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Methods and systems for induction motor control

A technology for induction motors and control signals, applied in control systems, vector control systems, AC motor control, etc., can solve problems such as difficult decoupling, loss of torque linearity, and inability to properly maintain machine flux levels

Active Publication Date: 2011-11-23
GM GLOBAL TECH OPERATIONS LLC
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Problems solved by technology

[0003] However, if the parameters used in the IFOC differ from the actual parameters in the induction machine, the desired machine flux levels cannot be properly maintained
Also, since the desired torque is estimated based on actual parameters, torque linearity may also be lost
For example, if you use less than ideal rotor resistance values ​​in your calculations, it will be difficult to properly maintain the decoupling between flux and torque

Method used

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  • Methods and systems for induction motor control
  • Methods and systems for induction motor control
  • Methods and systems for induction motor control

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Embodiment Construction

[0068] The following detailed description is merely exemplary in nature and is not intended to limit the invention or the application and uses of the invention. Furthermore, there is no intention to be bound by any theory presented in the preceding background or the following detailed description.

[0069] Broadly, the exemplary embodiments disclosed herein provide improved induction motor control. Specifically, the example systems and methods provide an improved estimate of rotor temperature, which in turn provides an improved estimate of rotor resistance. For example, the rotor temperature can be generated by a thermal model using the estimated rotor current and the temperature of the coolant or stator to provide a more accurate estimate, especially at low torque conditions. The estimated rotor resistance is then used as input to the IFOC module to provide improved operation of the induction motor.

[0070] figure 1 is a functional block diagram of an induction motor syst...

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Abstract

A method is provided for controlling an induction motor having a rotor. The method includes receiving a torque command; comparing the torque command to a threshold torque value; generating, with a first estimation module, a first estimated rotor resistance when the torque command is less than or equal to the threshold torque value; generating, with a second estimation module, a second estimated rotor resistance when the torque command is greater than the threshold torque value; and generating control signals for the induction motor based on the first estimated rotor resistance or the second estimated rotor resistance.

Description

Technical field [0001] The invention generally involves the field of induction machines, and more specific, involves methods and systems for controlling induction motors. Background technique [0002] Indirect field orientation control (IFOC) is widely used for inductive machines, including induction motors of vehicles.For example, IFOC is used for traction applications controlled by three -phase induction motor control in some vehicles.IFOC will be valuable tools.For example, if a specific parameter is known, ifoC will simplify the dynamic dynamics of the complex dynamics of the induction motor.This method allows independent control of the magnetic flux and torque of the motor. [0003] However, if the parameters used in IFOC are different from the actual parameters in the inductive machine, the expected machine magnetic flux level cannot be appropriately maintained.In addition, because of the actual parameter estimated torque, torque linear may also be lost.For example, if you ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P25/02
CPCH02P21/145H02P21/16
Inventor M.坎贝尔B.H.裴M.佩里西克Y.C.森
Owner GM GLOBAL TECH OPERATIONS LLC
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