Method and device for operating an electrical machine having separate excitation
First Claim
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1. A method for operating an electrical machine having separate excitation, the method comprising:
- determining a variable that characterizes a stator temperature; and
shifting a current distribution between an excitation current and stator currents for the electrical machine at least in specifiable operating ranges, as a function of the variable characterizing the stator temperature,wherein in a first operating range, in which the stator temperature lie(s) below a specifiable first limit value, the excitation current and the stator currents for a specified working point of the electrical machine, which is defined by a torque and an engine speed, are specified in efficiency-optimized manner independently of the stator temperature.
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Abstract
A method and a device for operating an electrical machine having separate excitation, especially a synchronous machine. With the aid of a sensor system, a variable characterizing a rotor temperature and/or a stator temperature are/is determined, and an excitation current and stator currents for the electrical machine are specified by a control unit as a function of the variable characterizing the rotor temperature and/or the stator temperature, at least in specifiable operating ranges.
23 Citations
13 Claims
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1. A method for operating an electrical machine having separate excitation, the method comprising:
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determining a variable that characterizes a stator temperature; and shifting a current distribution between an excitation current and stator currents for the electrical machine at least in specifiable operating ranges, as a function of the variable characterizing the stator temperature, wherein in a first operating range, in which the stator temperature lie(s) below a specifiable first limit value, the excitation current and the stator currents for a specified working point of the electrical machine, which is defined by a torque and an engine speed, are specified in efficiency-optimized manner independently of the stator temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A device for operating an electrical machine having separate excitation, comprising:
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a sensor system for detecting a variable characterizing a stator temperature; and a control unit, which shifts a current distribution between an excitation current and stator currents for the electrical machine as a function of the variable characterizing the stator temperature, at least in specifiable operating ranges, wherein in a first operating range, in which the stator temperature lie(s) below a specifiable first limit value, the excitation current and the stator currents for a specified working point of the electrical machine, which is defined by a torque and an engine speed, are specified in efficiency-optimized manner independently of the stator temperature. - View Dependent Claims (12, 13)
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Specification