Dual three-phase electrical machine and drive with negligible common-mode noise

Patent metadata

Field	Value
Publication number	US-9985566-B2
Application number	US-201615131543-A
Country	US
Kind code	B2
Filing date	Apr 18, 2016
Priority date	May 29, 2015
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

A system and/or method for controlling a dual-three-phase machine with respect to a power electronics inverter is provided. The dual-three-phase machine includes six phase windings divided into at least two windings groups configured to provide a combination of six voltages that achieve zero common-mode voltage and a significantly reduced common-mode noise current.

First claim

The invention claimed is:

1. A power electronics system, comprising:
a power electronics converter configured as a motive drive and to provide pulse-width-modulation; and
a dual-three-phase machine comprising the power electronics converter, a current controller, six phase windings divided into a first and second windings groups, a common-neutral connection connecting the six phase windings, and a common-mode capacitor,
wherein the power electronics converter is a paralleled inverter comprising a first inverter connected to the first windings group and a second inverter connected to the second windings group,
wherein the paralleled inverter is configured to provide a pulse-width-modulation as a motor drive to the six phase windings to generate a zero common-mode pulse width modulation across the first and second windings groups; and
wherein the common-mode capacitor is between the common-neutral connection and a ground,
wherein the common-neutral connection comprises a first neutral connection connecting the first windings group and a second neutral connection, which is separate from the second neutral connection, connecting the second windings group,
wherein the zero common-mode pulse width modulation provided by the paralleled inverter utilizes a reference voltage generated by the current controller and comprises a triangle relationship defined by:

V
ref

⁢

T
s

sin
⁡

(

2
⁢

π
/
3

)

=

V

d
⁢

⁢
c

⁢

t
1

sin
⁢

⁢
θ

=

V

d
⁢

⁢
c

⁢

t
2

sin
⁡

(

π
/
3

-
θ

)

,

where t 1 and t 2 are two vectors corresponding to the first and second windings groups, Vref is the reference voltage with a position of angle θ, and Ts is a switching period,
wherein a voltage of the common-mode pulse width modulation is zero or negligible due to the triangle relationship,
wherein each winding of the first windings groups corresponds to and is in-phase with a winding of the second windings group.

2. The power electronics system of claim 1 , wherein the first and second windings groups form a three-phase, 120° phase-shift machine.

3. The power electronics system of claim 1 , wherein the first and second windings groups are physically distributed in two segments of a stator of the power electronics system.

4. The power electronics system of claim 1 , wherein the first and second windings groups have an identical back-electro-magnetic-force for each winding pair.

5. The power electronics system of claim 1 , wherein the power electronics system is included in an elevator system.

6. A method for controlling a dual-three-phase motor machine comprising a speed controller, a current controller, a zero-common mode pulse width modulation module, a paralleled inverter, six phase windings divided into a first and second windings groups, a common-neutral connection connecting the six phase windings, and a common-mode capacitor, the method comprising:
generating, by the speed controller of the dual-three-phase motor machine, a reference current;
generating, by the current controller of the dual-three-phase motor machine, a reference voltage based on the reference current;
generating, by the zero-common mode pulse width modulation module of the dual-three-phase motor machine, two groups of pulse width modulated signals;
providing the two groups of pulse width modulated signals to a paralleled inverter of the dual-three-phase motor; and
driving, by the paralleled inverter of the dual-three-phase motor machine, the paralleled inverter comprising a first inverter connected to the first windings group and a second inverter connected to the second windings group, first and second windings groups of the dual-three-phase motor via the two groups of pulse width modulated signals as a motor drive to the six phase windings to generate a zero common-mode pulse width modulation across the first and second windings groups,
wherein the common-mode capacitor is between the common-neutral connection and a ground,
wherein the common-neutral connection comprises a first neutral connection connecting the first windings group and a second neutral connection, which is separate from the second neutral connection, connecting the second windings group,
wherein the zero common-mode pulse width modulation provided by the paralleled inverter utilizes the reference voltage generated by the current controller and comprises a triangle relationship defined by:

V
ref

⁢

T
s

sin
⁡

(

2
⁢

π
/
3

)

=

Assignees

• Otis Elevator Co

Inventors

• Jiang Dong

Classifications

• H02P27/08

  with pulse width modulation · CPC title

• H02M2001/123

  Electricity · mapped topic

• H02M7/493

  the static converters being arranged for operation in parallel · CPC title

• H02P25/22 Primary

  Multiple windings; Windings for more than three phases · CPC title

• B66B1/308

  with AC powered elevator drive · CPC title