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System and method for reducing speed ripple of drive motor of electric vehicle

A technology for driving electric motors and electric vehicles, applied in electric vehicles, torque ripple control, AC motor control, etc. Cost reduction, torque ripple reduction, and current ripple reduction effects

Active Publication Date: 2016-10-26
HYUNDAI MOTOR CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

like figure 2 As shown in , the peak value of the excitation input signal of the resolver 10 is synchronized with the switching frequency of the inverter, and noise is generated in the excitation input signal and the output voltage signal, thereby causing excessive rotational speed ripple
Excessive speed pulsation can lead to noise, vibration and harshness (NVH) deterioration, reduced gas mileage due to reduced drive motor efficiency due to current control instability, and durability deterioration due to vehicle vibration , resulting in frequent parts replacement and increased after-sales service costs

Method used

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  • System and method for reducing speed ripple of drive motor of electric vehicle
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  • System and method for reducing speed ripple of drive motor of electric vehicle

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Embodiment Construction

[0036] In the following detailed description, only certain exemplary embodiments of the present invention are simply shown and described in an exemplary manner. As those skilled in the art should realize, the described exemplary embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be illustrative rather than restrictive in nature. The same reference numerals refer to the same elements throughout the specification.

[0037] The terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used herein, the singular forms "a", "an", and "the" are also intended to include plural forms, unless the context clearly dictates otherwise. It should also be understood that the terms "including" and / or "including" used in the specification refer to the presence of the described features, ...

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Abstract

A system and method for reducing drive motor speed ripple of an electric vehicle are provided. The system includes an inverter that converts DC power supplied from a battery to AC power and supplies the AC power to the drive motor by inverter switching. A resolver is configured to detect a speed of the drive motor and a position of a rotor, a signal generator includes a microcontroller that is configured to generate a square wave signal. An integrator is configured to convert the square wave to a sine wave, and apply a sine-wave excitation input signal to the resolver. Furthermore, a motor controller is configured to adjust the frequency of the excitation input signal to prevent the inverter switching frequency of the inverter and the peaks of an output voltage signal sampled for speed calculation from overlapping.

Description

[0001] Cross reference of related applications [0002] This application claims the priority and rights of Korean Patent Application No. 10-2015-0054024 filed with the Korean Intellectual Property Office on April 16, 2015, the entire content of which is incorporated herein by reference. Technical field [0003] The present invention relates to a system and method for reducing the rotation speed pulsation of a drive motor of an electric vehicle, and more particularly to preventing the peak value of an excitation voltage signal input to a resolver from overlapping with the inverter switching time, so as to reduce the The speed of the drive motor is pulsating. Background technique [0004] Recently, there has been a growing need for environmentally friendly vehicles, which meet the demands of higher gasoline mileage in vehicles and strict exhaust regulations in the global market. Possible solutions to this situation include the development of hybrid electric vehicles (HEV), plug-in hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/10
CPCH02P6/16B60L50/51H02P27/06Y02T10/72Y02T10/70
Inventor 林在相卢正元姜求培金永云
Owner HYUNDAI MOTOR CO LTD
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