Motor drive system with bus voltage control
AssigneeRockwell Automation Technologies, Inc.
InventorsCraig R. Winterhalter, Robert H. Schmidt, Michael S. Baran, Todd M. Oestreich
Life of this patent
Estimating the term…
Abstract
A method for controlling a motor drive system, the system comprising an AC-DC converter coupled to a DC-AC inverter by a DC bus, a motor coupled to and driven by the inverter, and a load coupled to and driven by the motor is provided. The method includes accessing a motion profile for the motor and load and determining power losses of the converter, the inverter, the motor and the load. The method also includes controlling the voltage of the DC bus based upon the motion profile and the power losses to enhance the motor drive system efficiency, reliability and motor shaft performance.
Claims20
A method for controlling a motor drive system, the system comprising an AC-DC converter coupled to a DC-AC inverter by a DC bus, a motor coupled to and driven by the inverter, and a load coupled to and driven by the motor, the method comprising:
- accessing a motion profile for the motor and load;
- determining power losses of the converter, the inverter, the motor and the load;
- and
- controlling the voltage of the DC bus based upon the motion profile and the power losses.
A method for controlling a motor drive system, the system comprising an AC-DC converter coupled to a DC-AC inverter by a DC bus, a motor coupled to and driven by the inverter, and a load coupled to and driven by the motor, the method comprising:
- accessing a motion profile for the motor and the load;
- determining a voltage profile of the DC bus based upon the motion profile;
- operating the motor drive system to drive the motor and the load;
- sensing at least one operating parameter of the converter, the inverter, the motor and the load;
- and
- adjusting the voltage profile of the DC bus based upon the motion profile and the sensed operating parameters.
A motor drive system, comprising:
- an AC-DC converter configured to convert incoming AC voltage from a power source to DC voltage;
- a DC-AC inverter coupled to the AC-DC converter by a DC bus;
- a motor coupled to and driven by the inverter;
- a load coupled to and driven by the motor;
- and
- a controller operatively coupled to the converter, the inverter, the motor and the load and configured to control the voltage of the DC bus based upon a motion profile of the load and motor, and at least one of reliability and efficiency of the converter, the inverter, and the motor.
Dependencies are inferred from the claim text.