Active deadtime control for improved torque ripple performance in electric machines
First Claim
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1. A method for implementing active deadtime control of an inverter associated with an electric motor, the method comprising:
- receiving a command voltage signal indicative of a desired load to be driven by the motor;
determining, based upon the value of said command voltage signal, a value of deadtime to be applied to switching circuitry in the inverter;
adjusting the value of said command voltage signal in response to said value of deadtime, thereby producing a compensated command voltage signal to be applied to the motor through the switching circuitry in the inverter; and
wherein said value of deadtime relates to an amount of time in which the switching of a device in the switching circuitry is delayed so as to prevent a short circuit condition within the inverter.
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Abstract
A method for implementing active deadtime control of an inverter associated with an electric motor is disclosed. In an exemplary embodiment, the method includes receiving a command voltage signal indicative of a desired load to be driven by the motor. Based upon the value of the command voltage signal, a determined value of deadtime is applied to switching circuitry in the inverter, wherein the value of deadtime relates to an amount of time in which the switching of a device in the switching circuitry is delayed so as to prevent a short circuit condition within the inverter.
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Citations
10 Claims
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1. A method for implementing active deadtime control of an inverter associated with an electric motor, the method comprising:
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receiving a command voltage signal indicative of a desired load to be driven by the motor;
determining, based upon the value of said command voltage signal, a value of deadtime to be applied to switching circuitry in the inverter;
adjusting the value of said command voltage signal in response to said value of deadtime, thereby producing a compensated command voltage signal to be applied to the motor through the switching circuitry in the inverter; and
wherein said value of deadtime relates to an amount of time in which the switching of a device in the switching circuitry is delayed so as to prevent a short circuit condition within the inverter. - View Dependent Claims (2, 3)
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4. A method for controlling an inverter associated with a brushless electric motor, the method comprising:
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generating a command voltage signal indicative of a desired load to be driven by the motor, said command voltage signal based upon an input torque command signal and a motor speed signal;
determining, based upon the value of said command voltage signal, a value of deadtime to be applied to switching circuitry included within the inverter;
adjusting the value of said command voltage signal in response to said value of deadtime, thereby producing a compensated command voltage signal to be applied to the motor through the switching circuitry in the inverter; and
wherein said value of deadtime relates to an amount of time in which the switching of a device in the switching circuitry is delayed so as to prevent a short circuit condition within the inverter. - View Dependent Claims (5, 6, 7)
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8. An electric power steering system, comprising:
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a steering input device coupled to one or more steerable wheels;
an assist actuator including an electric motor for providing an assist torque to said one or more steerable wheels, said motor further including an inverter for applying a series of phase voltages thereto; and
a controller for generating a set of control signals to be applied to said inverter, said controller further comprising;
means for receiving a command voltage signal indicative of a desired load to be driven by said electric motor;
means for determining, based upon the value of said command voltage signal, a value of deadtime to be applied to switching circuitry in said inverter;
means for adjusting the value of said command voltage signal in response to said value of deadtime, thereby producing a compensated command voltage signal to be applied to the motor through the switching circuitry in the inverter; and
wherein said value of deadtime relates to an amount of time in which the switching of a device in said switching circuitry is delayed so as to prevent a short circuit condition within said inverter.
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9. A storage medium, comprising:
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a machine readable computer program code for implementing active deadtime control of an inverter associated with an electric motor; and
instructions for causing a computer to implement a method, the method further comprising;
receiving a command voltage signal indicative of a desired load to be driven by the motor;
determining, based upon the value of said command voltage signal, a value of deadtime to be applied to switching circuitry in the inverter;
adjusting the value of said command voltage signal in response to said value of deadtime, thereby producing a compensated command voltage signal to be applied to the motor through the switching circuitry in the inverter; and
wherein said value of deadtime relates to an amount of time in which the switching of a device in the switching circuitry is delayed so as to prevent a short circuit condition within the inverter.
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10. A computer data signal, comprising:
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code configured to cause a processor to implement a method for implementing active deadtime control of an inverter associated with an electric motor, the method further comprising;
receiving a command voltage signal indicative of a desired load to be driven by the motor;
determining, based upon the value of said command voltage signal, a value of deadtime to be applied to switching circuitry in the inverter;
adjusting the value of said command voltage signal in response to said value of deadtime, thereby producing a compensated command voltage signal to be applied to the motor through the switching circuitry in the inverter; and
wherein said value of deadtime relates to an amount of time in which the switching of a device in the switching circuitry is delayed so as to prevent a short circuit condition within the inverter.
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Specification