초록

A device for driving an air-conditioning compressor having an electric motor, in particular for motor vehicles, having an arrangement for reducing the difference in pressure between the intake side and delivery side of the air-conditioning compressor during a starting phase of the electric motor.

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1. A device for driving an air conditioning compressor having an electric motor, in particular for motor vehicles, comprising controllable means (8, 14) for reducing difference in pressure between an intake side and a delivery side of the air-conditioning compressor (6) during a starting phase of th

1. A device for driving an air conditioning compressor having an electric motor, in particular for motor vehicles, comprising controllable means (8, 14) for reducing difference in pressure between an intake side and a delivery side of the air-conditioning compressor (6) during a starting phase of the electric motor (5), said controllable means being disposed in a refrigerant circuit connecting with the compressor. 2. The device as claimed in claim 1, wherein said controllable means for reducing the difference in pressure is formed by an expansion valve (8) which is arranged in the refrigerant circuit. 3. The device as claimed in claim 1, wherein said controllable means for reducing the difference in pressure is formed by a controllable bypass (14) between the intake side and delivery side of the air-conditioning compressor (6). 4. The device as claimed in claim 3, wherein the bypass (14) is arranged within a housing (17) of the air-conditioning compressor (16). 5. The device as claimed in claim 3, wherein the bypass (14) is arranged outside a housing of the air-conditioning compressor (6). 6. The device as claimed in claim 1, wherein said controllable means for reducing the difference in pressure is formed by a speed-controlled valve which is arranged in the air-conditioning compressor. 7. The device as claimed in claim 6, wherein the speed-controlled valve is a centrifugal seal. 8. The device as claimed in claim 1, wherein the electric motor (5) is a sensorless motor having electronic commutation. 9. The device as claimed in claim 1, further comprising a control unit (12) which activates said controllable means (8, 14) for reducing the difference in pressure within a predetermined period of time after the electric motor (5) is switched on, and afterwards switches the motor off again. 10. The device as claimed in claim 1, wherein said controllable means for reducing the difference in pressure is controllable as a function of speed of the air-conditioning compressor (6). 11. The device as claimed in claim 9, wherein the control unit (12) and the electric motor (5) are in heat-conducting connection with refrigerant on the intake side. 12. The device as claimed in claim 10, further comprising a control unit for activating the controllable means, and wherein the control unit (12) and the electric motor (5) are in heat-conducting connection with refrigerant on the intake side. 13. A device for driving an air conditioning compressor having an electric motor, in particular for motor vehicles, comprising controllable means (8, 14) for reducing difference in pressure between an intake side and a delivery side of the air-conditioning compressor (6) during a starting phase of the electric motor (5), said controllable means being disposed in a refrigerant circuit connecting with the compressor wherein said controllable means for reducing the difference in pressure is formed by a first expansion valve (8) which is arranged in the refrigerant circuit, wherein said controllable means for reducing the difference in pressure is formed by a controllable, additional expansion valve (18) which is arranged in the refrigerant circuit between a high-pressure side of the first expansion valve (8) and the intake side of the air-conditioning compressor (6).