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Wheel diameter measuring instrument for electric vehicle

A wheel and trolley technology, applied in electromagnetic measuring devices, electric/magnetic diameter measurement, electrical devices, etc., can solve problems such as inapplicable wheel diameter estimation method and difficulty in realizing tram control

Inactive Publication Date: 2014-06-18
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] That is, in the electric car driven by the synchronous motor without speed sensor vector control, there is a problem that the conventional wheel diameter estimation method cannot be applied, and it is difficult to realize the same electric car control as when the induction motor is used.

Method used

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  • Wheel diameter measuring instrument for electric vehicle
  • Wheel diameter measuring instrument for electric vehicle
  • Wheel diameter measuring instrument for electric vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0054] Hereinafter, the present invention will be described in detail based on the drawings showing the embodiment.

[0055] figure 1 It is a configuration diagram showing the configuration of the wheel diameter measuring device of an electric vehicle according to Embodiment 1 of the present invention. figure 1 Among them, the power converter 1 converts the DC voltage supplied from the pantograph 6 into an AC voltage, and supplies it to the synchronous motor 2 . In the present embodiment, the synchronous motor 2 is a permanent magnet synchronous motor in which a magnetic field is formed by a permanent magnet attached to a rotor, but it is not limited thereto. The wheel diameter measurement device 3 is composed of a voltage detector 4 that detects the AC voltage of the power converter 1 and the synchronous motor 2 , and a calculation unit 5 that calculates the wheel diameter from the detected AC voltage.

[0056] The wheel 7b is a drive wheel connected to the synchronous moto...

Embodiment approach 2

[0118] The wheel diameter measuring device 3 of the second embodiment is the same as that of the first embodiment, and includes: a voltage detector 4 that detects the AC voltage of the power converter 1 and the synchronous motor 2; and a calculation unit 5 that calculates the wheel diameter from the detected AC voltage. (5a in Embodiment 2) differs from Embodiment 1 in that, in the calculation unit 5a, the velocity calculator performs second-order quadratic differentiation (that is, fourth-order differentiation). According to this, since the influence of the offset of the voltage detector is eliminated, an offset compensator is unnecessary.

[0119] In addition, the same part as Embodiment 1 is attached|subjected with the same code|symbol, and the description is abbreviate|omitted.

[0120] Figure 9 It is a structural diagram showing the structure of the calculating part 5a in Embodiment 2 of this invention.

[0121] In the calculation unit 5a of Embodiment 2, the line volt...

Embodiment approach 3

[0149] Figure 12 It is a configuration diagram showing the configuration of a wheel diameter measuring device according to Embodiment 3 of the present invention. In the third embodiment, the difference from the first embodiment is that the wheel diameter measurement device 3 includes two voltage detectors 4a, 4b for detecting the AC voltage of the power converter 1 and the synchronous motor 2; The calculation part 5b which calculates the wheel diameter from the AC voltage detected by these two voltage detectors 4a, 4b is comprised.

[0150] In addition, the same part as Embodiment 1 is attached|subjected with the same code|symbol, and the description is abbreviate|omitted.

[0151] like Figure 12 As shown, first, as in the first embodiment, during the coasting of the electric car with the power converter 1 stopped, the voltage detectors 4a and 4b detect UV generated by forming a magnetic field with the permanent magnet attached to the rotor of the synchronous motor 2. Bet...

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PUM

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Abstract

A wheel diameter measuring apparatus for measuring a wheel diameter of an electric vehicle of speed sensorless vector control to which a synchronous motor is applied is obtained. A wheel diameter measuring apparatus of an electric vehicle comprising a synchronous motor driven by an electric power converter for converting a DC voltage into an AC voltage comprises a voltage detector for detecting an AC voltage generated by a magnetic field of the synchronous motor during coasting of the electric vehicle in which the electric power converter stops, and a calculation part for calculating a wheel diameter of a wheel driven by the synchronous motor from an AC voltage detected by the voltage detector and speed information about the electric vehicle.

Description

technical field [0001] The present invention relates to a wheel diameter measuring device of an electric vehicle, and in particular to a wheel diameter measuring device for an electric vehicle used in a railway vehicle or an electric vehicle using a synchronous motor. Background technique [0002] The wheels of the electric train are worn out during running, and there is a slight diameter difference between the wheels. If the torque of the motor is constant, the apparent acceleration of the wheel with a smaller wheel diameter will increase. In order to stably control the electric train whose apparent acceleration and deceleration varies, conventionally, the diameter of the wheel is estimated from the rotation speed of each wheel, and correction is performed. (For example, refer to Patent Document 1) [0003] On the other hand, from the viewpoint of miniaturization, improvement of reliability, and maintainability, in recent years, in the speed sensorless vector control used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B61K9/12G01B7/12H02P21/00H02P27/04B60L9/12B60L3/00H02P23/16H02P25/022
CPCG01B7/125B60L3/12B61L15/0081Y02T10/643B60L15/025B61K9/12B60L2200/26B60L2220/14Y02T10/64
Inventor 河野雅树北中英俊
Owner MITSUBISHI ELECTRIC CORP