# US 7,609,534 B2 · Operating a three phase device using single phase power

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- Number: US 7,609,534 B2
- Document ID: US7609534B2
- Status: Granted
- Kind: B2
- Application number: 11/573,056
- Filed: 2004-08-19
- Published: 2007-11-01
- Granted: 2009-10-27
- Earliest claimed: 2004-08-19
- Assignees: Otis Elevator Company
- Inventors: Ismail Agirman; Vladimir Blasko; Christopher Czerwinski
- Web page: https://patentgrep.com/patent/US7609534B2

## CPC

- B66B 1/30: effective on driving gear {, e.g. acting on power electronics, on inverter or rectifier controlled motor}
- H02P 23/0004: {Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control}
- H02P 23/22: Controlling the speed digitally using a reference oscillator, a speed proportional pulse rate feedback and a digital comparator
- B66B: ELEVATORS; ESCALATORS OR MOVING WALKWAYS ({apparatus for raising or lowering persons on theatrical stages or the like A63J5/12} ; funicular railbound systems with rigid ground-supported tracks and cable traction, e.g. cliff railways, B61B9/00; arrangements of ammunition handlers in vessels B63G3/00; hoists, lifts, or conveyors for loading or unloading in general B65G; braking or detent devices controlling normal movements of winding drums or barrels B66D; ship-lifting devices E02C; garages for many vehicles with mechanical means for lifting vehicles E04H6/12; hoists for feeding ammunition or projectiles to launching apparatus or to loading mechanisms F41A9/00)
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

## Abstract

A powering arrangement (32, 34) for a device (30, 22) that normally operates on three phase power has the capability of operating based upon single phase power. One disclosed technique includes estimating a direct component based upon a measured voltage across the leads coupled with the single phase power supply. The quadrature component is estimated based upon a numerical derivative of the direct component. The direct component is also provided to a current regulator in a feed forward control manner, which minimizes error.

## Claims

### Claim 1

A device for providing power to an elevator machine, comprising
a converter interface configured to be between a power source and an elevator machine controller, the converter interface providing an output current to the controller, the converter interface comprising:
a phase locked loop portion having three phase inputs, all three of the phase inputs being coupled to a lead of three phase input power if three phase input power is available from the power source, one of the phase inputs being set at zero and two others of the three phase inputs each being coupled to a lead of single phase input power if only single phase input is available from the power source, the phase locked loop portion using an estimated direct component and an estimated quadrature component based on the single phase input power when the single phase input power is available, the estimated direct component comprising a measured voltage of the single phase power;
a proportional integral regulator that provides an indication of a current for eliminating error between a desired current level provided to the controller and an output current level from the converter interface; and
a current regulator portion that uses (i) an output from the phase locked loop portion combined with an output from the proportional integral regulator and (ii) the estimated direct component as a feed-forward input, the current regulator portion allowing the converter interface to provide three phase output power to the elevator machine controller if either the three phase input power or the single phase input power is available.

### Claim 2 (depends on 1)

The device of claim 1, wherein the phase locked loop portion has an R phase input, an S phase input and a T phase input and wherein the T phase input is set at zero volts and the R and S phase inputs are coupled to the leads of the single phase input power.

### Claim 3 (depends on 1)

The device of claim 1, wherein the phase locked loop portion uses a numerical derivative of the estimated direct component as the estimated quadrature component.

### Claim 4 (depends on 3)

The device of claim 3, wherein the phase locked loop portion uses a scaled version of the numerical derivative and wherein a scale applied to the numerical derivative is determined based on a frequency of the single phase input power.

### Claim 5 (depends on 4)

The device of claim 4, wherein a first scale is applied to the numerical derivative if the frequency is above 55 Hz and a second scale is applied if the frequency is below 55 Hz.

### Claim 6 (depends on 1)

The device of claim 1, wherein the current regulator portion comprises a proportional regulator that is responsive to a non-constant disturbance associated with the single phase input power.

### Claim 7 (depends on 6)

The device of claim 6, wherein the feed-forward input is the non-constant disturbance.

### Claim 8

A method of providing power to an elevator machine, comprising
using a converter interface between a power source and an elevator machine controller to provide three phase output power to the elevator machine controller if either three phase input power or single phase input power is available from the power source;
using the three phase input power from the power source when three phase input power is available; and
using the single phase input power from the power source when only single phase input power is available including
determining an estimated direct component and an estimated quadrature component based on the single phase input power, the estimated direct component comprising a measured voltage of the single phase power;
determining a sinusoidal reference in phase with single phase voltage from the power source based on the estimated direct and quadrature components;
determining a current for eliminating error between a desired current level provided to the controller and an output current level from the converter interface; and
regulating current provided to the elevator machine controller based on (i) the determined sinusoidal reference combined with the determined current for eliminating error and (ii) the estimated direct component as a feed-forward input.

### Claim 9 (depends on 8)

The method of claim 8, comprising using a numerical derivative of the estimated direct component as the estimated quadrature component.

### Claim 10 (depends on 9)

The method of claim 9, comprising
using a scaled version of the numerical derivative; and
applying a scale to the numerical derivative that is determined based on a frequency of the single phase input power.

### Claim 11 (depends on 10)

The method of claim 10, comprising applying a first scale to the numerical derivative if the frequency is above 55 Hz and a second scale is applied if the frequency is below 55 Hz.