Rotating electric machine for a motor vehicle

Patent metadata

Field	Value
Publication number	US-2017194892-A1
Application number	US-201515313311-A
Country	US
Kind code	A1
Filing date	Apr 28, 2015
Priority date	May 22, 2014
Publication date	Jul 6, 2017
Grant date	—

Abstract

A rotating electrical machine for a motor vehicle comprising a rotor ( 2 ) supplied with an excitation current (ie), a stator ( 3 ) comprising a polyphase winding and coupled to the rotor ( 2 ), a thermal protection module ( 4 ) suitable for evaluating at least one temperature (T 1, T 2, T 3 ) in the machine and for comparing the temperature with an associated thermal protection threshold (Th), a control device ( 5 ) supplying the excitation current (ie) depending on an operation mode command (RQ) and the temperature comparison, so as to operate the rotating electrical machine ( 1 ) according to a mode of operation chosen from a nominal generator mode in which the machine is configured to deliver a first maximum power or at least one extended generator mode in which the machine is configured to deliver a second maximum power greater than said first maximum power.

First claim

1 . Rotary electrical machine ( 1 ) for a motor vehicle, wherein said rotary electrical machine ( 1 ) comprises:
a rotor ( 2 ) which is supplied by an excitation current (ie); a stator ( 3 ) which comprises a polyphase winding, and is coupled to said rotor ( 2 ); a thermal protection module ( 4 ) which is designed to evaluate at least one temperature (T) in the rotary electrical machine ( 1 ), and to compare the said at least one temperature (T) with an associated thermal protection threshold (Th); a device ( 5 ) for control of the rotor ( 2 ) which supplies the excitation current (ie) according to an operating mode command (RQ) received from a motor control unit ( 6 ) of said motor vehicle, and according to said temperature comparison, such as to make the rotary electrical machine ( 1 ) operate according to an operating mode (M) from amongst: a nominal generator mode (M 1 ), in which the machine is configured to provide a first maximum power; or at least one extended generator mode (M 2 , M 2 ′), in which the machine is configured to provide a second maximum power greater than said first maximum power.

2 . Rotary electrical machine ( 1 ) according to claim 1 , wherein the control device ( 5 ) is designed to limit the excitation current (ie) of the rotor ( 2 ), in order to make the rotary electrical machine ( 1 ) operate in the nominal generator mode (M 1 ) if its temperature (T) is higher than the associated thermal protection threshold (Th).

3 . Rotary electrical machine ( 1 ) according to claim 1 , wherein the control device ( 5 ) is designed to increase the excitation current (ie) of the rotor ( 2 ), in order to make the rotary electrical machine ( 1 ) operate in the extended generator mode (M 2 , M 2 ′) if its temperature (T) is lower than the protection threshold (Th) determined, and if the control device ( 5 ) receives an operating mode command (RQ) in extended generator mode (M 2 , M 2 ′).

4 . Rotary electrical machine ( 1 ) according to claim 1 , wherein the adaptation of the excitation current (ie) is carried out according to a maximum excitation current (ie max ) cartography (C 1 , C 2 ) not to be exceeded according to the speed (N) of the rotor ( 2 ), a cartography (C) being associated with a given operating mode (M).

5 . Rotary electrical machine ( 1 ) according to claim 1 , wherein the thermal protection module ( 4 ) is designed to evaluate the following three temperatures (T):
a first temperature (T 1 ) of the stator ( 3 ); a second temperature (T 2 ) of power modules ( 7 ) connected to the stator ( 3 ); and a third temperature (T 3 ) of the control device ( 5 ).

6 . Rotary electrical machine ( 1 ) according to claim 5 , wherein the first temperature (T 1 ) of the stator ( 3 ) is:
a temperature value (V 1 ) measured on the stator ( 3 ) via a temperature sensor (Ct); or an estimated temperature value (V 2 ) of the stator ( 3 ).

7 . Rotary electrical machine ( 1 ) according to claim 6 , wherein the estimated temperature value (V 2 ) of the stator ( 3 ) is based on:
the ambient temperature θa); an increase in temperature (Δt) between the ambient temperature (θamb) and the temperature of the stator; the thermal capacity (Cth) of the rotary electrical machine ( 1 ); the thermal conductance (Gth) of the rotary electrical machine ( 1 ); and the equivalent losses (Ps) of the stator ( 3 ).

8 . Rotary electrical machine ( 1 ) according to claim 1 , wherein the control device ( 5 ) is designed to transmit to a motor control unit ( 6 ) of the motor vehicle information (F) relating to the operating mode (M) of the said rotary electrical machine ( 1 ).

9 . Rotary electrical machine ( 1 ) according to claim 1 , wherein the said rotary electrical machine is an alternator-starter.

10 . Rotary electrical machine ( 1 ) according to claim 1 , wherein the said rotary electrical machine is an alternator.

11 . Rotary electrical machine ( 1 ) according to claim 1 , wherein an extended generator mode (M 2 ′) is a recuperative braking mode.

12 . Rotary electrical machine ( 1 ) according to claim 2 , wherein the control device ( 5 ) is designed to increase the excitation current (ie) of the rotor ( 2 ), in order to make the rotary electrical machine ( 1 ) operate in the extended generator mode (M 2 , M 2 ′) if its temperature (T) is lower than the protection threshold (Th) determined, and if the control device ( 5 ) receives an operating mode command (RQ) in extended generator mode (M 2 , M 2 ′).

13 . Rotary electrical machine ( 1 ) according to claim 2 , wherein the adaptation of the excitation current (ie) is carried out according to a maximum excitation current (ie max ) cartography (C 1 , C 2 ) not to be exceeded according to the speed (N) of the rotor ( 2 ), a cartography (C) being associated with a given operating mode (M).

14 . Rotary electrical machine ( 1 ) according to claim 3 , wherein the adaptation of the excitation current (ie) is carried out according to a maximum excitation current (ie max ) cartography (C 1 , C 2 ) not to be exceeded according to the speed (N) of the rotor ( 2 ), a cartography (C) being associated with a given operating mode (M).

15 . Rotary electrical machine ( 1 ) according to claim 2 , wherein the thermal protection module ( 4 ) is designed to evaluate the following three temperatures (T):
a first temperature (T 1 ) of the stator ( 3 ); a second temperature (T 2 ) of power modules ( 7 ) connected to the stator ( 3 );and a third temperature (T 3 ) of the control device ( 5 ).

16 . Rotary electrical machine ( 1 ) according to claim 3 , wherein the thermal protection module ( 4 ) is designed to evaluate the following three temperatures (T):
a first temperature (T 1 ) of the stator ( 3 ); a second temperature (T 2 ) of power modules ( 7 ) connected to the stator ( 3 );and a third temperature (T 3 ) of the control device ( 5 ).

17 . Rotary electrical machine ( 1 ) according to claim 4 , wherein the thermal protection module ( 4 ) is designed to evaluate the following three temperatures (T):
a first temperature (T 1 ) of the stator ( 3 ); a second temperature (T 2 ) of power modules ( 7 ) connected to the stator ( 3 ); and a third temperature (T 3 ) of the control device ( 5 ).

Assignees

• Valeo Equip Electr Moteur

Inventors

• Granziera Cyril
• Malbranque Ronald

Classifications

• H02P29/40

  Regulating or controlling the amount of current drawn or delivered by the motor for controlling the mechanical load · CPC title

• H02P9/107 Primary

  for limiting effects of overloads · CPC title

• H02P29/60

  Controlling or determining the temperature of the motor or of the drive (H02P29/02 takes precedence) · CPC title

• H02P29/664 Primary

  the rotor having windings · CPC title