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Inverter and its control method

An inverter and control unit technology, applied in control systems, control drives, control devices, etc., can solve the problems of high current consumption and difficulty in generating the maximum torque of induction motors

Inactive Publication Date: 2017-04-12
LSIS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, since a typical inverter fixes the D-axis current and changes only the Q-axis current when controlling the torque of the induction motor, it is difficult to generate the maximum torque of the induction motor
[0005] Also, since a typical inverter fixes the D-axis current and only changes the Q-axis current to produce the same torque, there is a limitation of high current consumption

Method used

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  • Inverter and its control method
  • Inverter and its control method
  • Inverter and its control method

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Embodiment Construction

[0015] Some embodiments will be described in detail below with reference to the accompanying drawings. In the following description, since suffixes 'module' and 'unit' for components are given and interchangeable for easy understanding of the present disclosure, they do not have different meanings and functions.

[0016] In the following description, the motor 200 may be an induction motor, a type of alternating current (AC) motor, but is not necessarily limited to an AC motor.

[0017] Also, hereinafter, the D axis may be a direct axis and the Q axis may be an orthogonal axis. Also, hereinafter, the D-axis current may be a direct-axis current and the Q-axis current may be a quadrature-axis current.

[0018] figure 1 is a block diagram of an inverter according to an embodiment.

[0019] refer to figure 1 , the inverter 100 may control the motor 200 . The inverter 100 and the motor 200 according to the embodiment may be applied to a neighborhood electric vehicle (NEV) usin...

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Abstract

The invention provides an inverter. The inverter includes: a current supply unit that supplies a first shaft current and a second shaft current to an induction motor; a revolutions per minute (RPM) measurement unit that measures the RPM of the induction motor; and a control unit , which varies the second shaft current according to the measured RPM.

Description

technical field [0001] The present disclosure relates to an inverter as a core component of an electric vehicle, and more particularly, to increasing a maximum torque of an induction motor and reducing energy consumption when the inverter controls the induction motor. Background technique [0002] An induction motor is a typical example of an alternating current (AC) motor. The induction motor can generate torque and turn a load in response to slippage when a current is induced at the rotor of the conductor due to the rotating field formed by the stator. Induction motors can be roughly classified into single-phase induction motors and three-phase induction motors according to the type of input AC power supply. [0003] In recent years, induction motors are frequently applied to electric vehicles. An induction motor applied to an electric vehicle can be driven by vector control. In this case, the inverter of the electric vehicle controls the torque of the induction motor t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/06
CPCB60L15/02B60L2210/40B60L2220/12B60L2240/421B60L2240/423B60L2240/429B60L2250/26H02P21/06H02P23/14H02P21/22Y02T10/64Y02T10/72B60L15/20H02M7/48H02P27/06
Inventor 张炳云梁千锡张宰熏郑重基李铣祐
Owner LSIS CO LTD