JP2011182492A - Dynamo-electric machine control unit and electric power steering device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamo-electric machine control part detecting severance of DC bus in a power converter with a simple configuration. <P>SOLUTION: An inverter part 20 includes switching element pairs 27 (MOS 21, 24), 28 (MOS 22, 25), 29 (MOS 23, 26) and converts power supplied to a motor 10. Bridge resistors 31 to 33 are connected mutually so that one end is connected to a high-potential side of a battery 80 of the switching element pairs 27 to 29, and the other end becomes common potential. A resistor 35 connects a common potential part of the bridge resistors 31 to 33 to a low-potential side of the battery 80. A microcomputer 70 controls drive of a motor 10, and functions as a bridge resistor voltage detection means to detect a voltage of the common potential part. The microcomputer 70 detects a fault between the battery 80 and the switching element pairs 27 to 29 based on the voltage detected by the bridge resistor voltage detection means. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine control device and an electric power steering device using the same.

  2. Description of the Related Art Conventionally, a rotating electrical machine control device that controls driving of a rotating electrical machine by controlling on / off switching of a power converter including a plurality of switching elements is known. In such a rotating electrical machine control device, a bus bar is generally used for a DC bus (electrical connection between a power source and a switching element and between switching elements) of a power converter. The bus bar is formed of a conductive material such as a copper plate, and a relatively large current flows when the rotating electric machine is driven. The bus bar is assembled to the device or the like by caulking, welding, screwing, or the like, but may be disconnected due to aging or vibration. When the bus bar is disconnected, the current flowing through the rotating electrical machine changes, and the output torque of the rotating electrical machine changes accordingly. When such a rotary electric machine control device is used for electric power steering, if the bus bar is disconnected and the output torque of the rotary electric machine changes, the operator of the vehicle may feel anxiety or danger.

  Patent Document 1 discloses an electric motor drive device that detects disconnection of a winding by biasing a voltage of a predetermined phase of the winding of a rotating electric machine with a pull-up resistor. In this motor drive device, (1) the upper and lower potentials of the high potential side switching element are substantially the same due to the influence of the parasitic diode of the switching element, and (2) the resistance of the winding of the motor is less than the pull-up resistance. Therefore, all the phases of the windings have substantially the same potential. From (1) and (2), since the magnitude of the monitor voltage does not change even if the bus bar (DC bus) is disconnected, this motor drive device cannot detect disconnection of the bus bar.

JP 2006-50707 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a rotating electrical machine control device capable of detecting a disconnection of a DC bus of a power converter with a simple configuration.

  According to the first aspect of the present invention, there is provided a rotating electrical machine control device that controls a rotating electrical machine that has a winding set composed of windings corresponding to a plurality of phases or terminals and that is driven by electric power supplied from a first power supply. It is. The rotating electrical machine control device is switched by a high potential side switching element disposed on the high potential side of the first power supply and a low potential side switching element disposed on the low potential side corresponding to each phase or each terminal of the winding. A power converter having a plurality of switching elements forming an element pair and converting power supplied to the rotating electrical machine, one end of which is connected to the high potential side or the low potential side of the first power supply of the switching element pair, and the other end A plurality of resistors connected to each other so as to have a common potential, a resistor connecting a common potential portion of the plurality of resistors and a low potential side or a high potential side of the first power supply, and the common potential portion And a control unit that controls driving of the rotating electrical machine by switching on and off of the switching element. In the present invention, the control unit can detect an abnormality between the first power supply and the switching element pair based on the voltage detected by the bridge resistance voltage detecting means. Here, “abnormality between the first power supply and the switching element pair” means, for example, “electrical connection between the first power supply and the switching element pair, that is, disconnection of the DC bus of the power converter” It is. As described above, in the present invention, it is possible to detect the disconnection of the DC bus of the power converter with a simple configuration.

  The invention described in claim 2 further includes a power supply relay, a capacitor, a second power supply, a first switch, a high potential side resistor, a second switch, and a terminal voltage detecting means. ing. The power supply relay is controlled to be turned on or off by the control unit, so that the current flow between the first power supply, the power converter, and the rotating electrical machine can be allowed or cut off. One end of the capacitor is connected between the power relay and the power converter, and the other end is connected to the low potential side of the first power source. The second power supply has a voltage smaller than that of the first power supply, and the high potential side is connected between the one end of the capacitor and the power supply relay. The first switch is controlled to be turned on or off by the control unit, so that the current flow between the second power source and the one end of the capacitor can be allowed or cut off. The high potential side resistor connects the high potential side of the first power source and a predetermined phase or terminal of the plurality of phases or terminals of the rotating electrical machine. The second switch is allowed to be turned on or off by the control unit, so that the current flow between the first power supply and the high potential side resistor can be allowed or cut off. The terminal voltage detection means can detect the voltage of the terminal of each phase of the winding. In the present invention, the control unit can detect a winding abnormality based on the voltage detected by the terminal voltage detecting means. Here, the “winding abnormality” is, for example, “winding of the winding”. In the present invention, based on the voltage detected by the bridge resistance voltage detecting means, “abnormality between the first power source and the switching element pair” is used as “disconnection of the DC bus of the power converter”, “ It is possible to detect “short circuit failure”, “second power source failure”, “first switch failure”, and “power relay short circuit failure”. As described above, in the present invention, it is possible to detect not only “abnormality between the first power supply and the switching element pair” but also “abnormality of the winding”.

  The invention described in claim 3 further includes a power supply relay, a capacitor, a second power supply, a high potential side resistor, a first switch, and a terminal voltage detecting means. The power supply relay is controlled to be turned on or off by the control unit, and can allow or block the flow of current between the first power supply, the power converter, and the rotating electrical machine. One end of the capacitor is connected between the power relay and the power converter, and the other end is connected to the low potential side of the first power source. The voltage of the second power source is set to be smaller than that of the first power source. The high potential side resistor connects the high potential side of the second power source and a predetermined phase or terminal of the plurality of phases or terminals of the rotating electrical machine. The first switch can be controlled to be turned on or off by the control unit, so that the current flow between the second power supply and the high potential side resistor can be allowed or cut off. The terminal voltage detection means can detect the voltage of the terminal of each phase of the winding. In the present invention, the control unit can detect a winding abnormality based on the voltage detected by the terminal voltage detecting means. Here, the “winding abnormality” is, for example, “winding of the winding”. In the present invention, based on the voltage detected by the bridge resistance voltage detecting means, “abnormality between the first power source and the switching element pair” is used as “disconnection of the DC bus of the power converter”, “ It is possible to detect “short circuit failure”, “second power source failure”, “first switch failure”, and “power relay short circuit failure”. As described above, in the present invention, it is possible to detect not only “abnormality between the first power supply and the switching element pair” but also “abnormality of the winding”.

  The invention described in claim 4 is a more specific example of the invention described in claim 2. In the present invention, the control unit first controls the power supply relay to be turned off. Then, the control unit performs control so that the first switch is turned on, and detects an abnormality between the first power source and the switching element pair based on the voltage detected by the bridge resistance voltage detection unit at this time. Further, the control unit controls the second switch to be turned on, and detects an abnormality of the winding based on the voltage detected by the terminal voltage detection means at this time. Thus, in the present invention, “abnormality between the first power supply and the switching element pair” and “winding abnormality” are detected by the above procedure.

  The invention described in claim 5 is a more specific example of the invention described in claim 3. In the present invention, the control unit first controls the power supply relay to be turned off. Then, the control unit controls the first switch to be turned on after being controlled to be turned on for a predetermined time. At this time, based on the voltage detected by the bridge resistance voltage detecting means, the first power source and the high potential side are controlled. Abnormality with the switching element is detected. Thereafter, the control unit performs control so that the first switch is turned on again, and detects an abnormality of the winding based on the voltage detected by the terminal voltage detection means at this time. Thus, in the present invention, “abnormality between the first power supply and the switching element pair” and “winding abnormality” are detected by the above procedure.

  An electric power steering apparatus according to a sixth aspect includes the rotating electrical machine control apparatus according to any one of claims 1 to 5 and the rotating electrical machine. As described above, the rotating electrical machine control device according to any one of claims 1 to 5 can detect at least “disconnection of the DC bus of the power converter”. As described above, when the DC bus of the power converter is disconnected, the output torque of the rotating electrical machine changes. In the present invention, when the DC bus of the power converter is disconnected, this can be notified to the steering operator, for example. Therefore, the present invention is particularly suitable for an electric power steering apparatus in which a change in output torque of a rotating electrical machine is directly connected to an operator's operation feeling.

The schematic diagram which shows the rotary electric machine control apparatus by 1st Embodiment of this invention. 1 is an exploded perspective view of a rotating electrical machine control device and a rotating electrical machine according to a first embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating the method of the abnormality detection by the rotary electric machine control apparatus of 1st Embodiment of this invention, Comprising: (A) is a schematic diagram which shows the circuit of a normal state, (B)-(D) is abnormal. The schematic diagram which shows the circuit of a state. The schematic diagram which shows the rotary electric machine control apparatus by 2nd Embodiment of this invention. The flowchart which shows the process of the abnormality detection which the rotary electric machine control apparatus by 2nd Embodiment of this invention performs. The schematic diagram which shows the rotary electric machine control apparatus by 3rd Embodiment of this invention. The flowchart which shows the process of the abnormality detection which the rotary electric machine control apparatus by 3rd Embodiment of this invention performs. The schematic diagram which shows the rotary electric machine control apparatus by 4th Embodiment of this invention. It is a figure for demonstrating the method of the abnormality detection by the rotary electric machine control apparatus of 4th Embodiment of this invention, Comprising: (A) is a schematic diagram which shows the circuit of a normal state, (B)-(D) is abnormal. The schematic diagram which shows the circuit of a state. The schematic diagram which shows the rotary electric machine control apparatus by 5th Embodiment of this invention. It is a figure for demonstrating the method of the abnormality detection by the rotary electric machine control apparatus of 5th Embodiment of this invention, Comprising: (A) is a schematic diagram which shows the circuit of a normal state, (B) and (C) are abnormalities. The schematic diagram which shows the circuit of a state.

Hereinafter, a rotating electrical machine control apparatus according to the present invention will be described with reference to the drawings. Note that, in a plurality of embodiments, substantially the same configuration is denoted by the same reference numeral, and description thereof is omitted.
(First embodiment)
As shown in FIG. 1, the rotating electrical machine control apparatus 1 according to the first embodiment of the present invention controls driving of a motor 10 as a rotating electrical machine. The rotating electrical machine control device 1 is employed together with the motor 10 in, for example, an electric power steering device for assisting the steering operation of the vehicle.

  The motor 10 is a three-phase brushless motor and has a rotor and a stator (not shown). The rotor is a disk-shaped member, and a permanent magnet is affixed to the surface thereof and has a magnetic pole. The stator accommodates the rotor inside and supports it rotatably. The stator has a protruding portion that protrudes at a predetermined angle in the radially inward direction, and the U coil 11, the V coil 12, and the W coil 13 shown in FIG. 1 are wound around the protruding portion. The U coil 11, the V coil 12, and the W coil 13 are windings corresponding to the U phase, the V phase, and the W phase, respectively, and constitute a winding set 18 as a whole. The motor 10 is provided with a position sensor 79 that detects the rotational position.

The rotating electrical machine control device 1 includes an inverter unit 20 as a power converter, bridge resistors 31 to 33 as a plurality of resistors, a resistor 35 as a resistor, a bridge resistance voltage detection means, a microcomputer 70 as a control unit, and the like. ing.
The inverter unit 20 is a three-phase inverter, and six switching elements 21 to 26 are bridge-connected to switch energization to the U coil 11, the V coil 12, and the W coil 13 of the winding set 18. In this embodiment, the switching elements 21 to 26 are MOSFETs (metal-oxide-semiconductor field-effect transistors) which are a kind of field effect transistors. Hereinafter, the switching elements 21 to 26 are referred to as MOSs 21 to 26.

  The drains of the three MOSs 21 to 23 are connected to the bus bar 2 as the upper bus connected to the positive side of the battery 80 as the first power source. The sources of the MOSs 21 to 23 are connected to the drains of the MOSs 24 to 26, respectively. The sources of the MOSs 24 to 26 are connected to the bus bar 3 serving as a lower bus connected to the negative electrode side of the battery 80. The bus bar 3 is connected to the ground. FIG. 2 is an exploded perspective view of the rotating electrical machine control device 1 and the motor 10 of the present embodiment. As shown in FIG. 2, the bus bar 2 and the bus bar 3 are formed in a flat plate shape from a conductive material such as copper. The bus bar 2 and the bus bar 3 are assembled to members or the like constituting the outer shell of the motor 10 by, for example, caulking, welding, or screwing.

  As shown in FIG. 1, the connection point between the paired MOS 21 and MOS 24 is connected to one end of the U coil 11. A connection point between the paired MOS 22 and MOS 25 is connected to one end of the V coil 12. Furthermore, the connection point between the paired MOS 23 and MOS 26 is connected to one end of the W coil 13.

  Here, the MOSs 21 to 23 correspond to “high potential side switching elements” in the inverter unit 20. Further, the MOSs 24 to 26 correspond to “low potential side switching elements” in the inverter unit 20. Hereinafter, as appropriate, the “high potential side switching element” is referred to as “upper MOS”, and the “low potential side switching element” is referred to as “lower MOS”. In addition, the corresponding phase is also described as needed, such as “U lower MOS 24”. Further, hereinafter, a combination of the MOS 21 and the MOS 24 is appropriately referred to as a “switching element pair 27”, a combination of the MOS 22 and the MOS 25 is referred to as a “switching element pair 28”, and a combination of the MOS 23 and the MOS 26 is referred to as a “switching element pair 29”.

  Thus, in this embodiment, the rotating electrical machine control device 1 has one system of inverters (inverter unit 20). The operation of the inverter unit 20 is controlled by a microcomputer 70 described later, and the electric power supplied from the battery 80 to the motor 10 is converted so that the motor 10 can rotate.

  One end of each of the bridge resistors 31 to 33 is connected to the bus bar 2 and the other end is connected to each other so as to have a common potential. For example, the bridge resistor 31 is connected to the connection point between the bus bar 2 and the MOS 21, the bridge resistor 32 is connected to the connection point between the bus bar 2 and the MOS 22, and the bridge resistor 33 is connected to the connection point between the bus bar 2 and the MOS 23. Yes. The resistor 35 connects the other end (common potential portion) of the bridge resistors 31 to 33 and the low potential side of the battery 80, that is, the ground.

  In the present embodiment, as shown in FIG. 1, the rotating electrical machine control device 1 includes a power relay 81. The power relay 81 is provided between the battery 80 of the bus bar 2 and the inverter unit 20. The power supply relay 81 is controlled to be turned on or off by a microcomputer 70 to be described later, thereby allowing or blocking a current flow between the battery 80, the inverter unit 20, and the motor 10. In the present embodiment, the power supply relay 81 is a so-called normally open type power supply relay, and when there is no ON command from the microcomputer 70, the current flow is cut off because of the open state (OFF state). When the ON command is issued, the current flow is permitted because the closed state (ON state) is entered.

  In the present embodiment, the rotating electrical machine control device 1 includes a capacitor 60. One end of the capacitor 60 is connected between the power supply relay 81 of the bus bar 2 and the MOS 21, and the other end is connected between the ground of the bus bar 3 and the MOS 24. That is, the capacitor 60 is provided between the battery 80 and the inverter unit 20. Capacitor 60 accumulates electric charge, thereby assisting power supply to MOSs 21 to 26 and suppressing ripple current generated when power is supplied from battery 80 to motor 10.

The microcomputer 70 as a control unit is a small computer having an integrated circuit and the like, and is connected to various components and detection means of the rotating electrical machine control device 1. A program is stored in the storage unit of the microcomputer 70, and the microcomputer 70 executes various processes according to the program and controls the operation of the connection destination component and the like.
The microcomputer 70 is connected to each of the power supply relay 81 and the MOSs 21 to 26. In FIG. 1, connection lines between the microcomputer 70 and the MOSs 21 to 26 are omitted in order to prevent the drawing from becoming complicated. An ignition power supply 71 is connected to the microcomputer 70. When the operator of the vehicle turns on the ignition key, electric power is supplied from the ignition power supply 71 to the microcomputer 70, and various processes by the microcomputer 70 are started.

  In the present embodiment, the microcomputer 70 controls the power supply relay 81 to be in the closed state (on state) by sending an on command to the power supply relay 81, so that the battery 80, the inverter unit 20, and the motor 10 are connected. Allow current flow. On the other hand, when the microcomputer 70 does not send an ON command to the power relay 81, the power relay 81 is in an open state (off state), and thus the current flow is interrupted. In this way, the microcomputer 70 controls the operation of the power supply relay 81 to be on or off, thereby permitting or blocking the current flow.

  Further, when the current flow is permitted by the power supply relay 81, the microcomputer 70 switches the MOSs 21 to 26 on and off, thereby converting the direct current from the battery 80 into a sine wave current having a phase different for each phase. It converts and flows into the coil (U coil 11, V coil 12, and W coil 13) of each phase. Thereby, the motor 10 rotates. The microcomputer 70 adjusts the torque and rotation speed of the motor 10 by PWM control. Thus, the microcomputer 70 controls the driving of the motor 10 by switching the MOSs 21 to 26 on and off.

  The microcomputer 70 is connected between the bridge resistors 31 to 33 and the resistor 35, that is, to the common potential portion of the bridge resistors 31 to 33. Thereby, the microcomputer 70 can detect the voltage of the common potential portion. Here, the microcomputer 70 corresponds to “bridge resistance voltage detection means” in the claims. Hereinafter, the voltage detected by the bridge resistance voltage detection means is appropriately referred to as “bridge resistance voltage: Vb”.

  In the present embodiment, the microcomputer 70 is connected between the battery 80 and the switching element pairs 27 to 29 (particularly on the high potential side of the battery 80) based on the voltage (bridge resistance voltage: Vb) detected by the bridge resistance voltage detecting means. An abnormality can be detected. Hereinafter, a method of detecting the abnormality will be described with reference to FIG. FIG. 3 shows only a part of the rotating electrical machine control device 1 and the vicinity of the bridge resistors 31 to 33. Here, the voltage of the battery 80 is 12 V, the resistance value of the bridge resistors 31 to 33 is 15 kΩ, and the resistance value of the resistor 35 is 5 kΩ. The bridge resistance voltage (Vb) is a voltage detected in a state where the power supply relay 81 is controlled to be on. Therefore, at this time, the bus bar 2 is in a state where a voltage of 12 V is applied from the battery 80.

When the bus bar 2 is not disconnected (normal) as shown on the left side of the white arrow in FIG. 3A, the equivalent circuit is as shown on the right side of the white arrow. From this equivalent circuit,
Vb = 12 / {(15/3 + 5) / 5} = 6 Equation 1
Therefore, when the voltage detected by the bridge resistance voltage detection means is 6 V, the microcomputer 70 determines that “the bus bar 2 is not disconnected (normal)”.

In a state where the bridge resistance 32 and the bridge resistance 33 of the bus bar 2 are disconnected as shown on the left side of the white arrow in FIG. 3B, the equivalent circuit is as shown on the right side of the white arrow. From this equivalent circuit,
Vb = 12 / {(15/2 + 5) / 5} = 4.8 Formula 2
Therefore, when the voltage detected by the bridge resistance voltage detection means is 4.8 V, the microcomputer 70 indicates that “the bridge resistance 32 of the bus bar 2 and the bridge resistance 33 are disconnected (abnormal)”. Judge.

In a state where the bridge resistor 31 and the bridge resistor 32 of the bus bar 2 are disconnected as shown on the left side of the white arrow in FIG. 3C, the equivalent circuit is as shown on the right side of the white arrow. From this equivalent circuit,
Vb = 12 / {(15 + 5) / 5} = 3 Equation 3
Therefore, when the voltage detected by the bridge resistance voltage detection means is 3 V, the microcomputer 70 determines that “the bridge resistance 31 and the bridge resistance 32 of the bus bar 2 are disconnected (abnormal)”. To do.

In a state where the battery 80 and the bridge resistor 31 are disconnected as shown on the left side of the white arrow in FIG. 3D, the equivalent circuit is as shown on the right side of the white arrow. From this equivalent circuit,
Vb = 0 / {(0 + 5) / 5} = 0 Equation 4
Therefore, when the voltage detected by the bridge resistance voltage detecting means is 0 V, the microcomputer 70 determines that “the battery 80 and the bridge resistor 31 are disconnected (abnormal)”.

  As described above, in the present embodiment, the microcomputer 70 detects an abnormality between the battery 80 and the switching element pairs 27 to 29 based on the voltage (Vb) detected by the bridge resistance voltage detection unit, in particular, “bus bar 2 "Disconnection" and "disconnection location" can be detected. Thus, in this embodiment, the disconnection of the bus bar 2 of the inverter unit 20 can be detected with a simple configuration.

  In this embodiment, the example which applies the rotary electric machine control apparatus 1 which can detect the disconnection of the bus-bar 2 of the inverter part 20 to the electric power steering apparatus was shown. Here, when the bus bar 2 is disconnected, this may be notified to the steering operator. Thereby, it is possible to prevent the operator from being surprised when the assist force changes suddenly due to the disconnection of the bus bar 2. Therefore, it can be said that this embodiment is particularly suitable for the electric power steering apparatus in which the change in the output torque of the motor 10 is directly connected to the operation feeling of the operator.

(Second Embodiment)
A rotating electrical machine control apparatus according to a second embodiment of the present invention is shown in FIG. The second embodiment is different from the first embodiment in that the second embodiment further includes a second power source, a first switch, a high-potential side resistor, a second switch, a terminal voltage detection unit, and the like.

As shown in FIG. 4, the rotating electrical machine control apparatus according to the present embodiment includes a battery 85 as a second power source, a switch 86 as a first switch, a pull-up resistor 90 as a high potential side resistor, a second A switch 91 is provided as a switch.
The battery 85 has a voltage lower than that of the battery 80, and the high potential side is connected between one end of the capacitor 60 and the power supply relay 81. In the present embodiment, the voltage of the battery 85 is 5V.

  The switch 86 is controlled to be turned on or off by the microcomputer 70, and can allow or block the flow of current between the battery 85 and the one end of the capacitor 60. In the present embodiment, a resistor 87 is provided between the switch 86 and the one end of the capacitor 60. The resistor 87 is provided to prevent a large current from flowing instantaneously from the battery 85 to the capacitor 60 when the switch 86 is turned on. The resistance value of the resistor 87 is set to an arbitrary value such as 10Ω or 100Ω. Here, for example, if the function of limiting excessive output from the battery 85 is provided, the resistor 87 may not be provided.

The pull-up resistor 90 connects the U coil 11, which is a V-phase winding of the motor 10, and the high potential side of the battery 80. That is, in the present embodiment, the U phase is pulled up by the pull-up resistor 90. The resistance value of the pull-up resistor 90 is larger than the respective resistance values of the U coil 11, the V coil 12, and the W coil 13. In the present embodiment, the resistance value of the pull-up resistor 90 is set to, for example, 100 times or more (1 kΩ) of the respective resistance values of the U coil 11, the V coil 12, and the W coil 13. Hereinafter, the resistance value of the pull-up resistor 90 is appropriately expressed as “Rpullup”.
The switch 91 is controlled to be turned on or off by the microcomputer 70, and can allow or block the flow of current between the battery 85 and the pull-up resistor 90.

  As shown in FIG. 4, in the present embodiment, the rotating electrical machine control device includes a U voltage detection unit 51, a V voltage detection unit 52, and a W voltage detection unit 53. The U voltage detector 51 has one end connected between the U upper MOS 21 and the U lower MOS 24 and the other end connected to the ground, and detects the voltage applied to the U coil 11, that is, the voltage at the terminal of the U coil 11. To do. One end of the V voltage detection unit 52 is connected between the V upper MOS 22 and the V lower MOS 25 and the other end is connected to the ground, and the voltage applied to the V coil 12, that is, the voltage at the terminal of the V coil 12 is detected. To do. The W voltage detection unit 53 has one end connected between the W upper MOS 23 and the W lower MOS 26 and the other end connected to the ground, and detects the voltage applied to the W coil 13, that is, the voltage at the terminal of the W coil 13. To do.

  In the U voltage detection unit 51, a U upper resistor 510 and a U lower resistor 511 are connected in series, and the microcomputer 70 is connected between the U upper resistor 510 and the U lower resistor 511. Thereby, the voltage value (U-phase terminal voltage: Vu) of the terminal of the U coil 11 detected by the U voltage detector 51 is input to the microcomputer 70. The V voltage detection unit 52 includes a V upper resistor 520 and a V lower resistor 521 connected in series, and the microcomputer 70 is connected between the V upper resistor 520 and the V lower resistor 521. Thereby, the voltage value (V phase terminal voltage: Vv) of the terminal of the V coil 12 detected by the V voltage detection unit 52 is input to the microcomputer 70. The W voltage detection unit 53 includes a W upper resistor 530 and a W lower resistor 531 connected in series, and the microcomputer 70 is connected between the W upper resistor 530 and the W lower resistor 531. Thereby, the voltage value (W-phase terminal voltage: Vw) of the terminal of the W coil 13 detected by the W voltage detection unit 53 is input to the microcomputer 70. Thus, the microcomputer 70 can detect the voltage of the terminal of each phase. Here, the microcomputer 70 corresponds to “terminal voltage detection means” in the claims. Hereinafter, the detection value detected by the voltage detection units 51 to 53 is appropriately referred to as “terminal voltage”. Further, hereinafter, the resistance value of the U upper resistor 510 is appropriately “RupU”, the resistance value of the U lower resistor 511 is “RdownU”, the resistance value of the V upper resistor 520 is “RupV”, and the resistance value of the V lower resistor 521 is appropriately “RdownV”, the resistance value of the W upper resistor 530 is represented by “RupW”, and the resistance value of the W lower resistor 531 is represented by “RdownW”. In this embodiment, the resistance values of the U upper resistor 510, the U lower resistor 511, the V upper resistor 520, the V lower resistor 521, the W upper resistor 530, and the W lower resistor 531 are all set to the same value (for example, 1 kΩ). ing.

  Next, processing before the motor 10 is started by the microcomputer 70 will be described with reference to FIG. In the present embodiment, the microcomputer 70 executes a series of processes shown in FIG. 5, step S100 (hereinafter, “step” is omitted and simply indicated by the symbol “S”) before the motor 10 is started. As the execution timing of S100, for example, “immediately after the operator of the vehicle turns on the ignition key” or “immediately after a momentary interruption of power to the rotating electrical machine control device 1 occurs while the motor 10 is rotating” or the like. Assumed.

When S100 is started, the process first proceeds to S101.
In S101, the microcomputer 70 controls the power supply relay 81 to be turned off, the switch 86 to be turned on, and the switch 91 to be turned off. Thereby, the electric charge from the battery 85 starts to be accumulated (charged) in the capacitor 60. After S101, the process proceeds to S102.

  In S102, the microcomputer 70 stands by for a predetermined time. Thereby, the charging of the capacitor 60 is completed, and the voltage of the capacitor 60 becomes 5 V, which is equivalent to the battery 85. Therefore, at this time, the bus bar 2 is in a state where a voltage of 5 V is applied from the battery 85 or the capacitor 60. Note that the switch 86 may be turned off after the capacitor 60 is completely charged. After S102, the process proceeds to S103.

  In S103, the microcomputer 70 detects the bridge resistance voltage (Vb) by the bridge resistance voltage detection means, and “whether an abnormality has occurred between the battery 80 and the switching element pairs 27 to 29” based on the detected value. Judging. The specific method of judgment is as follows.

If the detected bridge resistance voltage (Vb) is 2.5 V, the microcomputer 70 determines that “there is no abnormality (normal) between the battery 80 and the switching element pairs 27 to 29”. This is because Vb is expressed by the following formula 5 when “no abnormality has occurred (normal) between the battery 80 and the switching element pairs 27 to 29”.
Vb = 5 / {(15/3 + 5) / 5} = 2.5 Formula 5

When the detected bridge resistance voltage (Vb) is 2V, the microcomputer 70 "disconnects between the bridge resistance 32 and the bridge resistance 33 of the bus bar 2", that is, "battery 80 and switching element pairs 27 to 29". It is judged that an abnormality has occurred during This is based on Equation 6 below.
Vb = 5 / {(15/2 + 5) / 5} = 2 Expression 6

When the detected bridge resistance voltage (Vb) is 1.25 V, the microcomputer 70 causes the “bridge between the bridge resistor 31 and the bridge resistor 32 of the bus bar 2 to be disconnected”, that is, “battery 80 and switching element pair 27˜ 29 ”is determined. This is based on Equation 7 below.
Vb = 5 / {(15 + 5) / 5} = 1.25 Formula 7

  When the detected bridge resistance voltage (Vb) is 0 V, the microcomputer 70 indicates that “the battery 85 and the bridge resistor 31 are disconnected”, “the capacitor 60 is short-circuited”, and “the battery 85 is faulty. (No output from battery 85) "or" Switch 86 is out of order (ON control is not possible) ", that is," Abnormality has occurred between battery 80 and switching element pair 27-29 ". To do.

When the detected bridge resistance voltage (Vb) is 6 V, the microcomputer 70 indicates that “the power supply relay 81 has a short circuit failure”, that is, “an abnormality has occurred between the battery 80 and the switching element pairs 27 to 29”. Judge. This is based on Equation 8 below.
Vb = 12 / {(15/3 + 5) / 5} = 6 Expression 8

  When it is determined that “no abnormality has occurred between the battery 80 and the switching element pairs 27 to 29 (normal)” (S103: Y), the process proceeds to S104. On the other hand, when it is determined that “an abnormality has occurred between the battery 80 and the switching element pairs 27 to 29” (S103: N), the process of S100 is exited.

  In S <b> 104, the microcomputer 70 controls the power supply relay 81 to be off, controls the switch 86 to be on, and controls the switch 91 to be on. That is, the control of the switch 91 is changed from off control to on control. Here, the switch 86 may be controlled to be turned off. After S104, the process proceeds to S105.

  In S105, the microcomputer 70 detects the terminal voltage (terminal voltage) of each phase by the terminal voltage detecting means, and based on the detected value, the “winding (winding group 18, U coil 11, V coil 12, W coil). 13) It is determined whether or not an abnormality has occurred. The specific method of judgment is as follows.

When the detected values of the U-phase terminal voltage (Vu), the V-phase terminal voltage (Vv), and the W-phase terminal voltage (Vw) are values represented by the following formulas 9 to 11, respectively, the microcomputer 70 No abnormality has occurred (normal) ”.
Vu = 5 × {(RdownU) / (Rpululup + RupU + RdownU)} Expression 9
Vv = 5 × {(RdownV) / (Rpulup + RupV + RdownV)} Expression 10
Vw = 5 × {(RdownW) / (Rpulup + RupW + RdownW)} Expression 11

  In this embodiment, since Rpullup, RupU, RdownU, RupV, RdownV, RupW, and RdownW are all 1 k (Ω), Vu, Vv, and Vw have the same value in equations 9-11.

  If any one of the detected values of the U-phase terminal voltage (Vu), V-phase terminal voltage (Vv), and W-phase terminal voltage (Vw) is 0, the microcomputer 70 indicates that “the voltage becomes 0. It is determined that the winding of the other phase has been disconnected ”, that is,“ An abnormality has occurred in the winding or the like ”. For example, when Vu is 0, it is determined that “the U coil 11 that is the U-phase winding is disconnected”.

When the detected values of the U-phase terminal voltage (Vu), the V-phase terminal voltage (Vv), and the W-phase terminal voltage (Vw) are the values shown in the following formulas 12 to 14, respectively, It is determined that any one of ˜23 has a short circuit failure ”, that is,“ an abnormality has occurred in the winding or the like ”.
Vu = 5 × {(RdownU) / (RupU + RdownU)} Expression 12
Vv = 5 × {(RdownV) / (RupV + RdownV)} Expression 13
Vw = 5 × {(RdownW) / (RupW + RdownW)} Expression 14
In the present embodiment, Vu, Vv, and Vw have the same value in Expressions 12 to 14.

When the detected U-phase terminal voltage (Vu), V-phase terminal voltage (Vv), and W-phase terminal voltage (Vw) are all 0 V, the microcomputer 70 indicates that any one of the lower MOSs 24 to 26 is short-circuited. That is, it is determined that “an abnormality has occurred in the winding or the like”.
When it is determined that “no abnormality has occurred in the winding or the like (normal)” (S105: Y), the process proceeds to S106. On the other hand, when it is determined that “an abnormality has occurred in the winding or the like” (S105: N), the process of S100 is exited.

  In S <b> 106, the microcomputer 70 controls the power supply relay 81 to be on, controls the switch 86 to be off, and controls the switch 91 to be off. That is, the control of the switch 86 and the switch 91 is changed from on control to off control, and the control of the power relay 81 is changed from off control to on control. Thereby, the electric power of the battery 80 can be supplied to the inverter 20 side. After S106, the process proceeds to S107.

In S107, the microcomputer 70 controls on and off of the MOSs 21 to 26 so that the PWM output of the inverter unit 20 becomes 50%. At this time, the U-phase terminal voltage (Vu), the V-phase terminal voltage (Vv), W The phase terminal voltage (Vw) is detected. When the detected values of the U-phase terminal voltage (Vu), the V-phase terminal voltage (Vv), and the W-phase terminal voltage (Vw) are all 6 V (half of 12 V), the microcomputer 70 is “MOS 21 to 26”. It is determined that the on / off operation is normal and PWM control can be performed correctly, that is, “the MOSs 21 to 26 are not abnormal (normal)”. On the other hand, when the detected U-phase terminal voltage (Vu), V-phase terminal voltage (Vv), and W-phase terminal voltage (Vw) are values other than 6 V, the microcomputer 70 determines that “on / off of the MOSs 21 to 26”. It is determined that the OFF operation is not normal and PWM control cannot be performed correctly, that is, “the MOSs 21 to 26 are abnormal”.
When it is determined that “the MOSs 21 to 26 are not abnormal (normal)” (S107: Y), the process proceeds to “EPS drive start”, and the drive of the electric power steering apparatus is started. On the other hand, when it is determined that “an abnormality has occurred in the MOSs 21 to 26” (S107: N), the process of S100 is exited.

  As described above, in S103, S105, and S107, when it is determined that some abnormality has occurred, the process exits S100. At this time, regarding the abnormality, information may be stored in the storage unit of the microcomputer 70, or the vehicle operator may be notified by display or voice.

As described above, in this embodiment, the bridge resistance voltage (Vb) is detected by the bridge resistance voltage detecting means, and based on this detected value, “bus bar 2 disconnection”, “capacitor 60 short-circuit failure”, “battery 85 failure” "Abnormality between the battery 80 and the switching element pairs 27 to 29" such as "failure of the switch 86" or the like can be detected. Further, the terminal voltage detecting means detects the voltage (terminal voltage) of each phase terminal, and based on the detected value, “winding of the winding”, “short failure of the upper MOSs 21 to 23 or the lower MOSs 24 to 26”, that is, “ It is possible to detect "abnormality of windings (winding group 18, U coil 11, V coil 12, W coil 13)".
As described above, in this embodiment, it is possible to detect “abnormality between the battery 80 and the switching element pairs 27 to 29” as well as “abnormality of windings”.

(Third embodiment)
A rotating electrical machine control apparatus according to a third embodiment of the present invention is shown in FIG. The third embodiment is different from the first embodiment in that it further includes a second power source, a first switch, a high-potential side resistor, a terminal voltage detection unit, and the like. The third embodiment is different from the second embodiment in that “the arrangement of the second power source and the first switch, etc.” and “the point that the second switch is not provided”.

As shown in FIG. 6, the rotating electrical machine control device according to the present embodiment is similar to the second embodiment in that the battery 85 as the second power source, the switch 86 as the first switch, and the pull as the high potential side resistor are used. An up resistor 90 is provided.
In the present embodiment, the high potential side of the battery 85 is connected to one end of the pull-up resistor 90. The switch 86 is provided between the battery 85 and the pull-up resistor 90 and is controlled to be turned on or off by the microcomputer 70, thereby permitting a current flow between the battery 85 and the pull-up resistor 90. Can be shut off.

  Next, processing before the motor 10 is started by the microcomputer 70 will be described with reference to FIG. In the present embodiment, the microcomputer 70 executes a series of processes shown in FIG. 7, step S200, before the motor 10 is started. As in the second embodiment, the execution timing of S200 is, for example, “immediately after the vehicle operator turns on the ignition key” or “instantaneous power interruption to the rotating electrical machine control device 1 while the motor 10 is rotating”. “Immediately after the occurrence”.

When S200 is started, the process first proceeds to S201.
In S201, the microcomputer 70 controls the power supply relay 81 to be turned off and the switch 86 to be turned on. Thereby, the electric charge from the battery 85 starts to be accumulated (charged) in the capacitor 60. After S201, the process proceeds to S202.

  In S202, the microcomputer 70 waits for a predetermined time. Thereby, the charging of the capacitor 60 is completed, and the voltage of the capacitor 60 becomes 5 V, which is equivalent to the battery 85. After S202, the process proceeds to S203.

  In S203, the microcomputer 70 controls the power supply relay 81 to be off and the switch 86 to be off. That is, the control of the switch 86 is changed from on control to off control. Therefore, at this time, the bus bar 2 is in a state where a voltage of 5 V is applied from the capacitor 60. After S203, the process proceeds to S204.

  In S204, the microcomputer 70 detects the bridge resistance voltage (Vb) by the bridge resistance voltage detecting means, and “whether an abnormality has occurred between the battery 80 and the switching element pairs 27 to 29” based on the detected value. Judging. Specifically, as in the process in S103 of the second embodiment, the determination is made based on Expressions 5 to 8 and the like.

  If it is determined that “no abnormality has occurred between the battery 80 and the switching element pairs 27 to 29 (normal)” (S204: Y), the process proceeds to S205. On the other hand, when it is determined that “an abnormality has occurred between the battery 80 and the switching element pairs 27 to 29” (S204: N), the process of S200 is exited.

  In S205, the microcomputer 70 controls the power supply relay 81 to be turned off and the switch 86 to be turned on. That is, the control of the switch 86 is changed from off control to on control. After S205, the process proceeds to S206.

In S206, the microcomputer 70 detects the terminal voltage of each phase (terminal voltage) by the terminal voltage detecting means, and based on the detected value, the “winding (winding group 18, U coil 11, V coil 12, W coil). 13) It is determined whether or not an abnormality has occurred. Specifically, the determination is made based on Equations 9 to 14 and the like, similar to the processing in S105 of the second embodiment.
When it is determined that “no abnormality has occurred in the winding or the like (normal)” (S206: Y), the process proceeds to S207. On the other hand, when it is determined that “an abnormality has occurred in the winding or the like” (S206: N), the process of S200 is exited.

  In S207, the microcomputer 70 turns on the power supply relay 81 and turns on the switch 86. That is, the control of the power supply relay 81 is changed from the off control to the on control. Thereby, the electric power of the battery 80 can be supplied to the inverter 20 side. Here, the switch 86 may be controlled to be turned off. After S207, the process proceeds to S208.

In S208, the microcomputer 70 controls on and off of the MOSs 21 to 26 so that the PWM output of the inverter unit 20 becomes 50%. At this time, the U-phase terminal voltage (Vu), the V-phase terminal voltage (Vv), W The phase terminal voltage (Vw) is detected. When the detected values of the U-phase terminal voltage (Vu), the V-phase terminal voltage (Vv), and the W-phase terminal voltage (Vw) are all 6 V (half of 12 V), the microcomputer 70 is “MOS 21 to 26”. It is determined that the on / off operation is normal and PWM control can be performed correctly, that is, “the MOSs 21 to 26 are not abnormal (normal)”. On the other hand, when the detected U-phase terminal voltage (Vu), V-phase terminal voltage (Vv), and W-phase terminal voltage (Vw) are values other than 6 V, the microcomputer 70 determines that “on / off of the MOSs 21 to 26”. It is determined that the OFF operation is not normal and PWM control cannot be performed correctly, that is, “the MOSs 21 to 26 are abnormal”.
When it is determined that “the MOSs 21 to 26 are not abnormal (normal)” (S208: Y), the process proceeds to “EPS drive start” and the drive of the electric power steering apparatus is started. On the other hand, when it is determined that “an abnormality has occurred in the MOSs 21 to 26” (S208: N), the process of S200 is exited.

  As described above, in S204, S206, and S208, if it is determined that some abnormality has occurred, the process exits S200. At this time, as with the second embodiment, information regarding the abnormality may be stored in the storage unit of the microcomputer 70 or may be notified to the vehicle operator by display or voice.

As described above, in this embodiment, the bridge resistance voltage (Vb) is detected by the bridge resistance voltage detecting means, and based on this detected value, “bus bar 2 disconnection”, “capacitor 60 short-circuit failure”, “battery 85 failure” "Abnormality between the battery 80 and the switching element pairs 27 to 29" such as "failure of the switch 86" or the like can be detected. Further, the terminal voltage detecting means detects the voltage (terminal voltage) of each phase terminal, and based on the detected value, “winding of the winding”, “short failure of the upper MOSs 21 to 23 or the lower MOSs 24 to 26”, that is, “ It is possible to detect "abnormality of windings (winding group 18, U coil 11, V coil 12, W coil 13)".
As described above, in the present embodiment, as in the second embodiment, in addition to “abnormality between the battery 80 and the switching element pairs 27 to 29”, “abnormality of the windings” can also be detected.

(Fourth embodiment)
A rotating electrical machine control apparatus according to a fourth embodiment of the present invention is shown in FIG. The fourth embodiment is different from the first embodiment in the connection destination such as the bridge resistance.

  In the fourth embodiment, one end of each of the bridge resistors 31 to 33 is connected to the bus bar 3, and the other end is connected to each other so as to have a common potential. For example, the bridge resistor 31 is connected to the connection point between the bus bar 3 and the MOS 24, the bridge resistor 32 is connected to the connection point between the bus bar 3 and the MOS 25, and the bridge resistor 33 is connected to the connection point between the bus bar 3 and the MOS 26. Yes. The resistor 35 connects the other end (common potential portion) of the bridge resistors 31 to 33 and the bus bar 2, that is, the high potential side of the battery 80.

  The microcomputer 70 is connected between the bridge resistors 31 to 33 and the resistor 35, that is, to the common potential portion of the bridge resistors 31 to 33. Thereby, the microcomputer 70 can detect the voltage of the common potential portion. Therefore, the microcomputer 70 corresponds to “bridge resistance voltage detection means” in the scope of claims as in the first embodiment. Hereinafter, the voltage detected by the bridge resistance voltage detection means is appropriately referred to as “bridge resistance voltage: Vb”.

  In this embodiment, the microcomputer 70 is connected between the battery 80 and the switching element pairs 27 to 29 (particularly on the low potential side of the battery 80) based on the voltage (bridge resistance voltage: Vb) detected by the bridge resistance voltage detecting means. An abnormality can be detected. Hereinafter, a method for detecting the abnormality will be described with reference to FIG. FIG. 9 shows only a part of the rotating electrical machine control device and the vicinity of the bridge resistors 31 to 33. Here, the bridge resistance voltage (Vb) is a voltage detected in a state where the power supply relay 81 is controlled to be on. Therefore, at this time, the bus bar 2 is in a state where a voltage of 12 V is applied from the battery 80.

When the bus bar 3 is not disconnected (normal) as shown on the left side of the white arrow in FIG. 9A, the equivalent circuit is as shown on the right side of the white arrow. From this equivalent circuit,
Vb = 12 / {(5 + 15/3) / (15/3)} = 6 Equation 15
Therefore, when the voltage detected by the bridge resistance voltage detecting means is 6 V, the microcomputer 70 determines that “the bus bar 3 is not disconnected (normal)”.

In a state where the bridge resistor 32 and the bridge resistor 33 of the bus bar 3 are disconnected as shown on the left side of the white arrow in FIG. 3B, the equivalent circuit is as shown on the right side of the white arrow. From this equivalent circuit,
Vb = 12 / {(5 + 15/2) / (15/2)} = 7.2 Expression 16
Therefore, when the voltage detected by the bridge resistance voltage detecting means is 7.2 V, the microcomputer 70 indicates that “the bridge resistance 32 and the bridge resistance 33 of the bus bar 3 are disconnected (abnormal)”. Judge.

When the bridge resistance 31 and the bridge resistance 32 of the bus bar 3 are disconnected as shown on the left side of the white arrow in FIG. 3C, the equivalent circuit is as shown on the right side of the white arrow. From this equivalent circuit,
Vb = 12 / {(5 + 15) / 15} = 9 Equation 17
Therefore, when the voltage detected by the bridge resistance voltage detecting means is 9 V, the microcomputer 70 determines that “the bridge resistance 31 and the bridge resistance 32 of the bus bar 3 are disconnected (abnormal)”. To do.

In the state where the low potential side of the battery 80 and the bridge resistor 31 are disconnected as shown on the left side of the white arrow in FIG. 3D, the equivalent circuit is as shown on the right side of the white arrow. From this equivalent circuit,
Vb = 12 Expression 18
Therefore, when the voltage detected by the bridge resistance voltage detecting means is 12 V, the microcomputer 70 determines that “the low potential side of the battery 80 and the bridge resistor 31 are disconnected (abnormal)”. To do.

  As described above, in the present embodiment, the microcomputer 70 detects an abnormality between the battery 80 and the switching element pairs 27 to 29 based on the voltage (Vb) detected by the bridge resistance voltage detection unit, in particular, the “bus bar 3 "Disconnection" and "disconnection location" can be detected. Thus, in this embodiment, the disconnection of the bus bar 3 of the inverter unit 20 can be detected with a simple configuration.

(Fifth embodiment)
A rotating electrical machine control apparatus according to a fifth embodiment of the present invention is shown in FIG. The fifth embodiment differs from the first embodiment in the number of switching element pairs and windings.

  As shown in FIG. 10, the rotating electrical machine control device according to the present embodiment includes two switching element pairs (switching element pairs 27 and 28). Therefore, this embodiment can be applied as a control device for a brushless motor or a motor with a brush having windings corresponding to two phases or terminals, for example.

  In the present embodiment, two bridge resistors (bridge resistors 31 and 32) are provided. One end of each of the bridge resistors 31 and 32 is connected to the bus bar 2 and the other end is connected to each other so as to have a common potential. For example, the bridge resistor 31 is connected to the connection point between the bus bar 2 and the MOS 21, and the bridge resistor 32 is connected to the connection point between the bus bar 2 and the MOS 22. The resistor 35 connects the other end (common potential portion) of the bridge resistors 31 and 32 and the low potential side of the battery 80, that is, the ground.

  The microcomputer 70 is connected between the bridge resistors 31 and 32 and the resistor 35, that is, the common potential portion of the bridge resistors 31 and 32. Thereby, the microcomputer 70 can detect the voltage of the common potential portion. Therefore, the microcomputer 70 corresponds to “bridge resistance voltage detection means” in the scope of claims as in the first embodiment. Hereinafter, the voltage detected by the bridge resistance voltage detection means is appropriately referred to as “bridge resistance voltage: Vb”.

  In the present embodiment, the microcomputer 70 is based on the voltage (bridge resistance voltage: Vb) detected by the bridge resistance voltage detecting means between the battery 80 and the switching element pair 27 and 28 (particularly on the high potential side of the battery 80). An abnormality can be detected. Hereinafter, a method of detecting the abnormality will be described with reference to FIG. FIG. 11 shows only a part of the rotating electrical machine control device and the vicinity of the bridge resistors 31 and 32. Here, the bridge resistance voltage (Vb) is a voltage detected in a state where the power supply relay 81 is controlled to be on.

When the bus bar 2 is not disconnected (normal) as shown on the left side of the white arrow in FIG. 11A, the equivalent circuit is as shown on the right side of the white arrow. From this equivalent circuit,
Vb = 12 / {(15/2 + 5) / 5} = 4.8 Expression 19
Therefore, when the voltage detected by the bridge resistance voltage detecting means is 4.8 V, the microcomputer 70 determines that “the bus bar 2 is not disconnected (normal)”.

In a state where the bridge resistor 31 and the bridge resistor 32 of the bus bar 2 are disconnected as shown on the left side of the white arrow in FIG. 11B, the equivalent circuit is as shown on the right side of the white arrow. From this equivalent circuit,
Vb = 12 / {(15 + 5) / 5} = 3 Equation 20
Therefore, when the voltage detected by the bridge resistance voltage detection means is 3 V, the microcomputer 70 determines that “the bridge resistance 31 and the bridge resistance 32 of the bus bar 2 are disconnected (abnormal)”. To do.

In a state where the battery 80 and the bridge resistor 31 are disconnected as shown on the left side of the white arrow in FIG. 11C, the equivalent circuit is as shown on the right side of the white arrow. From this equivalent circuit,
Vb = 0 / {(0 + 5) / 5} = 0 Expression 21
Therefore, when the voltage detected by the bridge resistance voltage detecting means is 0 V, the microcomputer 70 determines that “the battery 80 and the bridge resistor 31 are disconnected (abnormal)”.

  As described above, in the present embodiment, the microcomputer 70 detects an abnormality between the battery 80 and the switching element pair 27, 28 based on the voltage (Vb) detected by the bridge resistance voltage detecting means, in particular, “bus bar 2 "Disconnection" and "disconnection location" can be detected. Thus, in this embodiment, in a rotating electrical machine control device that controls a brushless motor or a brushed motor having windings corresponding to two phases or terminals, it is possible to detect disconnection of the bus bar 2 with a simple configuration. .

(Other embodiments)
The above-described embodiments can be combined as appropriate as long as there are no structural obstruction factors. For example, as another embodiment of the present invention, a combination of the second embodiment and the fourth embodiment, or a combination of the third embodiment and the fourth embodiment can be considered. In these combinations, disconnection of the bus bar on the low potential side can be detected, and disconnection of the windings can also be detected.

  In the above-described embodiment, the example in which various abnormalities are detected based on the voltage detected by the bridge resistance voltage detection unit or the terminal voltage detection unit has been described. In another embodiment of the present invention, even if the detected voltage value does not exactly match the reference value, if it is an approximate value, it may be determined normal or abnormal based on that value.

The present invention is not limited to two-phase or three-phase, and can be applied to a motor having windings of four or more phases.
The present invention can be applied not only to a Y-connection motor but also to a Δ-connection motor.
Furthermore, the present invention can also be applied as a rotating electrical machine control device that controls a rotating electrical machine (an electric motor and a generator) other than the rotating electrical machine for an electric power steering device.

  Thus, the present invention is not limited to the above-described embodiments, and can be applied to various forms without departing from the gist thereof.

  1: rotating electrical machine control device, 10: motor (rotating electrical machine), 11-13: coil (winding), 18: winding set, 20: inverter unit (power converter), 21-23: MOS (high potential side) Switching element), 24-26: MOS (low potential side switching element), 27-29: switching element pair, 31-33: bridge resistance (multiple resistors), 35: resistance (resistors), 70: microcomputer ( Control unit, bridge resistance voltage detection means), 80: battery (first power supply)

Claims (6)

A rotating electrical machine control device that controls a rotating electrical machine that has a winding set composed of windings corresponding to a plurality of phases or terminals, and that is driven by power supplied from a first power supply,
A plurality of switching element pairs are formed by a high potential side switching element disposed on the high potential side of the first power supply and a low potential side switching element disposed on the low potential side corresponding to each phase or each terminal of the winding. A power converter that converts the power supplied to the rotating electrical machine,
A plurality of resistors having one end connected to the high potential side or the low potential side of the first power supply of the switching element pair and the other end connected to each other so as to have a common potential;
A resistor connecting a common potential portion of the plurality of resistors and a low potential side or a high potential side of the first power supply;
A bridge resistance voltage detecting means capable of detecting the voltage of the common potential portion;
A controller that controls driving of the rotating electrical machine by switching on and off of the switching element,
The controller according to claim 1, wherein the controller is capable of detecting an abnormality between the first power supply and the switching element pair based on the voltage detected by the bridge resistance voltage detector. A power relay capable of allowing or interrupting a current flow between the first power source and the power converter and the rotating electrical machine by being controlled on or off by the control unit;
A capacitor having one end connected between the power relay and the power converter and the other end connected to a low potential side of the first power source;
A second power source having a voltage lower than that of the first power source and having a high potential connected between the one end of the capacitor and the power relay;
A first switch capable of allowing or interrupting a current flow between the second power source and the one end of the capacitor by being turned on or off by the control unit;
A high potential side resistor that connects a high potential side of the first power source and a predetermined phase or terminal of the plurality of phases or terminals of the rotating electrical machine;
A second switch capable of allowing or interrupting a current flow between the first power source and the high-potential side resistor by being turned on or off by the control unit;
Terminal voltage detection means capable of detecting the voltage of the terminal of each phase of the winding, and
2. The rotating electrical machine control device according to claim 1, wherein the control unit is capable of detecting an abnormality of the winding based on a voltage detected by the terminal voltage detection unit. A power relay capable of allowing or interrupting a current flow between the first power source and the power converter and the rotating electrical machine by being controlled on or off by the control unit;
A capacitor having one end connected between the power relay and the power converter and the other end connected to a low potential side of the first power source;
A second power supply having a voltage lower than that of the first power supply;
A high potential side resistor that connects a high potential side of the second power source and a predetermined phase or terminal of the plurality of phases or terminals of the rotating electrical machine;
A first switch capable of allowing or blocking a current flow between the second power supply and the high-potential side resistor by being turned on or off by the control unit;
Terminal voltage detection means capable of detecting the voltage of the terminal of each phase of the winding, and
2. The rotating electrical machine control device according to claim 1, wherein the control unit is capable of detecting an abnormality of the winding based on a voltage detected by the terminal voltage detection unit. The controller is
Control the power relay to be turned off,
The first switch is controlled to be turned on, and an abnormality between the first power source and the switching element pair is detected based on the voltage detected by the bridge resistance voltage detection unit at this time,
3. The rotating electrical machine control according to claim 2, wherein the second switch is controlled to be turned on, and an abnormality of the winding is detected based on a voltage detected by the terminal voltage detection unit at this time. apparatus. The controller is
Control the power relay to be turned off,
The first switch is controlled to be turned on after being controlled to be turned on for a predetermined time. At this time, based on the voltage detected by the bridge resistance voltage detecting means, the first power supply and the high potential side switching element are controlled. Detecting anomalies between and
4. The control device according to claim 3, wherein after that, the first switch is controlled to be turned on again, and an abnormality of the winding is detected based on the voltage detected by the terminal voltage detection unit. Rotating electrical machine control device. The rotating electrical machine control device according to any one of claims 1 to 5,
An electric power steering apparatus comprising the rotating electric machine.

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