Electric motor system implementing vector and slip control
First Claim
1. A system for controlling an electric machine comprising:
- a power source configured to supply electric energy to the electric machine;
an inverter operationally connected to the power source and the electric machine and configured to increase or decrease a rotor flux component of a voltage applied to the electric machine while maintaining a torque component of the voltage at an essentially constant level; and
a control device configured to determine at least one parameter of the electric machine and operate the inverter in either a first or a second mode in response to the at least one determined parameter.
1 Assignment
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Accused Products
Abstract
A system is provided for controlling an electric machine. The system has a power source configured to supply electric energy to the electric machine. In addition, the system has an inverter operationally connected to the power source and the electric machine and configured to increase or decrease a rotor flux component of a voltage applied to the electric machine, while maintaining a torque component at an essentially constant level. The system further has a control device configured to determine at least one parameter of the electric machine and operate the inverter in either a first or a second mode in response to the at least one determined parameter.
13 Citations
20 Claims
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1. A system for controlling an electric machine comprising:
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a power source configured to supply electric energy to the electric machine; an inverter operationally connected to the power source and the electric machine and configured to increase or decrease a rotor flux component of a voltage applied to the electric machine while maintaining a torque component of the voltage at an essentially constant level; and a control device configured to determine at least one parameter of the electric machine and operate the inverter in either a first or a second mode in response to the at least one determined parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling an electric machine comprising:
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applying a voltage to a current passing through the electric machine; and increasing a rotor flux component of the voltage while maintaining a torque component of the voltage at an essentially constant level. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A machine comprising:
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at least one traction device; a power source configured to generate a power output; and an electric drive configured to receive the power output and drive the at least one traction device, the electric drive having; a generator; an electric motor powered by the generator; an inverter operationally connected to the generator and the electric motor and configured to increase or decrease a rotor flux component of a voltage applied to the electric motor while maintaining the torque component of the applied voltage at an essentially constant level; and a controller configured to determine at least one parameter indicative of a rotor speed or applied voltage of the electric motor. - View Dependent Claims (18, 19, 20)
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Specification