Method for Braking an AC Motor
AssigneeSiemens Energy & Automation, Inc.
InventorsRichard H. Osman, Mukul Rastogi
Life of this patent
Estimating the term…
Abstract
A system for braking a motor. The system includes at least one resistor and a contactor connected to the at least one resistor and a motor. The system further includes a variable frequency drive electrically connected to the motor, wherein the variable frequency drive comprises a controller operably connected to the contactor, wherein at least a portion of the contactor closes connecting the at least one resistor to the motor in response to a command from the controller. The variable frequency drive is configured such that motor flux levels may be maintained at a relatively high level as motor torque current is reduced, resulting in a consistently high motor flux level as the motor speed decreases.
Claims16
A system for braking a motor, comprising:
- at least one resistor;
- a contactor connected to the at least one resistor and a motor;
- and
- a variable frequency drive electrically connected to the motor, wherein the variable frequency drive comprises a controller operably connected to the contactor, wherein at least a portion of the contactor closes connecting the at least one resistor to the motor in response to a command from the controller.
A method for braking a motor, the method comprising:
- detecting, by a variable frequency drive, a reduction in speed demand, wherein the reduction initiates deceleration of an motor;
- issuing a command by the variable frequency drive to close at least one contactor, wherein the closed contactor connects a resistor bank to the motor;
- and
- absorbing, by the resistor bank, deceleration current generated by the motor.
A system for braking a motor, the system comprising:
- a resistor bank having a plurality of phases;
- a contactor connected to the resistor bank and a motor, the contactor having a plurality of phases, wherein each phase of the contactor is connected to one phase of the resistor bank;
- and
- a variable frequency drive electrically connected to the motor, wherein the variable frequency drive comprises a controller operably connected to the contactor, wherein at least a portion of the contactor closes connecting the at least one resistor to the motor in response to a command from the controller.
Dependencies are inferred from the claim text.