Electric motor stator winding temperature estimation systems and methods

A technology for electric motors and stator windings, applied in the direction of thermometers, electric components, thermometers, etc., can solve problems such as inaccurate assumptions and not easy to use

Inactive Publication Date: 2011-11-23
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in many cases information about such motor geometry or thermal or electrical properties may not be readily available and the assumptions made can lead to inaccurate
Other sensorless stator winding temperature estimation techniques have been developed that work well for zero or low speed temperature estimation (eg below 75rpm); however, these techniques may not produce accurate results at higher motor speeds

Method used

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  • Electric motor stator winding temperature estimation systems and methods
  • Electric motor stator winding temperature estimation systems and methods
  • Electric motor stator winding temperature estimation systems and methods

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Embodiment Construction

[0060] 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. Any embodiment described herein which is exemplary is not necessarily to be construed as preferred or advantageous over other embodiments, and is merely used as example, illustration or illustration. All of the embodiments described in this detailed description are provided to enable those skilled in the art to make or use the exemplary embodiments of the invention, and not to limit the scope of the invention, which is defined by the claims. Furthermore, there is no intention to be bound by any expressed or implied theory presented in the preceding technical field, background, brief summary or the following detailed description.

[0061] Exemplary embodiments discussed herein relate to methods and systems for estimating stator winding temperature in an electric motor. The disclosed methods and systems may be implement...

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Abstract

An electric motor system includes an electric motor comprising a stator with windings and a rotor configured to operate at a motor speed; a cooling system comprising coolant configured to cool the rotor and the stator, the coolant having a coolant flow rate and a coolant temperature; an inverter module coupled to the electric motor and configured to provide current to the windings based on inverter control signals; a current regulated torque controller coupled to the inverter module and configured to generate the inverter control signals in response to a derated torque command; and a temperature estimation controller coupled to the current regulated torque controller and configured to generate the derated torque command based on an initial torque command and an estimated stator winding temperature. The temperature estimation controller is configured to estimate the estimated stator winding temperature based on the motor speed and the coolant flow rate.

Description

technical field [0001] The present invention relates generally to electric motor systems, and more particularly to methods and systems for estimating the temperature of stator windings in electric motors. Background technique [0002] A hybrid electric vehicle (HEV) typically includes an alternating current (AC) electric motor driven by a direct current (DC) power source, such as a battery. The stator windings of the electric motor may be coupled to a power inverter module that performs a fast switching function to convert DC power to AC power to drive the electric motor, which in turn drives the shaft of the HEV drivetrain. [0003] The temperature of the motor stator windings is an important parameter and can be used for various purposes. For example, stator winding temperature may be an input in various motor control algorithms, certain algorithms using stator resistance as a control variable. Additionally, the stator winding temperature can also be used to detect high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K11/00G01K13/00G01K7/02
CPCG01K13/08G01K7/42H02K11/001H02P29/0055H02K11/20H02P29/64
Inventor C-C.叶S.E.舒尔茨
Owner GM GLOBAL TECH OPERATIONS LLC
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