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Rotor position detection of a switched reluctance drive

A rotor position and rotor technology, applied in electronic commutator, AC motor control, electrical components, etc., can solve problems such as unstable motor performance

Inactive Publication Date: 2005-02-02
NIDEC SR DRIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of these methods are perfect, as the loss of torque will cause instability in the motor performance, and it will take several cycles before stabilization is achieved again, as the current has to ramp up over time in continuous current mode

Method used

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  • Rotor position detection of a switched reluctance drive
  • Rotor position detection of a switched reluctance drive
  • Rotor position detection of a switched reluctance drive

Examples

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Embodiment Construction

[0034] The phase inductance period of a switched reluctance motor is the period of change of phase or inductance per phase, for example the period between the maximum values ​​when the stator poles and the associated respective rotor poles are perfectly aligned. The illustrative embodiment described uses a 2-phase switched reluctance drive device in the electric slewing mode, but any more than one phase number can be used, and the drive device can be in either the electric slewing mode or the power generation mode.

[0035] Figure 5 shows a system for implementing the method embodying the invention. Figure 6 The continuous current waveform used in the system of Figure 5 is schematically illustrated. In this system, the power converter 13 is typically the same as shown in FIG. 1, and the same reference numerals are used where appropriate. The converter 13 controls the switched reluctance motor as described above. The converter 13 itself is controlled by the controller 42. In this ...

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Abstract

The invention relates to a method of detecting rotor position in a reluctance machine which has at least one phase winding with an inductor periodically varied along with the rotor position. The method comprises deriving a value for the flux linkage at a first point is relevant to the at least one phase winding of the reluctance machine; tracking a parameter indicative of flux linkage; pushing the rotor to a second point where a positive voltage is applied to the phase winding; deriving a phase current value and the parameter at a subsequent third point; estimating the flux linkage value of the third point based on the parameter of the third point; and deriving the rotor position from the phase current value and the flux linkage valve of the third point. The invention also relates to a rotor position detector used for the reluctance machine.

Description

Technical field [0001] The invention relates to a sensorless rotor position monitoring in a reluctance motor, in particular to a sensorless rotor position monitoring in a switched reluctance motor. Background technique [0002] The control and operation of switched reluctance motors are generally described in the paper "The Characteristics, Design and Applications of Switched Reluctance Motors and Drives", which was published in 1993 6.21-6.24 were published by JMStephenson and RJBlake at the PCIM 93 conference and exhibition held in Nurnberg, Germany, which are incorporated herein for reference. In the paper, the "chopping" and "single pulse" excitation modes of the switched reluctance motor are described for the low-speed and high-speed operation of the motor, respectively. [0003] Fig. 1 schematically illustrates a typical driving device in the prior art. It includes a DC power supply 11, which can be a battery or an AC power supply that has been rectified and filtered. The D...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P25/08H02P6/16
CPCH02P6/18H02P6/16
Inventor P·R·梅斯
Owner NIDEC SR DRIVES
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