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Method and device for determination of initial rotor position in synchronus motor by degree of Fe saturation

A stator inductance and stator technology, which is applied in elevators, electronic commutation motor control, measurement devices, etc., can solve problems affecting inductance calculation, etc., and achieve the effect of high noise immunity

Inactive Publication Date: 2004-04-21
OTIS ELEVATOR CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, bad samples due to noise can dramatically affect inductance calculations

Method used

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  • Method and device for determination of initial rotor position in synchronus motor by degree of Fe saturation
  • Method and device for determination of initial rotor position in synchronus motor by degree of Fe saturation
  • Method and device for determination of initial rotor position in synchronus motor by degree of Fe saturation

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Embodiment Construction

[0023] Referring to Figure 1 , an exemplary embodiment of an elevator system according to the present invention is generally indicated at 10 . The elevator system includes an elevator shaft 12 having an elevator car 14 disposed therein for vertical movement. Elevator car 14 is suspended and connected to counterweight 16 for movement relative thereto by a set of elevator ropes 18 . The car guide rails 20 and counterweight guide rails 22 provide a plurality of "T" shaped rails that guide the elevator car 14 and counterweight 16 respectively through the hoistway 12 . An elevator hoist 24 driven by a three-phase four-pole permanent magnet synchronous motor 26 is positioned within an elevator hoist room 28 and provides mechanical power for hoisting the elevator car 14 and passengers.

[0024] The elevator control system 29 includes an alternating current variable frequency (ACVF) drive 30 and an elevator control 34 . The electric power source for the motor 26 is supplied by an AC...

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Abstract

A method and apparatus of determining the position of a rotor at standstill relative to a stator in a synchronous motor elevator machine includes injecting an AC current having a predetermined single frequency and a predetermined initial phase angle into a stator coil of the stator, and sampling the injected current and resultant voltage a predetermined number of times per period of the frequency. Subsequently the method calculates a stator inductance from the sampled voltages and currents using a DFT. By incrementing the initial phase angel a predetermined number of times over a 360 degree cycle, and repeating the injecting, sampling, and calculating with each incremented phase angle, the algorithm provides a predetermined number of calculated stator inductances. The position of the d axis relative to the stator is then determined from the minimum of the calculated stator inductances.

Description

technical field [0001] The present invention generally relates to a method and apparatus for angular positioning of a motor. More specifically, the present invention relates to techniques and apparatus for calculating the absolute angular position of a synchronous motor elevator hoist by means of the determination of stator iron saturation. Background technique [0002] Permanent magnet synchronous motors for elevator systems offer several advantages over traditional induction elevator hoists in the size required for a given task. However, elevator systems using synchronous motor elevator elevators must be able to determine the absolute angular position of the rotor, ie the position and direction of the d-axis of the rotor flux relative to the stator pole windings in order to be able to obtain maximum torque. [0003] This is especially important when the rotor position is lost due to an accident such as a power outage. When the elevator experiences a loss of power, the el...

Claims

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Application Information

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IPC IPC(8): B66B1/30H02P6/18H02P21/00H02P21/14H02P27/04
CPCH02P21/146H02P6/185H02P21/18G01P3/00
Inventor D·J·马文T·A·西蒙兹V·佩特罗维克M·舍帕A·韦基奥蒂
Owner OTIS ELEVATOR CO
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