JP6409480B2 - Disconnection determination device - Google Patents

Description

  The present invention relates to a determination device that determines disconnection of wiring that supplies electric power to a motor or wiring inside the motor.

  In a hybrid vehicle that achieves both a cruising distance and running performance by using an engine and a motor together, a three-phase motor capable of high-speed rotation is employed. In such a three-phase motor, when the internal winding or the wiring connecting the motor and the drive control device is disconnected, the motor does not operate, and it is necessary to promptly switch to driving only the engine.

  Many techniques for detecting such disconnection already exist. For example, when the three-phase currents flowing from the three-phase inverter to the three-phase motor have different peaks, it is determined that the three-phase line connecting the three-phase inverter and the three-phase motor is disconnected (see Patent Document 1). ).

JP 2001-69607 A

  However, in the technique described in Patent Document 1, when the peak of the three-phase current fluctuates due to noise such as electrical noise or mechanical noise or product tolerance, it is assumed that the peak shows a different value even if it is abnormal. Failure to do so may result in misjudgment. On the other hand, if an attempt is made to suppress such erroneous determination, the allowable range for the difference in peak has to be increased, and the drive region of the motor capable of determining disconnection is reduced.

  The present invention has been made in order to solve the above-described problems, and has as its main purpose to suppress a reduction in the drive region of a motor capable of determining disconnection while suppressing erroneous determination of disconnection.

  The present invention is a disconnection determination device for determining a disconnection of a phase wiring for supplying AC power to an AC motor, or an internal wiring of the AC motor to which the AC power is supplied from the phase wiring. Current detection means for detecting a current flowing in the internal wiring, storage means for storing the current detected by the current detection means when the AC motor is not energized as a stored value, and the current when the AC motor is energized And a determination unit that determines disconnection of the phase wiring or the internal wiring based on a comparison between the current detected by the detection unit and the stored value stored by the storage unit. .

  According to the above configuration, the disconnection determination device that determines the disconnection of the phase wiring that supplies AC power to the AC motor, or the internal wiring of the motor that is supplied with AC power from the phase wiring, includes the current detection unit. The current flowing through the wiring or the internal wiring can be detected.

  This disconnection determination device stores the current detected when the motor is de-energized as a stored value by the storage means, and based on the comparison between the current detected during the energization and the stored value, the determination means causes phase wiring or internal wiring. Determine disconnection. For this reason, the influence of noise and product tolerance can be considered as a stored value, and erroneous determination of disconnection can be suppressed. Further, by using the stored value, it is not necessary to excessively increase the disconnection determination value, and it is possible to suppress the reduction of the motor drive area where disconnection determination is possible.

1 is an overall configuration diagram of a motor control system according to an embodiment. It is a disconnection determination flowchart performed by the control device according to the present embodiment. 3 is a timing chart showing a start request signal, a motor current, a failure diagnosis result, and the like according to the present embodiment.

  Hereinafter, the present embodiment applied to a vehicle (for example, an electric vehicle or a hybrid vehicle) including a multiphase motor as an in-vehicle main machine will be described with reference to the drawings.

  As shown in FIG. 1, the motor control system includes a motor generator 10, an inverter 20 as a power conversion device, and a control device 40 that controls the motor generator 10 via the inverter 20.

  In the present embodiment, the motor generator 10 (corresponding to an AC motor) is an in-vehicle main machine, and is connected to drive wheels (not shown). Motor generator 10 is a three-phase motor. The motor generator 10 has an internal wiring 52A (52) having one end connected to the U phase, an internal wiring 52B (52) having one end connected to the V phase, and an internal wiring 52C having one end connected to the W phase. (52). The other end of the internal wiring 52A, the other end of the internal wiring 52B, and the other end of the internal wiring 52C are connected to each other at a neutral point. Each of these internal wirings 52A to 52C has a stator coil. The motor generator 10 includes a rotor (not shown) having, for example, a permanent magnet (magnet). Further, for example, an output shaft of a three-phase motor 12 is connected to a rotor (not shown), and an output torque can be obtained by rotation of the rotor.

  The motor generator 10 is connected to a battery 21 as a DC power source via an inverter 20. The output voltage of the battery 21 is, for example, 100 V or more. The DC power flowing from the battery 21 is inversely converted to AC power by the inverter 20 and supplied to the motor generator 10. A smoothing capacitor 22 that smoothes the input voltage of the inverter 20 is provided in the inverter 20.

  The inverter 20 includes switching elements 23 to 28. A wiring 50 </ b> A (50) connected to the U phase of the motor generator 10 is connected to a connection point between the switching elements 23 and 24. A wiring 50B (50) connected to the V phase of the motor generator 10 is connected to a connection point of the switching elements 25 and 26. A wiring 50 </ b> C (50) connected to the W phase of the motor generator 10 is connected to a connection point between the switching elements 27 and 28. In the present embodiment, IGBTs are used as the switching elements 23 to 28. And each freewheel diode 29-34 is connected to each switching element 23-28 in antiparallel.

  The motor control system further includes phase current detection means, voltage detection means, and rotation angle detection means. Specifically, the phase current detection means includes a V-phase current sensor 42V that detects a current flowing in the V-phase of motor generator 10 and a W-phase current sensor 42W that detects a current flowing in the W-phase. Two V-phase current sensors 42V and two W-phase current sensors 42W are provided on the wirings 50B and 50C, respectively, to form a two-phase two-channel configuration. When the two V-phase current sensors 42V (two W-phase current sensors 42W) are normal, the control device 40 adopts the detected value of one of the V-phase current sensors 42V (W-phase current sensor 42W) as a representative value. To do. The voltage detection means includes a voltage sensor 44 that detects an input voltage of the inverter 20 (a DC voltage output from the battery 21). The rotation angle detection means includes a rotation angle sensor 46 (for example, a resolver) that detects the rotation angle (electrical angle θe) of the motor generator 10.

  The control device (corresponding to storage means and determination means) 40 is mainly composed of a microcomputer, and executes an on / off operation of the switching elements 23 to 28 constituting the inverter 20. Specifically, based on the detection values of the various sensors, operation signals corresponding to the switching elements 23 to 28 are generated, and the generated operation signals are output to the switching elements 23 to 28.

  Next, a series of flows for disconnection determination will be described with reference to the flowchart of FIG.

  The following is a disconnection determination executed by the control device 40.

  First, when the information detected by the position information detection sensor 36 of the shift lever 35 is in the N range or the P range, the motor system is activated (IG-ON), and energization of the inverter 20 is started. Immediately before AC power is supplied from inverter 20 to motor generator 10, V phase current sensor 42V and W phase current sensor 42W continue to detect current I flowing through motor generator 10 until a predetermined time σ has elapsed. Then, the range from the maximum value to the minimum value of the current I detected within that time is stored as a stored value (step S100). The predetermined time σ is set as a time sufficient to detect the maximum peak and the minimum peak of the current I due to noise or the like.

  After storing the stored value normally, it is determined whether the disconnection detection execution condition is satisfied (step S110). In order for the disconnection detection execution condition to be satisfied, the operations of the V-phase current sensor 42V and the W-phase current sensor 42W are normal, and the current command amplitude is greater than (the maximum value of the stored value | + the predetermined value B). Need to grow. When this execution condition is satisfied, the control device 40 continuously executes the disconnection determination while a current flows through the motor generator 10. The predetermined value B is set as a value that allows the current I flowing through the motor generator 10 to exceed a determination range η for performing a disconnection determination described later.

  Whether or not the current sensors 42V and 42W are normal is determined based on whether each output of the current sensors 42V and 42W is within a predetermined range θ when the switching elements 23 to 28 are turned off and the power supply to the motor generator 10 is shut off. If it does not fit, it is judged normal, and if not, it is judged abnormal. The predetermined range θ is a range in consideration of the current I detected when no current flows through the motor generator 10. Also, when the current I detected by the current sensors 42V and 42W is always kept at the upper limit value or the lower limit value, it is determined that the current sensor has an abnormality. Alternatively, there is a large difference in sensor characteristics, such as two W-phase current sensors 42 (two V-phase current sensors 42V) having greatly different detected current values or greatly different slopes of detected currents. The case is also determined as abnormal.

  When it is determined that the current sensors 42V and 42W are abnormal, the current I flowing through the motor generator 10 cannot be detected normally, so that the disconnection determination cannot be performed. When current command amplitude is smaller than (maximum value of | stored value | + predetermined value B), current I supplied to motor generator 10 cannot exceed determination range η. Also in this case, since the current I supplied to the motor generator 10 falls within the determination range η, the disconnection determination cannot be performed normally.

  Therefore, when at least one of the two disconnection detection execution conditions is not satisfied, the disconnection detection execution condition is not satisfied, and the process is terminated without executing the disconnection determination as it is (step S110: NO). When the two disconnection detection execution conditions are both satisfied, the process proceeds to the next step (step S110: YES).

  The current I flowing from the inverter 20 to the motor generator 10 is detected by the current sensors 42V and 42W (step 120). As described above, one ends of the internal wirings 52A to 52C are connected to each other at a neutral point. For this reason, it is possible to detect that no current flows by the current sensor 42V or the current sensor 42W, regardless of where the wirings 50A to 50C and the internal wirings 52A to 52C are disconnected.

  It is determined whether the detected current I is within the determination range η shown in FIG. 3 (step 130). At this time, the determination range η for determining disconnection is defined as (minimum stored value−predetermined positive value A) to (maximum stored value + predetermined positive value A). The predetermined value A is set as a magnitude that cannot exceed the determination range η for performing the disconnection determination even if the current I when the motor generator 10 is not energized increases due to noise.

  The current I when disconnected is assumed to have a waveform similar to the current I when no current flows through the motor with the switching elements 23 to 28 turned off. Therefore, if the detected current I is not within the determination range η (step S130: NO), the three-phase wiring 50 connecting the inverter 20 and the motor generator 10 or the internal wiring 52 of the motor generator 10 is disconnected. It determines with having not carried out, and complete | finishes disconnection determination (step S150). On the other hand, if the detected current I exceeds the abnormality confirmation time β and falls within the determination range η (step S130: YES), the three-phase wiring 50 connecting the inverter 20 and the motor generator 10 or the motor generator 10 It is determined that the internal wiring 52 is disconnected, and the disconnection determination is terminated (step S140). At this time, the abnormality confirmation time β has a margin so that it is not erroneously determined to be disconnected when the alternating current I flowing when the motor generator 10 that is not disconnected is changed including the value of the determination range η. Is set.

  Next, the operation of the motor control system will be described with reference to FIG.

  In FIG. 3, “IG-ON” represents the start state of the motor control system as high / low. “Motor energization” indicates whether or not current is flowing through the motor generator 10, and “Current value learning” indicates storage execution of the current I flowing through the motor generator 10 by the control device 40 as high / low. The “motor system state” represents at what timing the internal wiring 52 of the motor generator 10 or the three-phase wiring 50 (corresponding to the phase wiring) connecting the inverter 20 and the motor generator 10 is disconnected. “Motor current” indicates the value of the current I flowing from the inverter 20 to the motor generator 10, and “Current command amplitude” indicates the command value of the amplitude of the current I flowing through the motor generator 10. The “execution condition” is an execution condition for performing disconnection determination, and represents whether or not the execution condition is satisfied. The “disconnection determination time” represents the length of time determined to be disconnected, and the “failure diagnosis result” represents the internal wiring 52 of the motor generator 10 or the three-phase wiring 50 connecting the inverter 20 and the motor generator 10. This indicates the timing at which it is determined that is disconnected.

  When the start request signal IG-ON switches from low to high (see time t1), energization of the inverter 20 is started in the motor control system. Then, immediately before the AC power is supplied from inverter 20 to motor generator 10, switching devices 23 to 28 are controlled to be turned off by control device 40. At this time, although the current does not flow from the inverter 20 to the motor generator 10, the current I is slightly detected. This is due to noise such as electrical noise and mechanical noise. The control device 40 continues to detect the current I for a predetermined time σ with respect to the fluctuation of the current I caused by noise, and stores the range from the maximum value to the minimum value of the detected current I as a stored value (time t2-3). reference).

  Then, control device 40 starts energization of motor generator 10 from inverter 20 (see time t4). Then, it is determined whether or not the current sensors 42V and 42W are normal, and when the current sensor amplitude is normal and the current command amplitude is larger than (the maximum value of || stored value | + the predetermined value B), the disconnection determination condition is satisfied ( Time t5). Thereafter, the control device 40 continuously performs the disconnection determination.

  If the current I flowing through the motor generator 10 is within the determination range η during the disconnection determination, the “disconnection determination time” increases. However, if this “disconnection determination time” is within the abnormality confirmation time β, it is determined that the disconnection has not occurred (see times t5 to t6). The current I when disconnected is assumed to have a waveform similar to the current I when no current flows through the motor with the switching elements 23 to 28 turned off. For this reason, the current I at the time of the disconnection continues to be within the determination range η. On the other hand, when the “disconnection determination time” becomes longer than the abnormality confirmation time β, the control device 40 determines that the disconnection occurs (see time t7).

  With the above configuration, the disconnection determination device according to the present embodiment has the following effects.

  The current I detected when the motor generator 10 is not energized is stored as a stored value by the control device 40. Based on a comparison between the current I detected during energization and the stored value, the control device 40 determines whether the three-phase wiring 50 connecting the inverter 20 and the motor generator 10 or the internal wiring 52 of the motor generator 10 is disconnected. For this reason, the influence of noise and product tolerance can be considered as a stored value, and erroneous determination of disconnection can be suppressed. Further, by using the stored value, it is not necessary to excessively increase the disconnection determination value, and it is possible to suppress a reduction in the drive region of the motor generator 10 that can determine disconnection.

  When the position information of the shift lever 35 is the N range or the P range, the storage means stores the current during energization flowing through the AC motor. More specifically, power supply to the inverter 20 is started, and before the AC power is supplied from the inverter 20 to the motor generator 10, the current I flowing through the motor generator 10 is stored by the control device 40. In this case, since the switching elements 23 to 28 of the inverter 20 are controlled to be off, the control device 40 does not flow the current I through the circuit including the motor generator 10, and the control device 40 does not flow through the motor generator 10. I can be stored.

  Since the noise component of the current I flowing through the motor generator 10 immediately before traveling is stored, it is not necessary to estimate the noise component in advance. Therefore, fewer operation checks are required during shipping inspection.

  By storing the noise flowing in the motor generator 10 each time before traveling, the stored value can be made as small as possible. For this reason, since the determination range η for performing the disconnection determination is also narrowed, the execution frequency of the disconnection determination can be increased, and the safety can be improved.

  The control device 40 stores a range from the maximum value to the minimum value of the current I detected by the current sensors 42V and 42W when the motor generator 10 is not energized as a stored value. As a result, the minimum value is stored from the maximum value of the current I flowing through the motor generator 10 when no power is supplied. For this reason, the range memorize | stored as a memorize | stored value is a range reflecting the largest noise, and it can reduce the erroneous determination of a disconnection as much as possible.

  According to the present embodiment, the control device 40 performs three-phase operation on the condition that the amplitude of the command value of the current I energized to the motor generator 10 is larger than (the maximum value of the absolute value of the stored value + the predetermined value B). The disconnection of the wiring 50 or the internal wiring 52 of the motor generator 10 is detected. For this reason, the disconnection determination can be performed when the current I exceeding the determination range η flows to the motor generator 10.

  When the current I detected by the current sensors 42V and 42W when the motor generator 10 is energized falls within the range from (maximum stored value + predetermined value A) to (minimum stored value−predetermined value A) In addition, the control device 40 determines that the three-phase wiring 50 connecting the inverter 20 and the motor generator 10 or the internal wiring 52 of the motor generator 10 is disconnected. Thereby, since the determination range η can be set wider than the stored value, it is possible to reduce the possibility of erroneous determination of disconnection.

  The current I detected by the current sensors 42V and 42W when the motor generator 10 is energized exceeds the range from (maximum stored value + predetermined value A) to (minimum stored value−predetermined value A). In this case, the control device 40 determines that the three-phase wiring 50 connecting the inverter 20 and the motor generator 10 or the internal wiring 52 of the motor generator 10 is not disconnected. Therefore, the determination range η can be made larger than the stored value. For this reason, for example, even if the current I detected by the current sensors 42V and 42W when energized to the motor generator 10 becomes larger than the stored value due to the influence of noise or the like, the possibility of erroneous determination that there is no disconnection is reduced. It becomes possible.

  In addition, the said embodiment can also be changed and implemented as follows.

  The current I is stored immediately before the current is supplied to the motor generator 10. With respect to this, if the predetermined condition is satisfied, the control device 40 controls the switching elements 23 to 28 to be turned off while the motor generator 10 is rotating, that is, while the vehicle is running. May be stored. At this time, if the back electromotive voltage generated in the motor generator 10 is larger than the voltage applied to the capacitor 22 provided in the inverter 20, a current may flow to a circuit including the motor generator 10 through the free wheel diodes 29 to 34. is there. In this case, the current I flowing through the motor generator 10 cannot be appropriately stored as a stored value. Therefore, the predetermined condition is when the counter electromotive voltage generated in the motor generator 10 is lower than the voltage applied to the capacitor 22, and at that time, the control device 40 stores the minimum value from the maximum value of the current I. To do. Therefore, the control device 40 can store the maximum value and the minimum value of the motor current I not only when the vehicle is stopped but also when the vehicle is traveling. Incidentally, this predetermined condition is also satisfied immediately after the system is started in the above embodiment.

  In the disconnection determination according to the present embodiment, detection of the current I flowing through the motor generator 10 is performed by the current sensors 42V and 42W. With respect to this, only one of the current sensors 42V and 42W may detect the current I flowing through the motor generator 10. Even in this case, it is possible to determine that any of the internal wiring 52 of the motor generator 10 or the wiring 50 connecting the motor generator 10 and the inverter 20 is disconnected.

  The control device 40 stores the current I flowing through the motor generator 10. In this regard, even if the control device 40 does not store the current I flowing through the motor generator 10, another unit or storage device may store it. For example, the current I may be stored in, for example, an Eng-ECU that controls the driving of the internal combustion engine, an HV-ECU that distributes the required driving force to the Eng-ECU and the control device 40, a separate storage device, or the like. Even in this case, the disconnection determination can be performed as usual. However, in this case, it is necessary to transmit the detection values detected by the current sensors 42V and 42W from the control device 40.

  In the present embodiment, the range from the maximum value to the minimum value of the current I at the time of non-energization flowing through the motor generator 10 by the control device 40 is stored as a stored value. In this regard, the stored value may be from the detected positive peak average to the negative peak average. In this case, since a plurality of peaks of the current I flowing through the motor generator 10 when not energized are averaged and stored, the maximum value of the positive peak and the minimum value of the negative peak with a low peak frequency are omitted, and the peak frequency is high. The range can be stored as a stored value. For this reason, the range stored as the stored value can be minimized.

  In the present embodiment, the current I flowing through the motor generator 10 is detected by the V-phase current sensor 42V and the W-phase current sensor 42W provided in the wirings 50B and 50C, respectively. With respect to this, a current sensor may be provided in the internal wiring 52 of the motor generator 10 to detect the current I flowing through the motor generator 10. Even in this case, the disconnection determination can be performed as usual.

  As one of the execution conditions for the disconnection determination, the current command amplitude for energizing the motor generator 10 is larger than (the maximum value of the | stored value | + the predetermined value B). In this regard, the current command amplitude may be larger than (| the maximum value of the stored value | × the coefficient ω). In this case, coefficient ω is 1 or more, and is set such that current I flowing through motor generator 10 exceeds determination range η for determining disconnection. For this reason, the disconnection determination can be performed when the current I exceeding the determination range η flows to the motor generator 10.

  In the present embodiment, the determination range η for determining disconnection is from (minimum stored value−predetermined positive value A) to (maximum stored value + predetermined positive value A). In this regard, the determination range η may be from {− (minimum stored value × coefficient γ)} to (maximum stored value × coefficient γ). In this case, the coefficient γ is 1 or more, and is set so that the determination range η cannot be exceeded even if the current I flowing through the motor generator 10 when not energized increases due to noise. As a result, the range for determining the disconnection can be made wider than the stored value, so that it is possible to reduce the possibility of erroneously determining the disconnection even if the current peak increases due to the influence of noise or the like. .

  On the other hand, when the current I detected by the current sensors 42V and 42W when the motor generator 10 is energized exceeds the range of (memory value × coefficient γ of 1 or more), the internal wiring 52 of the motor generator 10 or the AC power It is determined that the wiring 50 for supplying is not disconnected. Therefore, the determination range η for determining the disconnection can be made larger than the stored value. For this reason, for example, even if the current detected by the current sensors 42V and 42W when energized to the motor generator 10 becomes larger than the stored value due to the influence of noise or the like, the possibility of misjudging that it is not disconnected is reduced. Is possible.

  In the present embodiment, the determination range η for determining disconnection is from (minimum stored value−predetermined positive value A) to (maximum stored value + predetermined positive value A). In this regard, either the maximum value of the stored value or the minimum value of the stored value may be compared with the current I flowing through the motor generator 10. In this case, if the current I is smaller than the maximum stored value to be compared or the current I is larger than the minimum stored value, the internal wiring 52 of the motor generator 10 or the inverter 20 and the motor generator 10 are connected. It is determined that the wiring 50 is disconnected. According to this disconnection determination, the current I flowing when the motor generator 10 is de-energized may be stored only in one of the maximum value and the minimum value, and the disconnection determination can be simplified accordingly. The load on 40 can be reduced.

  In the present embodiment, the control device 40 performs the storage of the current I that flows when the motor generator 10 is de-energized and the disconnection determination, but the control device 40 does not necessarily have to. For example, an Eng-ECU that performs drive control of the internal combustion engine may be substituted for it, or a new microcomputer may be provided for the engine. In addition, it is not necessary for one device to perform both storage and disconnection determination. For example, the control device 40 may perform storage, and an ECU that performs drive control of the motor generator 10 may perform disconnection determination. Even in this case, the disconnection determination in this embodiment can be performed normally. However, in this case, it is necessary to transmit the detection values detected by the current sensors 42V and 42W from the control device 40.

  In the present embodiment, two V-phase current sensors 42V and two W-phase current sensors 42W are provided on the wirings 50B and 50C, respectively, and have a two-phase, two-channel configuration. In this regard, one current sensor may be provided for each of the wirings 50A, 50B, and 50C to form a one-phase one-ch configuration. In this case, each current sensor may detect the current I flowing through the motor generator 10, or at least one of the three current sensors may be used to detect the current I. Even in this case, the disconnection determination according to the present embodiment can be performed normally.

  In the present embodiment, a three-phase motor is employed as the motor generator 10. However, not only a three-phase motor but also a four-phase motor may be used. Even in this case, the disconnection determination according to the present embodiment can be performed normally.

DESCRIPTION OF SYMBOLS 10 ... Motor generator, 40 ... Control apparatus, 42V, 42W ... Current sensor, 50 ... Wiring, 52 ... Internal wiring.

Claims (12)

Disconnection determination device (42V, 42W) for determining disconnection of phase wiring (50) for supplying AC power to AC motor (10) or internal wiring (52) of the AC motor to which AC power is supplied from the phase wiring 40), and
Current detection means (42V, 42W) for detecting a current flowing in the phase wiring or the internal wiring;
Storage means (40) for storing the current detected by the current detection means when the AC motor is not energized as a stored value;
Determination means for determining disconnection of the phase wiring or the internal wiring based on a comparison between the current detected by the current detection means at the time of energization of the AC motor and the stored value stored by the storage means. (40)
Bei to give a,
The AC power is supplied to the AC motor from an inverter (20) including a capacitor (22) for smoothing the output voltage and a plurality of switching elements (23 to 28).
Each of the switching elements is provided with a diode in parallel for flowing a current only in a direction opposite to a direction in which the current flows in the switching element.
The storage means stores the current detected by the current detection means when the AC motor is not energized when a back electromotive voltage generated in the AC motor is lower than a voltage applied to the capacitor. The disconnection determination device is not implemented when a back electromotive voltage generated in the AC motor is higher than a voltage applied to the capacitor . The storage means generates the storage of the current detected by the current detection means when the AC motor is de-energized from the voltage applied to the capacitor during rotation of the AC motor. The disconnection determination device according to claim 1, wherein the disconnection determination device is implemented when a counter electromotive voltage is low and is not performed when a counter electromotive voltage generated in the AC motor is higher than a voltage applied to the capacitor .   The storage means includes a capacitor (22) for smoothing an output voltage and a plurality of switching elements (23 to 28) for storing the current detected by the current detection means when the AC motor is not energized. The disconnection determination device according to claim 1 or 2, wherein power supply to the inverter (20) is started and before the AC power is supplied from the inverter to the AC motor. .   The storage means stores the current detected by the current detection means when the AC motor is not energized when the position information of the shift lever (35) is in the N range or the P range. The disconnection determination apparatus according to any one of claims 1 to 3.   5. The storage unit according to claim 1, wherein the storage unit stores a range from a maximum value to a minimum value of the current detected by the current detection unit when the AC motor is not energized as the storage value. Disconnection determination apparatus of any one of Claims.   The storage means stores a range from a positive peak average to a negative peak average of the current detected by the current detection means when the AC motor is not energized as the stored value. The disconnection determination apparatus according to any one of 1 to 4.   The determination means determines whether the internal wiring or the phase wiring is in a range where the current detected by the current detection means during energization of the AC motor is within a range of (the stored value × predetermined coefficient of 1 or more). The disconnection determination device according to claim 1, wherein the disconnection determination device determines that the disconnection has occurred.   When the current detected by the current detection unit exceeds the range of (the stored value × the predetermined coefficient equal to or greater than 1) when the AC motor is energized, the determination unit is configured to perform the internal wiring or the phase wiring. The disconnection determination device according to claim 7, wherein it is determined that the disconnection is not disconnected.   The determination means determines that the current detected by the current detection means when the AC motor is energized from (the maximum value of the stored value + a predetermined positive value) (the minimum value of the stored value−the predetermined value of the positive). 7. The disconnection determination device according to claim 1, wherein the internal wiring or the phase wiring is determined to be disconnected when it falls within the range up to ().   The determination means determines that the current detected by the current detection means when the AC motor is energized from (the maximum value of the stored value + the positive predetermined value) (the minimum value of the stored value−the positive predetermined value). 10. The disconnection determination device according to claim 9, wherein the internal wiring or the phase wiring is determined not to be disconnected when a range up to (value) is exceeded.   The determination means performs the disconnection determination on condition that an amplitude of a command value of a current to be supplied to the AC motor is larger than (| the maximum value of the stored value | × 1 or the predetermined coefficient equal to or greater than 1). The disconnection determination apparatus according to claim 7 or 8.   The determination means performs the disconnection determination on condition that an amplitude of a command value of a current to be supplied to the AC motor is larger than (| maximum value of the stored value | + the predetermined value positive). The disconnection determination apparatus according to claim 9 or 10, wherein the disconnection determination apparatus according to claim 9 or 10 is characterized.

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