Method for controlling a three-phase electrical machine

Patent metadata

Field	Value
Publication number	US-11075600-B2
Application number	US-201916689676-A
Country	US
Kind code	B2
Filing date	Nov 20, 2019
Priority date	Nov 23, 2018
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

The purpose of the invention is a method for controlling a three-phase electrical machine from an inverter. Each sector of the complex representation of the space vector modulation being subdivided into three subsectors, comprising a central subsector centred on the active vector, a first lateral subsector associated with the first zero-sequence vector, and a second lateral subsector, opposite the first lateral subsector relative to the central subsector, associated with the second zero-sequence vector, it comprises a step of control of the voltage at the terminals of each phase of the electrical machine, measured relative to neutral, with the value defined by the control vector associated with the subsector in which the control vector is located.

First claim

What is claimed is:

1. A method for controlling a three-phase electrical machine from an inverter, where said inverter receives a direct voltage at its input, and delivers at its output three phase voltages enabling the electrical machine to be controlled, where the inverter comprises three branches each comprising an upper switch and a lower switch, where each switch can switch to an open or closed position, where the position of an upper switch of a branch is always the reverse of the position of the lower switch of this same branch, where the simultaneous positions of the switches of the branches of the inverter are represented by a control vector comprising three binary elements, i.e. eight vectors representing the various combinations of the possible positions of the switches, where the vector for which all the upper switches of the branches are in an open position is a first “zero-sequence” vector, and where the vector for which all the upper switches of the branches are in a closed position is a second “zero-sequence” vector, and the other vectors are called “active vectors”, where said active vectors delimit six control sectors as a complex representation, in which at the centre of each sector there is an active vector, where the setpoint control of the electrical machine is represented by a control vector moving from sector to sector with the rotation of the electrical machine's rotor,
wherein, with each sector subdivided into three subsectors, comprising a central subsector centred on the active vector, a first lateral subsector associated with the first zero-sequence vector, and a second lateral subsector, opposite the first lateral subsector relative to the central subsector, associated with the second zero-sequence vector, it comprises a step of control of the voltage at the terminals of each phase of the electrical machine, measured relative to neutral, with the value defined by the control vector associated with the subsector in which the control vector is located.

2. The method according to claim 1 , in which the first lateral subsector precedes the central subsector, and the second lateral subsector succeeds the central subsector in each sector corresponding to the first, third and fifth control vectors.

3. The method according to claim 2 , in which the angle (θ VX ) of the angle sector corresponding to the central subsector of each sector is between U and

π
3

radians.

4. The method according to claim 2 , in which the angle (θ VX ) of the angle sector corresponding to the central subsector of each sector is defined in radians using the following formula:

θ
VX

=



V

αβ
⁢

⁢
norm

→



3
2

×

2
π

×

π
3

.

5. The method according to claim 2 , where said method is a full-wave space vector modulation.

6. The method according to claim 1 , in which the first lateral subsector precedes the central subsector, and the second lateral subsector succeeds the central subsector in each sector corresponding to the second, fourth and sixth control vectors.

7. The method according to claim 6 , in which the angle (θ VX ) of the angle sector corresponding to the central subsector of each sector is between 0 and

π
3

radians.

8. The method according to claim 6 , in which the angle (θ VX ) of the angle sector corresponding to the central subsector of each sector is defined in radians using the following formula:

θ
VX

=



V

αβ
⁢

⁢
norm

→



3
2

×

2
π

×

π
3

.

9. The method according to claim 6 , where said method is a full-wave space vector modulation.

10. The method according to claim 1 , in which the angle (θ VX ) of the angle sector corresponding to the central subsector of each sector is between 0 and

π
3

radians.

11. The method according to claim 10 , in which the angle (θ VX ) of the angle sector corresponding to the central subsector of each sector is defined in radians using the following formula:

θ
VX

=



V

αβ
⁢

⁢
norm

→



3
2

×

2
π

×

π
3

.

Assignees

• Valeo Siemens Eautomotive France Sas

Inventors

• Chauvenet Pierre-Alexandre

Classifications

• H02P27/06 Primary

  using DC to AC converters or inverters (H02P27/05 takes precedence) · CPC title

• H02P23/0004

  Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control · CPC title

• B60L15/20

  for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed · CPC title

• B60L50/60

  using power supplied by batteries (in combination with fuel cells B60L50/75) · CPC title

• B60L2210/40

  DC to AC converters · CPC title