Electric motor system implementing vector and slip control
First Claim
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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 a first mode and a second mode depending on a value of the at least one determined parameter, wherein the first mode is a vector control mode and the second mode is a slip control mode.
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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.
17 Citations
18 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 a first mode and a second mode depending on a value of the at least one determined parameter, wherein the first mode is a vector control mode and the second mode is a slip control mode. - 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 during a transition from a first control mode to a second control mode when the machine is operating in the first control mode and a parameter of the machine increases above a predetermined threshold for the parameter; and increasing the rotor flux component of the voltage while maintaining the torque component of the voltage at an essentially constant level during a transition from the second control mode to the first control mode when the machine is operating in the second control mode and the parameter of the machine decreases below the predetermined threshold for the parameter. - View Dependent Claims (10, 11, 12, 13, 14)
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15. 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 and operate the inverter in a first mode and a second mode depending on a value of the at least one determined parameter, wherein the first mode is a vector control mode and the second mode is a slip control mode. - View Dependent Claims (16, 17, 18)
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Specification