeth as the U-phase winding 14 Ub of the three-phase windings 14 through which the current from the high-voltage battery HEV flows. 12 is wound. The same applies to the V phase and the W phase. As described above, in the first example of the present embodiment, both the first winding and the second winding are wound around each of the teeth 12 arranged along the inner periphery of the outer cylinder portion 11a of the core 11. ing.

  More specifically, as shown in FIG. 4, the first winding is constituted by a first copper wire 13a as a first conductor, and the second winding is a second copper as a second conductor. It is constituted by a line 13b. Here, as compared with the first copper wire 13a constituting the first winding, the second copper wire 13b constituting the second winding is thinner (the cross-sectional area is smaller).

  In each tooth 12, both the first winding and the second winding are wound around the tooth 12 so that the second copper wire 13b is positioned outside the tooth 12 relative to the first copper wire 13a. Yes. In other words, the first copper wire 13a and the second copper wire 13b are inserted into each slot 15, and in the slot 15, the thicker first copper wire 13a is located on the inner side when viewed from the tooth 12, and is thinner. The second copper wire 13b is located on the outside as viewed from the tooth 12. That is, in each slot 15, when the first copper wire 13 a is inserted so as to be laminated toward the outside of the tooth 12, a gap is generated at the outermost part of the slot 15, and the second copper wire is filled so as to fill the gap. 13b is inserted. As a result, the first copper wire 13a and the second copper wire 13b can be satisfactorily spread in each slot 15, and the space factor of both copper wires in the slot 15 is improved.

In the present embodiment, the applied voltage of the low voltage battery EV is a, the applied voltage of the high voltage battery HEV before boosting is b, the applied voltage of the high voltage battery HEV after boosting is c, and the first copper wire When the wire diameter of 13a is d1, and the wire diameter of the second copper wire 13b is d2, the wire diameter d1 of the first copper wire 13a and the wire diameter d2 of the second copper wire 13b are the following two formulas: The relations satisfy (1) and (2).
√ (a / c) ≦ d1 ≦ √ (a / b) (1)
√ (b / a) ≦ d2 ≦ √ (c / a) (2)
With such a configuration, each wire diameter of the first copper wire 13a and the second copper wire 13b can be optimized in consideration of the value of each applied voltage. As a result, the output per unit volume is high for each copper wire. The motor M1 can be realized.

In this embodiment, for example, when a = 12V, b = 100V (or 288V), and c = 650V, when these values are substituted into the above two formulas (1) and (2), It becomes like this.
0.135 ≦ d1 ≦ 0.346 (or 0.204) (3)
4.898 (or 2.88) ≦ d2 ≦ 7.359 (4)

  As described above, the motor drive device 1 is provided with a backup power source for the low-voltage battery EV in case the power source for driving the motor M1 is abnormal. It has been. Further, the winding 14 is divided for each power source. Specifically, when the low-voltage battery EV is normal, the first winding through which the current from the low-voltage battery EV flows, and the above-described backup power source Divided into a second winding through which current flows.

  When the low-voltage battery EV is abnormal, the current from the backup power source flows through the second winding in order to drive the motor M1. As a result, even if the low voltage battery EV becomes an abnormal state and the current from the low voltage battery EV does not flow, the backup power supply supplies power to the motor M1, so that the drive of the motor M1 can be maintained. become. That is, the motor drive device 1 can continue to appropriately drive the electric power steering mechanism of the vehicle S even when the low voltage battery EV becomes abnormal while the vehicle S is traveling. The vehicle S can be brought close to the road shoulder. As a result, by mounting the motor drive device 1 according to the present embodiment, the safety of the vehicle S is ensured, and it is possible to avoid a serious accident caused by the failure of the low voltage battery EV.

  Further, in the present embodiment, the high voltage battery HEV that supplies electric power to the vehicle driving motor M2 is diverted as a backup power source for the low voltage battery EV. And it becomes possible to avoid the enlargement of the vehicle S carrying the motor drive device 1.

  Further, in the present embodiment, the controller 19 includes the first control unit 20 and the second control unit 21 so that the conduction states of the low voltage side circuit 17 and the high voltage side circuit 18 are controlled independently. Is possible. That is, in the present embodiment, since the control by the first control unit 20 and the control by the second control unit 21 can be performed independently, any one of the low voltage battery EV and the high voltage battery HEV is abnormal. Even in this case, it is possible to continue to appropriately control the driving of the motor M1 which is a brushless motor.

  Next, a second example regarding the configuration of the motor drive device 1 will be described. Hereinafter, the configuration of the motor M1 will be described with an example in which the number of slots (in other words, the number of teeth 12) is twelve. In the following description, the description of the configuration common to the first example (for example, the material of the first winding and the second winding) will be omitted.

  Also in the second example, since the high voltage battery HEV is diverted as a backup power source for the low voltage battery EV, it is necessary to provide the backup power source separately. As in the first example, the winding 14 connected to the low voltage battery EV (ie, the first winding) and the winding 14 connected to the high voltage battery HEV (ie, the second winding) Both of them are wound around the core 11 of the motor M1, and when the low voltage battery EV is abnormal, the drive of the motor M1 can be maintained by flowing the current from the high voltage battery HEV through the second winding. Is possible. Further, the controller 19 includes a first control unit 20 and a second control unit 21, and the conduction states of the low voltage side circuit 17 and the high voltage side circuit 18 can be controlled independently. That is, also in the second example, the control by the first control unit 20 and the control by the second control unit 21 can be performed independently. In the above points, the second example is common to the first example.

  On the other hand, in the second example, at the normal time, a drive current is supplied from both the low voltage battery EV and the high voltage battery HEV to the motor M1 to drive the motor M1. That is, in the second example, when both the low voltage battery EV and the high voltage battery HEV are in a normal state, the controller 19 uses the current from the low voltage battery EV to drive the motor M1. Both the low voltage battery EV and the high voltage battery HEV are selected as power sources for driving the motor M1 so that the current flows from one winding and the current from the high voltage battery HEV flows to the second winding. In this respect, the second example is different from the first example.

  The above difference will be described in more detail. As shown in FIG. 5, the high voltage side circuit 18 according to the second example includes a travel motor drive circuit 18c and a motor drive circuit 18d. The travel motor drive circuit 18c is a circuit for boosting the voltage applied from the high voltage battery HEV and supplying it to the vehicle travel motor M2 by a boost mechanism (not shown). The motor drive circuit 18d corresponds to a second control circuit, includes a second winding among the windings 14 wound around the core 11 of the motor M1, and includes a field effect transistor, a diode, and a step-down voltage not shown. It has a mechanism as a component. That is, the motor drive circuit 18d is a circuit for stepping down the voltage applied from the high voltage battery HEV by the step-down mechanism and supplying it to the motor M1.

  In the second example, the second control unit 21 supplies the electric power of the high voltage battery HEV to the vehicle travel motor M2 through the travel motor drive circuit 18c at the normal time, and the high voltage battery HEV through the motor drive circuit 18d. Is supplied to the motor M1. That is, during normal times, the low voltage battery EV and the high voltage battery HEV cooperate to supply the motor M1 with a driving force for driving the motor M1. In other words, in the second example, during the normal time, the first control unit 20 is configured such that the current from the low voltage battery EV flows through the first winding and the current from the high voltage battery HEV flows through the second winding. Controls the conduction state of the low voltage side circuit 17, and the second control unit 21 controls the conduction state of the motor drive circuit 18d of the high voltage side circuit 18, respectively.

  On the other hand, when the low-voltage battery EV becomes abnormal, the high-voltage battery HEV alone supplies a drive current to the motor M1. That is, the second control unit 21 maintains the motor drive circuit 18d of the high voltage side circuit 18 in the energized state even after the low voltage battery EV becomes abnormal.

  As described above, in the second example, regardless of the state of the low voltage battery EV, the second control unit 21 is, for example, during traveling of the vehicle S, throughout the travel, and the traveling motor drive circuit 18c of the high voltage side circuit 18 is used. And the motor drive circuit 18d are both energized. Thereby, even if the low voltage battery EV becomes abnormal while the vehicle S is traveling, the drive current from the high voltage battery HEV is continuously supplied to the motor M1, so that the drive of the motor M1 can be maintained. Become.

  Further, in the second example, even when the high voltage battery HEV becomes abnormal and the current supply from the high voltage battery HEV to the motor M1 is stopped, the current supply from the low voltage battery EV to the motor M1 is maintained. Therefore, it becomes possible to maintain the drive of the motor M1. That is, in the second example, since the drive current is supplied to the motor M1 from both the low voltage battery EV and the high voltage battery HEV in the normal state, even if one of the two becomes abnormal, the current from the other is Since the motor M1 is continuously supplied, the electric power steering mechanism of the vehicle S can continue to be driven appropriately, and the vehicle S can be quickly brought close to the road shoulder. As a result of the above, it is possible to secure the safety of the vehicle S by mounting the motor driving device 1 according to the second example on the vehicle S.

  In the second example, during normal times, a drive current is supplied from both the low voltage battery EV and the high voltage battery HEV to the motor M1, and the motor output at that time is constantly monitored by the output detector 22 described above. When either one of the low-voltage battery EV and the high-voltage battery HEV becomes abnormal, the motor output value indicated by the output signal transmitted from the output detector 22 decreases. And it can be grasped | ascertained that either one battery is abnormal by specifying the fall of this motor output value. As a result, in the second example, it is possible to easily grasp that one of the batteries has become abnormal.

  Next, regarding the motor M1 according to the second example, among the windings 14 wound around the core 11, the first winding connected to the low voltage battery EV and the second winding connected to the high voltage battery HEV. Each winding state of the winding will be described with reference to FIG.

  In the motor M1 according to the second example, as illustrated in FIG. 6, the three-phase first windings (indicated as 14U, 14V, and 14W in FIG. 6) are wound around the corresponding teeth 12 in the core 11. ing. On the other hand, a three-phase second winding (14X, 14Y, 14Z in FIG. 6) is wound around a tooth 12 different from the tooth 12 around which the first winding is wound. Note that the first winding and the second winding are wound around the tooth 12 in opposite winding directions.

  Further, the first winding and the second winding are wound around the teeth 12 alternately along the inner circumference of the outer cylinder portion 11 a of the core 11. Here, a plurality (12 pieces) of teeth 12 arranged along the inner periphery of the outer cylinder portion 11a of the core 11 are evenly arranged at regular intervals (about 30 degrees) along the inner periphery of the outer cylinder portion 11a. ing. In other words, the first winding and the second winding are also alternately wound around the teeth 12 at a constant pitch along the inner periphery of the outer cylindrical portion 11a. As a result, even when one of the low voltage battery EV and the high voltage battery HEV becomes abnormal, the current (current from the other battery) flows in a balanced manner in the motor. As a result, even after any one of the batteries becomes abnormal, the rotor of the motor M1 can be rotated satisfactorily.

<< Other Embodiments >>
In the above embodiments, the motor driving device of the present invention has been mainly described. However, the above embodiment is for facilitating the understanding of the present invention, and does not limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof.

  In particular, in the above-described embodiment, the motor drive device 1 that drives the motor M1 for the electric power steering mechanism has been described. However, the motor drive device of the present invention is a motor used for other movable members, for example, the vehicle S. It can also be applied to motors used in automatic window opening / closing mechanisms (power windows) and wiper mechanisms.

  In the above embodiment, the vehicle S is cited as an example of the vehicle, and the motor driving device 1 for driving the motor M1 mounted on the vehicle S has been described. However, vehicles other than the vehicle S, for example, a ship or the like The motor driving device of the present invention can also be applied to a motor mounted on an aircraft.

1 motor drive device, 10 stator,
11 core, 11a outer cylinder part, 12 teeth,
13a 1st copper wire, 13b 2nd copper wire,
14 windings, 15 slots, 16 sensors,
17 Low voltage side circuit, 18 High voltage side circuit,
18a normal circuit, 18b abnormal circuit,
18c travel motor drive circuit, 18d motor drive circuit,
19 controller, 20 first control unit, 21 second control unit,
22 output detector,
EV low voltage battery, HEV high voltage battery M1 motor, M2 vehicle running motor,
S vehicle

Claims (8)

A first winding wound around a core provided in a motor mounted on a vehicle;
A second winding wound around the core together with the first winding;
Of the first winding and the second winding, a first power source connected to the first winding so that a current flows only through the first winding;
A second power source connected to the second winding such that a current flows only through the second winding of the first winding and the second winding;
When the first power supply is normal, the motor is driven when the first power supply is abnormal so that a current from the first power supply flows through the first winding to drive the motor when the first power supply is normal. And a selection unit that selects a power source to be used from the first power source and the second power source so that a current from the second power source flows through the second winding. A motor drive device.   In the selection unit, when both the first power source and the second power source are in a normal state, a current from the first power source flows in the first winding in order to drive the motor. The motor according to claim 1, wherein the motor is selected as a power source that uses both the first power source and the second power source so that a current from the second power source flows in the second winding. Drive device. The motor is a brushless motor;
The selection unit is a controller that controls the brushless motor,
A first circuit including the first winding and through which a current from the first power source flows;
A second circuit including the second winding and through which a current from the second power source flows.
The said controller has a 1st control part which controls the conduction | electrical_connection state of the said 1st circuit, and a 2nd control part which controls the conduction | electrical_connection state of the said 2nd circuit, The Claim 1 or Claim 2 characterized by the above-mentioned. The motor drive device described. The motor is a movable member motor for moving a movable member included in the vehicle,
The first power source is a low-voltage battery that supplies electric power to drive the movable member motor;
The said 2nd power supply is a high voltage battery which supplies electric power to the motor for vehicle travel mounted in the said vehicle in order to drive the said vehicle, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. The motor drive device described. The core has a cylindrical cylindrical portion and a plurality of teeth arranged along the inner periphery of the cylindrical portion,
The motor driving apparatus according to claim 4, wherein both the first winding and the second winding are wound around each of the teeth. The second conductor constituting the second winding is thinner than the first conductor constituting the first winding,
Both the first winding and the second winding are wound around the teeth so that the second conductor is positioned outside the teeth with respect to the first conductor. The motor drive device according to claim 5. The core has a cylindrical cylindrical portion and a plurality of teeth arranged at regular intervals along the inner periphery of the cylindrical portion,
5. The motor driving device according to claim 4, wherein the first winding and the second winding are wound around the teeth alternately along the inner periphery of the cylindrical portion. The applied voltage of the high voltage battery is boosted and applied to the vehicle running motor,
The applied voltage of the low voltage battery is a, the applied voltage of the high voltage battery before boosting is b, the applied voltage of the high voltage battery after boosting is c, and the first conductivity constituting the first winding. When the wire diameter of the body is d1, and the wire diameter of the second conductor constituting the second winding is d2, the wire diameter d1 of the first conductor and the wire diameter d2 of the second conductor Is in a relationship satisfying the following two formulas (1) and (2): 8. The motor driving device according to claim 4, wherein:
√ (a / c) ≦ d1 ≦ √ (a / b) (1)
√ (b / a) ≦ d2 ≦ √ (c / a) (2)

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