JP2008104299A - Temperature protection control device and method for motor - Google Patents

Temperature protection control device and method for motor Download PDF

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JP2008104299A
JP2008104299A JP2006285137A JP2006285137A JP2008104299A JP 2008104299 A JP2008104299 A JP 2008104299A JP 2006285137 A JP2006285137 A JP 2006285137A JP 2006285137 A JP2006285137 A JP 2006285137A JP 2008104299 A JP2008104299 A JP 2008104299A
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motor
temperature
output torque
maximum output
predetermined
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JP4915206B2 (en
Inventor
Hirosuke Honma
Tadaaki Iiyama
洋佑 本間
忠明 飯山
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Nissan Motor Co Ltd
日産自動車株式会社
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Abstract

An object of the present invention is to suppress a temperature rise of a motor without stopping the motor.
When the motor temperature exceeds a first predetermined temperature Temp1, the maximum output torque of the motor is limited according to the motor temperature, and the motor temperature is a second predetermined temperature higher than the first predetermined temperature Temp1. When Temp2 is exceeded, the maximum output torque of the motor is set to a predetermined torque greater than 0 without depending on the motor temperature, and the drive of the motor is controlled so that the output torque of the motor is equal to or less than the maximum output torque.
[Selection] Figure 5

Description

  The present invention relates to an apparatus and a method for performing temperature protection control of a motor.

  2. Description of the Related Art Conventionally, a technique is known in which the temperature near the stator winding of a motor is detected, and when the detected temperature is equal to or higher than a predetermined temperature, the motor operation is stopped to suppress the temperature rise of the motor (Patent Document 1). reference).

JP-A-10-174276

  However, in the conventional technology, when the temperature in the vicinity of the stator winding is equal to or higher than a predetermined temperature, there is a problem that the motor operation is stopped even when the motor operation is necessary.

  When the motor temperature exceeds the first predetermined temperature, the motor temperature protection control device and the temperature protection control method according to the present invention limit the maximum output torque of the motor according to the motor temperature, and the motor temperature is the first temperature. When the second predetermined temperature higher than the predetermined temperature is exceeded, the maximum output torque of the motor is set to a predetermined torque greater than 0 without depending on the motor temperature, and the output torque of the motor is equal to or less than the maximum output torque. It controls the drive of the motor.

  According to the temperature protection control device and the temperature protection control method of the present invention, even when the temperature of the motor rises, the motor can be continuously operated.

-First embodiment-
FIG. 1 is a diagram illustrating a configuration of a temperature protection control device for a motor in the first embodiment. The motor temperature protection control device in the first embodiment includes a three-phase AC motor 1 (hereinafter referred to as AC motor 1 or simply motor 1), a controller 2, an inverter 3, a battery 4, A coil temperature sensor 5, a refrigerant temperature sensor 6, and a rotation speed sensor 7 are provided. This motor temperature protection control device is mounted and used, for example, in a hybrid vehicle or an electric vehicle.

  The AC motor 1 is a concentrated winding motor. FIG. 2 is a diagram illustrating a configuration of the AC motor 1. The AC motor 1 includes a stator 11 and a rotor 12 provided inside the stator 1. The stator core 13 constituting the stator 11 has a plurality of teeth 14 protruding in the inner circumferential direction. Each tooth is arranged at equal intervals on the same circumference, and a stator coil 15 is configured by winding a winding. The outside of the stator 11 is covered with a motor case 16.

  FIG. 3 is a cross-sectional view when the AC motor 1 shown in FIG. 2 is cut at the position AA. In the motor case 16, a refrigerant flow path 17 for supplying a refrigerant (for example, water) for cooling the motor 1 is provided. As shown in FIG. 3, the heat generated by the stator coil 15 is released to the refrigerant flowing in the refrigerant flow path 17 via the motor case 16.

  The coil temperature sensor 5 detects the temperature of any one of the plurality of stator coils 15 and outputs the detected temperature to the controller 2. The refrigerant temperature sensor 6 detects the temperature of the refrigerant flowing in the refrigerant flow path 17 and outputs it to the controller 2. The rotation speed sensor 7 detects the rotation speed of the motor 1 and outputs it to the controller 2.

  The DC power of the battery 4 is converted into AC power by the inverter 3 and supplied to the motor 1. As will be described later, the controller 2 determines the motor 1 based on the coil temperature detected by the coil temperature sensor 5, the refrigerant temperature detected by the refrigerant temperature sensor 6, and the motor rotational speed detected by the rotational speed sensor 7. Is set, and the inverter 3 is controlled so that the output torque of the motor 1 is equal to or lower than the upper limit value of the output torque.

  In the conventional motor control technique, the maximum output torque of the motor 1, that is, the maximum torque that can be output by the motor 1 is determined according to the rotation speed of the motor 1. Even in the motor temperature protection control apparatus according to the first embodiment, the maximum output torque of the motor 1 is determined in accordance with the rotational speed of the motor 1 in a region where the temperature of the motor 1 is not high.

  FIG. 4 is a diagram showing the relationship between the rotation speed of the motor 1 and the maximum output torque of the motor 1. The controller 3 holds data indicating the relationship between the rotational speed of the motor 1 and the maximum output torque as shown in FIG. 4, and the coil temperature detected by the coil temperature sensor 5 is a first predetermined temperature Temp1 described later. In the following cases, the maximum output torque of the motor 1 is determined according to the motor rotation speed detected by the rotation speed sensor 7.

  In the motor temperature protection control device according to the first embodiment, when the temperature of the stator coil 15 (motor 1) rises, the temperature of the stator coil 15 detected by the coil temperature sensor 5 in order to suppress further temperature rise. Accordingly, the value of the maximum output torque determined according to the rotation speed of the motor 1 is limited (reduced). FIG. 5 is a diagram showing the relationship between the temperature of the stator coil 15 and the maximum output torque of the motor 1. However, the vertical axis of FIG. 5 indicates the ratio (%) of the maximum output torque at the time of the limit to the maximum output torque determined according to the rotation speed of the motor 1. Therefore, if there is no limit, the value is 100%.

  As shown in FIG. 5, when the temperature of the stator coil 15 is equal to or lower than a first predetermined temperature Temp1 (for example, 150 ° C.), the maximum output torque determined according to the rotation speed of the motor 1 is not limited. When the temperature of the stator coil 15 exceeds the first predetermined temperature Temp1, the maximum output torque is limited according to the temperature of the stator coil 15, and the temperature of the stator coil 15 is set to the second predetermined temperature Temp2 (for example, 170 ° C. ) Exceeds the limit ratio. The value when the ratio of the restriction is made constant is C (0 <C <100) (%). In this case, the maximum output torque of the motor 1 is Trq0 × C, where Trq0 is the maximum output torque determined according to the rotation speed of the motor 1. In other words, when the temperature of the stator coil 15 exceeds the second predetermined temperature Temp2, the maximum output torque of the motor 1 is set to a predetermined torque (Trq0 × C) greater than 0 without depending on the temperature of the stator coil.

  The predetermined torque (Trq0 × C), that is, the constant value C is such that when the motor 1 is driven in a state where the temperature of the stator coil 15 is equal to the second predetermined temperature Temp2, the amount of heat generated by the stator coil 15 is reduced from the stator coil 15. A value that is less than the amount of heat (heat removal amount) that escapes to the refrigerant flowing through the refrigerant flow path 17 is determined in advance through experiments or the like. As a result, even when the motor 1 (stator coil) becomes high temperature, as long as the output of the motor 1 is operated within the range of Trq0 × C or less, the operation of the motor 1 is suppressed while suppressing further temperature rise of the stator coil 15. Can be continued.

  The amount of heat removed from the stator coil 15 to the refrigerant increases as the difference between the temperature of the stator coil 15 and the temperature of the refrigerant increases. That is, the higher the stator coil 15 is, the greater the amount of heat removed to the refrigerant. Therefore, when the motor 1 is driven in a state where the temperature of the stator coil 15 is equal to the second predetermined temperature Temp2, the constant value C is determined so that the amount of heat generated by the stator coil 15 is smaller than the amount of heat removed to the refrigerant. If so, the temperature of the stator coil 15 decreases as long as the operation of the motor 1 is performed within the range of Trq0 × C or less.

  Here, the amount of heat removed from the stator coil 15 to the refrigerant increases as the temperature of the refrigerant decreases, and decreases as the temperature of the refrigerant increases. Therefore, the constant value C is set according to the temperature of the refrigerant. FIG. 6 is a diagram illustrating an example of a constant value C set according to the temperature of the refrigerant. As shown in FIG. 6, the constant value C is set to a larger value when the refrigerant temperature is lower than when the refrigerant temperature is high, and the maximum output torque determined according to the number of revolutions of the motor 1 is limited. Reduce the amount. Thereby, when the temperature of a refrigerant | coolant is low, the driving | operation area | region of the motor 1 is expanded.

  In FIG. 6, only two values of the constant value C, ie, the case where the refrigerant temperature is low and the case where the refrigerant temperature is high are shown, but the value of the constant value C increases as the refrigerant temperature decreases. The constant value C is set to be smaller as the refrigerant temperature is higher. An appropriate constant value C with respect to the temperature of the refrigerant is obtained in advance by an experiment or the like.

  The constant value C is also set according to the rotational speed of the motor 1. FIG. 7 is a diagram illustrating the relationship between the rotation speed of the motor 1 and the maximum output torque of the motor 1. In FIG. 7, the dotted line represents the maximum output torque curve (see FIG. 4) when there is no limit, and the solid line represents the maximum output torque curve when the temperature of the stator coil exceeds the second predetermined temperature Temp2 (at the time of limitation). Maximum output torque curve). FIG. 8 is a diagram showing the relationship between the rotation speed of the motor 1 and the constant value C. As shown in FIG. As shown in FIG. 8, the constant value C is a high value when the operation region of the motor 1 is in the middle speed region. This is because the motor efficiency is the highest in the medium speed / medium torque region (see FIG. 4), so that the ratio of output to heat generation can be increased.

  FIG. 7 also shows a maximum output torque curve at the time of restriction according to the temperature of the refrigerant. As shown in FIG. 7, the maximum output torque at the time of restriction becomes larger when the refrigerant temperature is lower than when the refrigerant temperature is high. Accordingly, as shown in FIG. 8, the constant value C when the temperature of the refrigerant is low is also larger than when the temperature of the refrigerant is high.

  That is, in the motor temperature protection control device according to the first embodiment, when the temperature of the stator coil 15 is equal to or lower than the first predetermined temperature Temp1, the maximum output torque of the motor 1 according to the number of rotations of the motor 1. When the temperature of the stator coil 15 exceeds the first predetermined temperature Temp1, the temperature of the stator coil detected by the coil temperature sensor 5, the refrigerant temperature detected by the refrigerant temperature sensor 6, and the rotational speed sensor 7 are determined. Is set to the maximum output torque of the motor 1. However, when the temperature of the stator coil 15 exceeds the second predetermined temperature Temp2, the maximum output torque of the motor 1 is a value that does not depend on the temperature of the stator coil.

  Here, data indicating the relationship between the stator coil temperature, the refrigerant temperature, the motor rotation speed, and the maximum output torque of the motor 1 under the condition that the temperature of the stator coil 15 is higher than the first predetermined temperature Temp1 is stored in advance. It is obtained by conducting an experiment or the like, and the obtained data is stored in a memory (not shown) of the controller 2. The controller 2 stores the data stored in the memory, the temperature of the stator coil detected by the coil temperature sensor 5, the refrigerant temperature detected by the refrigerant temperature sensor 6, and the rotational speed detected by the rotational speed sensor 7. Is set to the maximum output torque of the motor 1 (maximum output torque at the time of limitation).

  FIG. 9 is a flowchart showing the contents of processing performed by the motor temperature protection control device according to the first embodiment. The controller 2 repeatedly performs the process starting from step S10 during the drive control of the motor 1.

  In step S10, it is determined whether or not the temperature of the stator coil 15 detected by the coil temperature sensor 5 is higher than a first predetermined temperature Temp1. If it is determined that the temperature of the stator coil 15 is equal to or lower than the first predetermined temperature Temp1, the process waits in step S10. In this case, the maximum output torque of the motor 1 is determined based on the motor rotational speed detected by the rotational speed sensor 7. On the other hand, if it is determined that the temperature of the stator coil is higher than the first predetermined temperature Temp1, the process proceeds to step S20.

  In step S20, the limitation of the maximum output torque of the motor 1 is started. As described above, the maximum output torque at the time of the limit is the data stored in the memory (not shown), the temperature of the stator coil detected by the coil temperature sensor 5, the refrigerant temperature detected by the refrigerant temperature sensor 6, and This is set based on the number of rotations detected by the rotation number sensor 7. Further, the drive of the motor 1 is controlled so that the output torque of the motor 1 is equal to or less than the set maximum output torque.

  In step S30 following step S20, it is determined whether the temperature of the stator coil detected by the coil temperature sensor 5 is higher than a second predetermined temperature Temp2. If it is determined that the temperature of the stator coil is equal to or lower than the second predetermined temperature Temp2, the process proceeds to step S70, and if it is determined that the temperature is higher than the second predetermined temperature Temp2, the process proceeds to step S40.

  In step S <b> 40, the maximum output torque of the motor 1 is set to a predetermined torque that does not depend on the temperature of the stator coil 15. This predetermined torque is a value determined based on the refrigerant temperature detected by the refrigerant temperature sensor 6 and the rotation speed detected by the rotation speed sensor 7 as described above.

  In step S50 following step S40, it is determined whether the temperature of the stator coil detected by the coil temperature sensor 5 is equal to or lower than a second predetermined temperature Temp2. If it is determined that the temperature of the stator coil is equal to or lower than the second predetermined temperature Temp2, the process proceeds to step S60. If it is determined that the temperature is higher than the second predetermined temperature Temp2, the process returns to step S40.

  In step S60, the data stored in a memory (not shown), the temperature of the stator coil detected by the coil temperature sensor 5, the refrigerant temperature detected by the refrigerant temperature sensor 6, and the rotation detected by the rotational speed sensor 7 are used. The maximum output torque of the motor 1 is set based on the number, and the process proceeds to step S70.

  In step S70, it is determined whether the temperature of the stator coil detected by the coil temperature sensor 5 is equal to or lower than a first predetermined temperature Temp1. If it is determined that the temperature of the stator coil is equal to or lower than the first predetermined temperature Temp1, the process proceeds to step S80, and if it is determined that the temperature is higher than the first predetermined temperature Temp1, the process returns to step S30. In step S80, the limitation on the maximum output torque of the motor 1 is finished, and the process returns to step S10.

  According to the motor temperature protection control apparatus in the first embodiment, when the temperature of the motor 1 exceeds the first predetermined temperature Temp1, the maximum output torque of the motor 1 is limited according to the motor temperature, and the motor When the temperature exceeds a second predetermined temperature Temp2 higher than the first predetermined temperature Temp1, the maximum output torque of the motor 1 is set to a predetermined torque greater than 0 without depending on the motor temperature, and the output torque of the motor 1 is The drive of the motor 1 is controlled so as to be equal to or less than the set maximum output torque. Thereby, even when the temperature of the motor 1 rises, the operation of the motor 1 can be continuously performed in the range where the output torque of the motor 1 is equal to or less than the maximum output torque without stopping the operation of the motor 1.

  Further, by setting the maximum output torque when the motor temperature exceeds the second predetermined temperature Temp2 to a predetermined torque without setting it to 0, the maximum output torque after the motor temperature exceeds the first predetermined temperature Temp1 is obtained. A sudden change can be prevented. Thereby, it is possible to prevent the vehicle behavior of a hybrid vehicle or an electric vehicle equipped with the motor temperature protection control device in the first embodiment from changing suddenly.

  Further, according to the temperature protection control device for the motor in the first embodiment, the predetermined torque is set based on the rotation speed of the motor 1 and the temperature of the refrigerant that cools the motor. An appropriate maximum output torque can be set according to the state of the refrigerant that cools the motor 1. In particular, since the predetermined torque is increased as the refrigerant temperature is lower, the use area of the motor 1 can be expanded when the refrigerant temperature is lower.

  Furthermore, according to the motor temperature protection control device in the first embodiment, the predetermined torque is set so that the amount of heat generated when the motor is driven is equal to or less than the amount of heat removed from the refrigerant. The motor 1 can be continuously operated while suppressing the above.

-Second Embodiment-
In the motor temperature protection control device according to the first embodiment, the maximum output torque of the motor 1 is limited according to the temperature of the stator coil 15 (motor 1). In the motor temperature protection control device according to the second embodiment, when the coil temperature sensor 5 that detects the temperature of the stator coil 15 fails, the output torque of the motor 1 is within the range of the predetermined torque or less. Continue driving. The failure of the coil temperature sensor 5 can be detected by a known method.

  When the coil temperature sensor 5 fails, the temperature of the stator coil cannot be detected, so that the maximum output torque of the motor 1 is limited according to the temperature of the stator coil as in the first embodiment. I can't. Therefore, when the coil temperature sensor 5 fails, the maximum output torque of the motor 1 is set to a predetermined torque, and the operation of the motor 1 is continued within a range where the output torque of the motor 1 is equal to or less than the predetermined torque. As in the first embodiment, the predetermined torque is a value at which the amount of heat generated when the motor is driven is equal to or less than the amount of heat removed from the refrigerant, and is set based on the temperature of the refrigerant and the rotation speed of the motor 1. .

  According to the motor temperature protection control device of the second embodiment, when the sensor that detects the temperature of the motor 1 fails, the maximum output torque of the motor is set to a predetermined torque, and the output torque of the motor 1 is predetermined. The motor 1 is continuously operated within the torque range or less. Thereby, even when the temperature sensor which detects the temperature of the motor 1 fails, the operation of the motor 1 can be continued. In particular, since the predetermined torque is set so that the amount of heat generated when the motor is driven is equal to or less than the amount of heat removed from the refrigerant, the motor 1 can be continuously operated while the temperature increase of the motor 1 is suppressed.

  The present invention is not limited to the first and second embodiments described above. For example, in the motor temperature protection control device according to the first embodiment, the constant value C is set based on the temperature of the refrigerant flowing in the refrigerant flow path 17 and the rotation speed of the motor 1. It is also possible to set based on either the temperature of the motor or the number of rotations of the motor 1.

  In the relationship between the stator coil temperature shown in FIG. 5 and the maximum output torque (%) of the motor 1, the coil temperature does not form a straight line between the first predetermined temperature Temp1 and the second predetermined temperature Temp2, It can also be a smooth curve.

  In the embodiment described above, the temperature of the stator coil 15 that generates heat is detected as the temperature of the motor 1, but other parts of the motor 1 may be detected, or the ambient temperature of the motor 1 may be detected. Alternatively, it may be substituted.

  Although the motor that is the target of temperature protection has been described as a three-phase AC concentrated winding motor, it can also be applied to other types of motors. In the above-described embodiment, the example in which the motor temperature protection control device is mounted and used in a hybrid vehicle or an electric vehicle has been described. However, the present invention can be applied to a fuel cell vehicle, or other than a vehicle. It can also be applied to the system.

  The correspondence between the constituent elements of the claims and the constituent elements of the first and second embodiments is as follows. That is, the coil temperature sensor 5 constitutes motor temperature detection means, the controller 2 constitutes maximum output torque limiting means and failure detection means, the refrigerant temperature sensor 6 constitutes refrigerant temperature detection means, and the rotation speed sensor 7 constitutes rotation speed detection means. To do. In addition, the above description is an example to the last, and when interpreting invention, it is not limited to the correspondence of the component of said embodiment and the component of this invention at all.

The figure which shows the structure of the temperature protection control apparatus of the motor in 1st Embodiment. Diagram showing configuration of AC motor Sectional drawing when the AC motor shown in FIG. 2 is cut at the position AA The figure which shows the relationship between the rotation speed of the motor and the maximum output torque of the motor The figure which shows the relationship between the temperature of the stator coil and the maximum output torque of the motor The figure which shows an example of the fixed value C set according to the temperature of a refrigerant | coolant The figure which shows the relationship between the rotation speed of the motor and the maximum output torque of the motor The figure which shows the relationship between the rotation speed of a motor, and the fixed value C The flowchart which shows the processing content performed by the temperature protection control apparatus of the motor in 1st Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Motor, 2 ... Controller, 3 ... Inverter, 4 ... Battery, 5 ... Coil temperature sensor, 6 ... Refrigerant temperature sensor, 7 ... Revolution sensor, 11 ... Stator, 12 ... Rotor, 13 ... Stator core, 14 ... Teeth, 15 ... Stator coil, 16 ... Motor case

Claims (8)

  1. Motor temperature detecting means for detecting the temperature of the motor (hereinafter referred to as motor temperature);
    Maximum output torque limiting means for limiting the maximum output torque of the motor according to the motor temperature when the motor temperature detected by the motor temperature detection means exceeds a first predetermined temperature;
    Motor control means for controlling the drive of the motor so that the output torque of the motor is equal to or less than the maximum output torque limited by the maximum output torque limiting means,
    When the motor temperature detected by the motor temperature detecting unit exceeds a second predetermined temperature higher than the first predetermined temperature, the maximum output torque limiting unit changes the maximum output torque of the motor to the motor temperature. A temperature protection control device for a motor, characterized by being set to a predetermined torque greater than 0 without depending on the motor.
  2. The temperature protection control device for a motor according to claim 1,
    Further comprising a refrigerant temperature detecting means for detecting a temperature of a refrigerant for cooling the motor (hereinafter referred to as a refrigerant temperature),
    The maximum output torque limiting means sets the predetermined torque based on the refrigerant temperature detected by the refrigerant temperature detection means.
  3. The temperature protection control device for a motor according to claim 2,
    The maximum output torque limiting means increases the predetermined torque as the refrigerant temperature detected by the refrigerant temperature detecting means is lower.
  4. The temperature protection control device for a motor according to claim 1,
    A rotation number detecting means for detecting the rotation number of the motor;
    The motor temperature protection control device according to claim 1, wherein the maximum output torque limiting means sets the predetermined torque on the basis of the rotational speed detected by the rotational speed detection means.
  5. In the temperature protection control apparatus of the motor of Claim 2 or Claim 3,
    The maximum output torque limiting means sets the predetermined torque based on the refrigerant temperature detected by the refrigerant temperature detecting means and the rotational speed detected by the rotational speed detecting means. Temperature protection control device.
  6. In the temperature protection control apparatus of the motor as described in any one of Claims 1-5,
    A failure detection means for detecting a failure of the motor temperature detection means;
    The maximum output torque limiting means sets the maximum output torque of the motor to the predetermined torque when a failure of the motor temperature detection means is detected by the failure detection means. Control device.
  7. In the temperature protection control apparatus of the motor as described in any one of Claims 1-6,
    The motor temperature protection control device according to claim 1, wherein the predetermined torque is a value at which a heat generation amount during driving of the motor is less than a heat removal amount.
  8.   When the motor temperature (hereinafter referred to as “motor temperature”) exceeds a first predetermined temperature, the maximum output torque of the motor is limited according to the motor temperature, and the motor temperature is higher than the first predetermined temperature. When a predetermined temperature of 2 is exceeded, the maximum output torque of the motor is set to a predetermined torque greater than 0 without depending on the motor temperature, and the output torque of the motor is equal to or less than the maximum output torque. A temperature protection control method for a motor, characterized by controlling the drive of the motor.
JP2006285137A 2006-10-19 2006-10-19 Apparatus and method for temperature protection control of motor Active JP4915206B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010004602A (en) * 2008-06-18 2010-01-07 Honda Motor Co Ltd Motor output limiter
CN101789752A (en) * 2009-01-23 2010-07-28 日本电产芝浦株式会社 Control device of electric motor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05122901A (en) * 1991-04-18 1993-05-18 Vickers Inc Electric motor driving in-line hydraulic system
JPH07312802A (en) * 1994-05-16 1995-11-28 Hitachi Automot Eng Co Ltd Drive control apparatus of motor-driven vehicle
JP2000115917A (en) * 1998-09-30 2000-04-21 Toyota Motor Corp Control equipment of motor
JP2000125599A (en) * 1998-08-12 2000-04-28 Hitachi Ltd Ac generator and vehicle using it
JP2003284375A (en) * 2002-03-20 2003-10-03 Toyoda Mach Works Ltd Motor temperature estimating apparatus and motor control device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05122901A (en) * 1991-04-18 1993-05-18 Vickers Inc Electric motor driving in-line hydraulic system
JPH07312802A (en) * 1994-05-16 1995-11-28 Hitachi Automot Eng Co Ltd Drive control apparatus of motor-driven vehicle
JP2000125599A (en) * 1998-08-12 2000-04-28 Hitachi Ltd Ac generator and vehicle using it
JP2000115917A (en) * 1998-09-30 2000-04-21 Toyota Motor Corp Control equipment of motor
JP2003284375A (en) * 2002-03-20 2003-10-03 Toyoda Mach Works Ltd Motor temperature estimating apparatus and motor control device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010004602A (en) * 2008-06-18 2010-01-07 Honda Motor Co Ltd Motor output limiter
CN101789752A (en) * 2009-01-23 2010-07-28 日本电产芝浦株式会社 Control device of electric motor

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