ELECTRIC DRIVE SYSTEM

Abstract

The system (104) comprises: - an electrical machine (108); - a contactor (112) between the electrical machine (108) and an alternating electrical source (106); - an AC-AC converter (114) connecting the set of windings (E) to the source (106) and designed to electrically supply the set of windings (E) from the source (106), the AC-AC converter (114) comprising: • a first bidirectional AC-DC converter (116), • a second bidirectional DC-AC converter (118), and • a capacitive circuit (120) for smoothing the DC voltage (U), located between the first and second converters (116, 118);and - a control device (122) designed to: • control the AC-AC converter (114) to supply, from the source voltage (V0), a polyphase machine voltage (V1) to the set of windings (E) to synchronize the electric machine (108) with the frequency of the source voltage (V0) and then make the phase and amplitude of the machine voltage (V1) substantially equal to those of the source voltage (V0), then • control the contactor (112) in the closed state so that the source voltage (V0) is supplied to the set of windings (E) of the electric machine (108). The control device (122) is further designed, when the contactor (112) is in the closed state, to control the first converter (116) in order to implement a correction of the power factor of the entire electric machine (108) and the first converter (116). Figure for abstract: Fig. 1;

Description

- an electrical machine (108) comprising a rotor (108R) and a stator (108S), the stator (108S) comprising a magnetic core (110) and a set of windings (E) around the magnetic core (110); - a contactor (112) designed to selectively take: • a closed state in which the contactor (112) connects together the set of windings (E) and an alternating electrical source (106) designed to provide a polyphase source voltage (V0), and • an open state in which the contactor (112) disconnects the set of windings (E) and the source (106) from each other; - an AC-AC converter (114) connecting the set of windings (E) at the source (106) and designed to electrically supply the set of windings (E) from the source (106), the AC-AC converter (114) comprising: • a first bidirectional AC-DC converter (116) designed to supply a DC voltage (U) from the source voltage (V0), and vice versa, • a second bidirectional DC-AC converter (118) designed to supply a polyphase voltage (V2) to the set of windings (E) from the DC voltage (U), and vice versa, and • a capacitive circuit (120) for smoothing the direct voltage (U), located between the first and second converters (116, 118); and - a control device (122) being designed to: • control the contactor (112) in the open state, then • controlling the AC-AC converter (114) to supply, from the source voltage (VO), a polyphase machine voltage (VI) to the set of windings (E) to synchronize the electric machine (108) with the frequency of the source voltage (VO) and then make the phase and amplitude of the machine voltage (VI) substantially equal to those of the source voltage (VO), then • deactivating the second converter (118), then • controlling the contactor (112) in the closed state so that the source voltage (VO) is supplied to the set of windings (E) of the electric machine (108); the control device (122) being further designed, when the contactor (112) is in the closed state, to control the first converter (116) in order to implement a correction of the power factor of the entire electric machine (108) and the first converter (116).[Claim 2] The electric drive system (104) of claim 1, wherein the AC-AC converter (114) further comprises an energy absorption device (121) between the first and second converters (116, 118). [Claim 3] The electric drive system (104) of claim 2, wherein the control device (122) is further configured to control the contactor (112) to the open state and then control the second converter (118) to draw active power (P) from the electric machine (108) to supply it to the energy absorption device (121).[Claim 4] An electric drive system (104) according to claim 2 or 3, wherein the control device (122) is further configured to control the contactor (112) in the closed state and then control the first converter (116) to take active power (P) from the electric machine (108) to supply it to the energy absorption device (121). [Claim 5] An electric drive system (104) according to any one of claims 1 to 4, wherein the control device (122) is further configured to control the first converter (116) to.

Claims

to exchange reactive power (dQ) with the network (106) to stabilize the source voltage (V0).

6. An electric drive system (104) according to claim 5, wherein the control device (122) is adapted to stabilize the source voltage (V0) during synchronization of the electric machine (108) with the frequency of the source voltage (V0) or while the phase and amplitude of the machine voltage (VI) are made substantially equal to those of the source voltage (V0).

7. An electric drive system (104) according to claim 5 or 6, wherein the controller (122) is adapted to stabilize the source voltage (V0) during power factor correction.

8. An electric drive system (104) according to any one of claims 1 to 7, wherein the contactor (112) comprises an electromechanical contactor and, if the electric machine (108) is asynchronous, a static contactor in parallel with the electromechanical contactor.

9. Electromechanical system (100) of an aircraft, comprising: - a mechanical load (102), such as a fan, a hydraulic electric pump, a fuel pump, an electric traction actuator or a propulsive propeller of the aircraft; and - a system (104) for electrically driving the mechanical load (102), according to any one of claims 1 to 8.

10. Aircraft comprising an electromechanical system (100) according to claim 9. you ei p / i|

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