Field-oriented control for control of blood pump motor
AssigneeHeartWare, Inc.
InventorsFernando Casas, Carlos Reyes, Justin Wolman
Life of this patent
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Abstract
A ventricular assist device includes a pump configured to pump blood of a patient. A motor is configured to operate the pump. First, second, and third conductors are coupled to the motor and are configured to supply electric current from a power supply to the motor in first, second, and third phases, respectively. A controller is configured to operate the motor using a Field Oriented Control (FOC) method, and if one from the group consisting of first, second and third conductors becomes unable to supply electric current to the motor, the controller continues to operate the motor using the FOC method using the phases of the two conductors that are able to supply electric current to the motor.
Claims17
A ventricular assist device, comprising:
- a pump configured to pump blood of a patient;
- a motor configured to operate the pump;
- the pump includes a housing configured for implantation within the body of the patient, the housing having a blood inlet for connection to a ventricle of the patient and a blood outlet for connection to an artery of the patient, wherein the motor is disposed within the housing;
- first, second, and third conductors coupled to the motor and configured to supply electric current from a power supply to the motor in first, second, and third phases, respectively;
- and
- a controller configured to operate the motor using a Field Oriented Control (FOC) method, and if one from the group consisting of first, second and third conductors becomes unable to supply electric current to the motor, the controller continues to operate the motor using the FOC method using the phases of the two conductors that are able to supply electric current to the motor.
A method for operating a ventricular assist device, the ventricular device comprising a pump, a motor connected to the pump, a controller connected to the motor, and a power source supplying power to the motor through first, second, and third phase connections, the method comprising:
- operating three-phase excitation of the motor through the first, second, and third phase connections to drive the motor and pump using a Field Oriented Control (FOC) method;
- determining vector control variables comprising a torque and a slip angle of a rotor of the blood pump, the supply power to the blood pump is controlled by signals representative of the vector control variables;
- and
- if one of the first, second, and third phase connections fails, continuing to drive the motor and pump using the FOC method using the two phase connections that have not failed.
A method for operating a blood pump implanted in a patient, the blood pump including a rotor with permanent magnetic poles for rotation around an axis, and a plurality of stator windings in magnetic communication with the magnetic poles of the rotor, comprising:
- supplying power to the blood pump using a Field Oriented Control (FOC) method;
- determining vector control variables comprising a torque and a slip angle of the rotor, the supply power to the blood pump is controlled by signals representative of the vector control variables;
- and
- if one of the stator windings of the blood pump fails, continuing to supply power to the blood pump over the remaining stator windings using the FOC method.
A control circuit for operating a blood pump implanted in a patient, the blood pump including a rotor with permanent magnetic poles for rotation around an axis, and a plurality of stator windings in magnetic communication with the magnetic poles of the rotor, the control circuit configured to:
- supply power to the blood pump using a Field Oriented Control (FOC) method;
- and
- determine vector control variables comprising a torque and a slip angle of the rotor, and the supply of power to the blood pump is controlled by signals representative of the vector control variables;
- and
- if one of the stator windings of the blood pump fails, continuing to supply power to the blood pump over the remaining stator windings using the FOC method.
Dependencies are inferred from the claim text.