Drive system
First Claim
Patent Images
1. A drive system for a motor vehicle, comprising:
- a drive shaft arranged for rotating about an axis of rotation;
an electric machine having a stator arrangement and a rotor arrangement rotatable relative to said stator arrangement for rotation about said axis of rotation with said drive shaft, said rotor arrangement having permanent magnets, wherein said electric machine is selectively operable as a motor for producing a torque for rotating said drive shaft and as a generator for obtaining electric energy from rotation of the drive shaft; and
a heat transfer arrangement operatively arranged for conducting a heat transfer fluid in a closed loop for selectively adding heat to said rotor arrangement for heating said rotor arrangement to a desired operating temperature range of said rotor arrangement and maintaining said rotor arrangement at said desired operating temperature, wherein said desired operating temperature of said rotor arrangement is approximately 10-50°
C. below a temperature at which an irreversible impairment of a magnetization of the rotor arrangement occurs.
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Accused Products
Abstract
A drive system for a motor vehicle includes a drive shaft and an electric machine operatively connected to the shaft for rotating the shaft and obtaining electric energy during rotation of the drive shaft. The electric machine includes a stator arrangement and a rotor arrangement which can be rotated with the aid of the drive shaft and is operated by permanent magnet. A heat transfer arrangement arranged in the drive system for bringing the rotor arrangement to a desired operating temperature and/or to maintain the desired operating temperature.
17 Citations
16 Claims
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1. A drive system for a motor vehicle, comprising:
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a drive shaft arranged for rotating about an axis of rotation;
an electric machine having a stator arrangement and a rotor arrangement rotatable relative to said stator arrangement for rotation about said axis of rotation with said drive shaft, said rotor arrangement having permanent magnets, wherein said electric machine is selectively operable as a motor for producing a torque for rotating said drive shaft and as a generator for obtaining electric energy from rotation of the drive shaft; and
a heat transfer arrangement operatively arranged for conducting a heat transfer fluid in a closed loop for selectively adding heat to said rotor arrangement for heating said rotor arrangement to a desired operating temperature range of said rotor arrangement and maintaining said rotor arrangement at said desired operating temperature, wherein said desired operating temperature of said rotor arrangement is approximately 10-50°
C. below a temperature at which an irreversible impairment of a magnetization of the rotor arrangement occurs.- View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A drive system for a motor vehicle, comprising:
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a drive shaft arranged for rotating about an axis of rotation;
an electric machine having a stator arrangement and a rotor arrangement rotatable relative to said stator arrangement for rotation about said axis of rotation with said drive shaft, said rotor arrangement having permanent magnet, wherein said electric machine is selectively operable as a motor for producing a torque for rotating said drive shaft and as a generator for obtaining electric energy from rotation of the drive shaft; and
a heat transfer arrangement operatively arranged for conducting a heat transfer fluid in a closed loop for selectively adding heat to said rotor arrangement for heating said rotor arrangement to a desired operating temperature range of said rotor arrangement and maintaining said rotor arrangement at said desired operating temperature, wherein said heat transfer arrangement is operatively arranged so that in a first operating phase in which a temperature of the heat transfer fluid is higher than a temperature prevailing in the region of said rotor arrangement, and the temperature prevailing in the region of said rotor arrangement is lower than said desired operating temperature, the heat transfer fluid is fed to said rotor arrangement for heat transfer. - View Dependent Claims (9, 10, 11)
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12. A method for operating a drive system for a motor vehicle having a drive shaft and an electric machine, the electric machine being selectively operable as an electric motor for rotating the drive shaft and as a generator for obtaining electric energy from the rotating drive shaft, the electric machine having a stator arrangement and a rotor arrangement which is fixed with respect to rotation relative to the drive shaft and is operated by a permanent magnet, the method comprising the steps of:
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(a) determining a desired operating temperature for the rotor arrangement to a temperature approximately 10-50°
C. below a temperature at which an irreversible impairment of the magnetization of the rotor arrangement occurs; and
(b) setting the temperature prevailing in the region of the rotor arrangement to the desired operating temperature determined in said step (a). - View Dependent Claims (13, 14, 15)
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16. A method for operating a drive system for a motor vehicle having a drive shaft and an electric machine, the electric machine being selectively operable as an electric motor for rotating the drive shaft and as a generator for obtaining electric energy from the rotating drive shaft, the electric machine having a stator arrangement and a rotor arrangement which is fixed with respect to rotation relative to the drive shaft and is operated by a permanent magnet, the method comprising the steps of:
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(a) determining a desired operating temperature for the rotor arrangement; and
(b) setting the temperature prevailing in the region of the rotor arrangement to the desired operating temperature determined in said step (a), wherein said step (b) comprises the steps of;
(c) feeding the heat transfer fluid to the rotor arrangement for heat transfer if the drive system is in a first operating phase in which a temperature of the heat transfer fluid is higher than a temperature prevailing in the region of the rotor arrangement, and the temperature prevailing in the region of the rotor arrangement is lower than the desired operating temperature;
(d) diminishing the supply of the heat transfer fluid to the rotor arrangement if the drive system is in a second operating phase in which the temperature of the heat transfer fluid is not higher than the temperature prevailing in the region of the rotor arrangement, and the temperature prevailing in the region of the rotor arrangement is lower than the desired operating temperature, and (e) feeding of the heat transfer fluid is performed for the purpose of keeping the rotor arrangement temperature at the desired operating temperature by a closed temperature loop when the drive system is in a third operating phase in which the temperature prevailing in the region of the rotor arrangement is at the desired operating temperature.
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Specification