Drive system

Patent metadata

Field	Value
Publication number	US-11799401-B2
Application number	US-202017759092-A
Country	US
Kind code	B2
Filing date	Jan 22, 2020
Priority date	Jan 22, 2020
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

A master device of a drive system transmits identification information of each first period and a first transmission synchronization signal for each first period of a reference period. A first controller adjusts a phase of each first control period such that the first control period is synchronized with a timing associated with a specific first synchronization signal. A second controller adjusts a phase of each second control period such that the second control period is synchronized with a timing associated with a specific second synchronization signal.

First claim

The invention claimed is:

1. A drive system comprising:
a first drive device including a first power converter that supplies first electric power to a winding of a first electric motor and a first controller that controls the first power converter;
a second drive device including a second power converter that supplies second electric power to a winding of a second electric motor and a second controller that controls the second power converter; and
a master device controlling the first controller and the second controller using a first period and a reference period including a plurality of the first periods,
wherein the master device transmits identification information of each first period and a first transmission synchronization signal for each first period of the reference period or transmits identification information of each first period, a first transmission synchronization signal, and a second transmission synchronization signal for each first period of the reference period,
wherein the first controller adjusts a phase of each first control period such that the first control period is synchronized with a timing associated with a specific first synchronization signal out of a plurality of first synchronization signals which are acquired by reception of the first transmission synchronization signal a plurality of times using the identification information and controls the first power converter using the first control period, and
wherein the second controller adjusts a phase of each second control period such that the second control period is synchronized with a timing associated with a specific second synchronization signal out of a plurality of second synchronization signals which are acquired by one of reception of the first transmission synchronization signal a plurality of times and reception of the second transmission synchronization signal a plurality of times using the identification information and controls the second power converter using the second control period.

2. The drive system according to claim 1 , wherein the first controller performs control such that the first synchronization signals not corresponding to the specific first synchronization signal out of the plurality of first synchronization signals are excluded from signals to be controlled at the time of synchronization of the first control period, and
wherein the second controller performs control such that the second synchronization signals not corresponding to the specific second synchronization signal out of the plurality of second synchronization signals are excluded from signals to be controlled at the time of synchronization of the second control period.

3. The drive system according to claim 1 , wherein a reference length of the first period and a reference length of the first control period are different from each other.

4. The drive system according to claim 1 , wherein the master device transmits the first transmission synchronization signal and identification information for identifying each first period in the reference period to the first drive device for each first period in the reference period and transmits the second transmission synchronization signal and the identification information to the second drive device for each first period in the reference period,
wherein the first controller determines a first reference timing associated with a time at which the specific first transmission synchronization signal has been generated in the reference period out of a plurality of first synchronization signals which are acquired by a plurality of receptions of the first transmission synchronization signal using the identification information and adjusts the phase of the first control period such that the first control period is synchronized with the specific first synchronization signal corresponding to the first reference timing, and
wherein the second controller determines a second reference timing associated with a time at which the specific second transmission synchronization signal has been generated in the reference period out of a plurality of second synchronization signals which are acquired by a plurality of receptions of the second transmission synchronization signal using the identification information and adjusts the phase of the second control period such that the second control period is synchronized with the specific second synchronization signal corresponding to the second reference timing.

5. The drive system according to claim 4 , wherein the master device transmits the first transmission synchronization signal having the identification information added thereto to the first drive device and transmits the second transmission synchronization signal having the identification information added thereto to the second drive device,
wherein the first controller adjusts the phase of the first control period to be synchronized with the specific first synchronization signal corresponding to the specific first transmission synchronization signal transmitted at the first reference timing when a value of the identification information added to the first transmission synchronization signal is a predetermined constant value, and
wherein the second controller adjusts the phase of the second control period to be synchronized with the specific second synchronization signal corresponding to the specific second transmission synchronization signal transmitted at the second reference timing when a value of the identification information added to the second transmission synchronization signal is a predetermined constant value.

6. The drive system according to claim 4 , wherein the first controller adjusts the phase of the first control period to be synchronized with the specific first synchronization signal at a first adjustment timing which is delayed by a first time from the first reference timing, and
wherein the second controller adjusts the phase of the second control period to be synchronized with the specific second synchronization signal at a second adjustment timing which is delayed by a second time from the second reference timing.

7. The drive system according to claim 6 , wherein the first controller determines the first adjustment timing on the basis of a first reference time which is transmitted from the master device and which indicates a time at which the specific first transmission synchronization signal has been transmitted, and
wherein the second controller determines the second adjustment timing on the basis of a second reference time which is transmitted from the master device and which indicates a time at which the specific second transmission synchronization signal has been transmitted.

8. The drive system according to claim 1 , wherein the master device transmits the first transmission synchronization signal and the second transmission synchronization signal at different timings.

9. The drive system according to claim 1 , wherein the master device transmits the first synchronization signal and the second synchronization signal in the first period.

10. The drive system according to claim 1 , wherein the first period of the master device is 1/M of the reference period,
wherein the first control period of the first controller is 1/N of the reference period,
wherein the second control period of the second controller is 1/N of the reference period, and
wherein the value of M and the value of N are different from each other.

11. The drive system according to claim 4 , wherein the first drive device includes a first communication processing unit configured to output the identification information added to the first transmission synchronization signal and the specific first synchronization signa

Assignees

• Toshiba Mitsubishi Electric Industrial Systems Corp

Inventors

• ICHIKAWA Soichiro
• Nakamura Masashi
• Ito Takumi

Classifications

• H02P5/56 Primary

  Speed and position comparison between the motors by electrical means · CPC title

• H04L7/04

  Speed or phase control by synchronisation signals {(H04L7/0075 takes precedence)} · CPC title

• H02P5/46 Primary

  for speed regulation of two or more dynamo-electric motors in relation to one another · CPC title