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Control device for motor drive system and vehicle equipped with the control device

A motor drive and control device technology, applied in the field of motors, to achieve the effect of improving efficiency

Active Publication Date: 2014-10-15
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in such a case, when the motor rotates at a high speed, there is a possibility that the induced voltage (counter electromotive force) of the motor generated by the magnet is greater than the input voltage of the inverter driving the motor

Method used

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  • Control device for motor drive system and vehicle equipped with the control device
  • Control device for motor drive system and vehicle equipped with the control device
  • Control device for motor drive system and vehicle equipped with the control device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0101] In such a motor drive system, in order to increase the rotational speed or output of AC motor MG1 as described above, it is necessary to increase system voltage VH. However, the system voltage VH cannot be set arbitrarily high, and is basically limited by the withstand voltage (withstand voltage, withstand voltage) of devices such as converters and / or converters.

[0102] Figure 4 and image 3 Similarly, it is a graph showing the relationship between the rotational speed MRN1 of the AC motor MG1 and the torque command value TR. exist Figure 4 In , the curve W2 shows the critical value at which the system voltage VH becomes the maximum value.

[0103] That is, the low rotation speed side or low output side of the curve W2 is a region where the system voltage VH is variable, and in this region, the above-mentioned PWM control (sine wave PWM control and overmodulation PWM control) can control the voltage applied to the motor. Size to get the desired speed and output ...

Embodiment approach 2

[0139] In Embodiment 1, a method of increasing the voltage boost command value by mitigating the amount of voltage variation due to control variation with respect to the maximum value Vdc of the system voltage VH in the case of a low torque command, so that The field weakening control area is moved to the high speed side to improve efficiency.

[0140] In Embodiment 2, the following method will be described. Furthermore, by considering the magnitude of the current flowing through the inverter and the converter, the amount of voltage variation due to the switching surge generated when the inverter and the converter perform switching operations will be described. , to increase the boost command value, thereby further improving efficiency.

[0141] Figure 13 and Figure 6 and Figure 7 It is also a graph showing the breakdown voltage of the inverter and switching elements included in the converter. In the second embodiment, the maximum value Vdc of the system voltage VH is m...

Embodiment approach 3

[0151] In Embodiment 1 and Embodiment 2, the method of mitigating the maximum value Vdc of the system voltage VH against the amount of voltage variation due to control fluctuations and switching surges in the case of a low torque command, Increase boost command value.

[0152] In Embodiment 3, a method of stopping the switching operation without changing the system voltage VH by taking advantage of the fact that the current flowing through the AC motor is very small in a state where the torque command value is substantially zero is described. limits.

[0153] Figure 17 is a diagram for explaining the outline of Embodiment 3, and is the same as that in Embodiment 1 and Embodiment 2 Figure 7 and Figure 13 Similarly, a graph of the withstand voltage of the inverter and switching elements included in the inverter is shown.

[0154] refer to Figure 17 , in Embodiment 1 and Embodiment 2, although the voltage fluctuation ΔV1 caused by the control fluctuation and the voltage ...

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Abstract

A control device (200) for a motor drive system (100) comprising an alternating current motor (MG1) with magnets in a rotor, a converter (120) and an inverter (130), the control device being based on A torque command value of an AC motor (MG1) generates a boost command value for a converter (120). The control device (200) determines whether or not to execute field weakening control for weakening magnets supplied from the inverter (130) to the AC motor (MG1) based on a boost command value and a driving state of the AC motor (MG1). The direction of the force is controlled by the current increase. Furthermore, the control device (200) further increases the generated boost command value when the field weakening control should be executed and the absolute value of the torque command value is smaller than a threshold value. In this way, the amount of field-weakening current can be reduced, and thus the efficiency of the motor drive system (100) can be improved.

Description

technical field [0001] The present invention relates to a motor drive. In this embodiment, an IGBT (Insulated Gate Bipolar Transistor: Insulated Gate Bipolar Transistor), a MOS (Metal Oxide Semiconductor: Metal Oxide Semiconductor) transistor for power, or a power transistor can be used as a switching element. Use bipolar transistors, etc. Anti-parallel diodes D1, D2 are disposed opposite to switching elements Q1, Q2. Reactor L1 is connected between a connection node of switching elements Q1 and Q2 and power line PL1 . In addition, the capacitor C2 is connected between the power line HPL and the ground line NL1. [0002] A system control device and a vehicle equipped with the control device, more specifically, relate to motor drive control for reducing loss in a motor drive system capable of field weakening control. Background technique [0003] In recent years, as an environment-friendly vehicle, a vehicle equipped with an electric storage device (for example, a secondar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/02H02P6/08B60L9/18H02M3/155H02M7/48H02P6/17H02P6/28H02P21/22H02P23/30H02P25/026H02P27/06H02P27/08
CPCY02T10/7275H02P21/0089B60L15/20Y02T10/643Y02T10/644H02P23/009H02P2201/07B60L2220/14B60L15/08H02P23/004B60L15/2045H02P23/30Y02T10/64Y02T10/72
Inventor 冈村贤树高松直义
Owner DENSO CORP
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