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Measurement for current change rate in switch reluctance motor

A technology of current change rate and switched reluctance drive, which is applied in the direction of motor generator testing, voltage/current isolation, measuring electricity, etc., and can solve problems such as damage accuracy, high cost, unsuitable low cost, mass production, etc.

Inactive Publication Date: 2004-04-07
NIDEC SR DRIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although such systems can achieve high accuracy over a wide bandwidth when well designed, they are generally considered high-cost laboratory equipment and not suitable for low-cost, high-volume production applications
Attempts have been made to make cheaper forms without compromising accuracy too severely, such as those discussed in US 5414400 (Gris), which is hereby incorporated by reference, but require the conductors to be placed in the printed circuit board. cause major assembly problems

Method used

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  • Measurement for current change rate in switch reluctance motor
  • Measurement for current change rate in switch reluctance motor
  • Measurement for current change rate in switch reluctance motor

Examples

Experimental program
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Embodiment Construction

[0032] Figure 5 An embodiment of the invention is shown in which conductor 50 carries the current to be detected. In the field of switched reluctance motors, typically this conductor leads to a phase winding of the switched reluctance motor. The conductors run parallel to the printed circuit board (PCB) and may be held in place by fixtures 52 in the form of components on the PCB, typically using clips or other fasteners. PCB can be dedicated for current detection, such as Figure 5 As shown, or can also have part or all of the control system and power converter to control the motor. For example, it may comprise part or all of components 13 and 14 to control a switched reluctance motor as shown in FIG. 1 .

[0033] It is known in the art to fabricate planar coils on a PCB by arranging conductive tracks, usually copper, on the PCB. Figure 5 The coils are shown arranged above (solid lines) and below (dashed lines) the PCB, the sides of each turn of the coils being connected by v...

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PUM

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Abstract

Measurement for current change rate in switch reluctance motor. A coil is fabricated as two or more tracks (42, 43) of a printed circuit board and arranged close to a conductor (50) to measure the rate of change of current in the conductor. Each turn of the coil is displaced from its neighbouring turn in a direction parallel to the direction of the conductor. The output from the coil may be used to provide a detection signal for a position detection scheme in a switched reluctance drive.

Description

technical field [0001] The present invention involves detecting a point on a current waveform at which the sign of the slope of the current changes. The invention is particularly suitable for controlling switched reluctance motors. Background technique [0002] In the paper "The Characteristics, Design and Applications of Switched Reluctance Motors and Drives" by J M Stephenson and R J Blake at the PCIM'93 Conference and Exhibition, Nuremberg, Germany, June 21-24, 1993, the switched magnetic Control and operation of resistance motors, which is hereby incorporated by reference. In this paper, the "chopped" and "single-pulse" modes of excitation for switched reluctance motors are described for operation of the motor at low and high speeds, respectively. [0003] A typical drive system in the prior art is schematically shown in FIG. 1 . It includes a DC power source 11 which may be a battery or a rectified and filtered AC source. Under the control of the electronic control ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/00G01R15/18G01R31/34H01F5/00H02K11/00H02P6/14H02P6/18H02P25/08
CPCH02P25/085G01R31/343H02K11/00H01F5/003G01R15/181H02P25/092
Inventor M·P·坦卡德A·D·布朗
Owner NIDEC SR DRIVES
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