METHOD FOR CONTROLLING A ROTARY ELECTRIC MACHINE IN CASE OF LOAD SHEDDING AND CORRESPONDING POWER CONTROL MODULE

• US 20100201304A1
• Filed: 05/21/2008
• Published: 08/12/2010
• Est. Priority Date: 06/08/2007
• Status: Active Grant

• Current Assignee: Valeo Equipements Electriques Moteur (Valeo SE)
• Original Assignee: Valeo Equipements Electriques Moteur (Valeo SE)
• Inventors: Chemin, Michaël
• Granted Patent: US 8,294,412 B2
• Time in Patent Office: Days
• US Class Current: 318/806
• CPC Class Codes: H02H 7/067 on occurrence of a load dump control on sudden change of load H02P9/10
• CPC Class Codes: H02J 7/00308 Overvoltage protection
• CPC Class Codes: H02J 7/1492 by means of controlling devices between the generator output and the battery
• CPC Class Codes: Y02T 10/92 Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

Abstract

A method for controlling a rotary electrical machine and a control and power module for a rotary electrical machine. The rotary electrical machine includes a plurality of phase windings (9), a power circuit (12, 16) which comprises a plurality of arms each formed by a bridge of switches and which is capable of supplying an electrical network at an output voltage (Vres) equal to a nominal voltage when the bridge of switches is in a nominal mode of operation, an excitation winding (11) through which flows an excitation current (I exc) which generates a magnetic flux in a magnetic excitation circuit (10), and an electronic control circuit (7) which operates the power circuit and controls the excitation current. The method includes locking the bridge in at least one arm of the power circuit in a conductive state when the output voltage exceeds a voltage threshold higher than the nominal voltage. The nominal mode of operation of the bridge is returned to independently of the output voltage.

Claims

1. ) A method of controlling a rotary electrical machine connected to an electrical system in the event of a load dump, the said machine comprising:

a plurality of phase windings (9),

a power circuit (12, 16) which comprises a plurality of arms, each formed by a bridge of switches, which are intended to be associated with the said phase windings (9), which power circuit (12, 16) is capable of supplying the said electrical system at an output voltage (Vres) equal to a nominal voltage (Vn) when the said bridge of switches is in a nominal mode of operation,

an excitation winding (11) through which flows an excitation current (I exc) which produces a magnetic flux in a magnetic excitation circuit (10),

an electronic control and regulating circuit (7) which operates the said power circuit (12, 16) and controls the said excitation current (I exc),

and the said method being of the type which comprises locking the said bridge of switches in at least one of the arms of the said power circuit (12, 16) in a conductive state when the said output voltage (Vres) exceeds a predetermined voltage threshold (Vs) higher than the said nominal voltage (Vn),

characterized in that the said nominal mode of operation of the said bridge of switches is returned to independently of the said output voltage (Vres).

2. ) A method of controlling a rotary electrical machine according to claim 1, characterized in that the said nominal mode of operation of the said bridge of switches is returned to after a predetermined delay at least equal to the de-magnetization time (Δ

t) of the said magnetic excitation circuit (10).

3. ) A method of controlling a rotary electrical machine according to claim 1, characterized in that the said nominal mode of operation of the said bridge of switches is returned to when the said excitation current (I exc) drops below a predetermined current threshold (I s).

4. ) A method of controlling a rotary electrical machine according to claim 1, characterized in that the said nominal mode of operation of the said bridge of switches is returned to after a period at least equal to the de-magnetization time of the said magnetic excitation circuit and when the said excitation current (I exc) drops below a predetermined current threshold (I s).

5. ) A method of controlling a rotary electrical machine according to claim 1 characterized in that the said power circuit (12, 16) also comprises means for storing energy (16).

6. ) A method of controlling a rotary electrical machine according to claim 1 characterized in that the said electrical system is a vehicle electrical system of a motor vehicle.

7. ) A control and power module (7, 12, 16) for a rotary electrical machine which is connected to an electrical system, the said machine having a plurality of phase windings (9), and an excitation winding (11) through which flows an excitation current (I exc) which produces a magnetic flux in a magnetic excitation circuit (10), the said module (7, 12, 16) comprising:

a power circuit (12, 16) which comprises a plurality of arms, each formed by a bridge of switches, which are intended to be associated with the said phase windings (9), which power circuit (12, 16) is capable of supplying the said electrical system at an output voltage (Vres) equal to a nominal voltage (Vn) when the said bridge of switches is in a nominal operating mode,

an electronic control and regulating circuit (7) which operates the said power circuit (12, 16) and which controls the said excitation current (I exc), the said electronic circuit (7) also comprising means for locking the said bridge of switches in an least one of the said arms of the said power circuit (12, 16) in a conductive state when the said output voltage (Vres) exceeds a predetermined voltage threshold higher than the nominal voltage (Vn),

characterized in that the said module also comprises means for returning to the nominal mode of operation of the bridge of switches independently of the said output voltage (Vres).

8. ) A control and power module (7, 12, 16) for a rotary electrical machine according to claim 7, characterized in that the said returning means act after a predetermined delay at least equal to the de-magnetization time (Δ

t) of the said magnetic excitation circuit (10).

9. ) A control and power module (7, 12, 16) for a rotary electrical machine according to claim 7, characterized in that the said returning means act when the said excitation current (I exc) drops below a predetermined current threshold (I s).

10. ) A control and power module (7, 12, 16) for a rotary electrical machine according to claim 7, characterized in that the said returning means act after a period at least equal to the de-magnetization time (Δ

t) of the said magnetic excitation circuit (10) and when the said excitation current (I exc) drops below a predetermined current threshold (I s).

11. ) A control and power module (7, 12, 16) for a rotary electrical machine according to claim 7 characterized in that the said power circuit also comprises means for storing energy (16).

12. ) A rotary electrical machine comprising a control and power module (7, 12, 16) according to claim 7.