Apparatus and method for initially driving a sensorless BLDC motor

摘要

Provided is a sensorless BLDC motor apparatus for providing a drive current allowing the rotor of the BLDC motor to be aligned in a predetermined direction during an initial position setting section (or for a first period of time), and providing a drive current allowing a frequency thereof to be varied at predetermined time intervals so as to accelerate the rotational speed of the BLDC motor during an open loop section (or for a second period of time), and a method using the same.

主权项

1. An apparatus for driving a brushless DC motor (BLDC motor), the apparatus comprising:
an inverter configured to supply a motor drive current to a motor according to a control signal; and a controller configured to generate the control signal, wherein, when initially driving the motor, the controller generates a first control signal for a first period of time and generates a second control signal for a second period of time, the second period of time being after the first period of time, and wherein the first control signal during the first period of time provides a first drive current to align the motor in a prescribed direction and the second control signal during the second period of time provides a second drive current to accelerate the rotational speed of the motor, a frequency of the second drive current being varied at prescribed time intervals within the second period of time, and wherein the frequency of the second drive current is gradually increased at the prescribed time intervals, wherein the controller includes:
a speed controller configured to generate a reference current that controls the speed of the motor based on a reference angular velocity, an angular velocity corresponding to the motor;a current controller configured to generate a reference voltage that controls the motor drive current anda control signal generator configured to generate the control signal based on the reference voltage,wherein the current controller includes:
a first current controller configured to generate the reference voltage based on the reference current generated by the speed controller; anda second current controller configured to generate the reference voltage regardless of the speed controller, andwherein the controller supplies the second drive current to the motor during the second period of time, and controls the inverter based on the second current controller during a third period of time, the third period of time being after the second period of time.