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Method and system for compensating for time delays in positioning for controlling an electric motor

A technology of time delay and electric motor, which is applied in the direction of control system, control generator, vector control system, etc., and can solve the problems of motor inefficiency, time mismatch, imprecise control, etc.

Active Publication Date: 2016-03-16
DEERE & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In turn, the control signal generated by the inverter may not be time matched or synchronized with the rotor position, which will result in inefficient or imprecise control of the motor

Method used

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  • Method and system for compensating for time delays in positioning for controlling an electric motor
  • Method and system for compensating for time delays in positioning for controlling an electric motor
  • Method and system for compensating for time delays in positioning for controlling an electric motor

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Embodiment Construction

[0012] According to one embodiment, figure 1 A system for controlling an electric motor 117 (eg, an interior permanent magnet (IPM) motor) or other AC electric machine is disclosed. In one embodiment, other than the motor 117, the system may be referred to as an inverter or motor controller.

[0013] The system includes electronic modules, software modules, or both. In one embodiment, the motor controller includes an electronic data processing system 120 to support the storage, processing, or execution of software instructions for one or more software modules. Electronic data processing system 120 such as figure 1 shown by the dashed line in , and in figure 2 is shown in more detail.

[0014] Electronic data processing system 120 is connected to inverter circuit 188 . The inverter circuit 188 includes a semiconductor driver circuit that drives or controls switching semiconductors (eg, insulated gate bipolar transistors (IGBTs) or other power transistors) to output contro...

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PUM

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Abstract

A sensor detects position data for a rotor of the motor at a first time. A data processor receives the detected position data associated with a first time delay. A sensing circuit senses an analog current at the motor during a second time delay. An analog-to-digital converter converts the analog current to a digital current data during a third time delay. The fourth time delay is detected between actual current reading instant and position reading instant in a data processor. The digital phase current data is transformed into measured direct and quadrature axes control current data based on synchronization or temporal alignment of the position data with the actual measured analog phase current at the starting time by compensating the position data by a sum of the second time delay, the third time delay and the fourth time delay, where the first time delay is subtracted from the sum.

Description

[0001] This application claims priority under 35 U.S.C. 119(e) to U.S. Provisional Application No. 61 / 445,640, filed February 23, 2011, entitled "METHODSYSTEMFORCONTROLLINGANELECTRICMOTORWITHCOMPENSATIONFORTIMEDELAYINPOSITIONDETERMINATION." technical field [0002] The invention relates to a method and a system for controlling an electric motor with compensation for time delays in positioning. Background technique [0003] An electric motor may have a rotor and a stator with permanent magnets, such as an interior permanent magnet (IPM) motor or an IPM synchronous motor. According to some prior art position data may be delayed by electronic data processing or measurement circuitry which will create an error between the actual measured position and the position intended for use with the phase currents used for Park transformation. In turn, the control signals generated by the inverter may not be time matched or synchronized with the position of the rotor, which will result in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14
CPCH02P21/0085H02P21/14
Inventor 吴隆罗伯特·肖苏简·库桑巴
Owner DEERE & CO