Abstract: A method for controlling a device for automatically adjusting an airway opening body position is provided. The device includes a horizontal base plate, a head support block, a back support plate, a neck support apparatus, a head cover assembly, and a programmable logic controller (PLC). The neck support apparatus is positioned between the head support block and the back support plate. The PLC is configured to controls a stroke of an electric cylinder according to the following equations: ?=1.235?+?, and ?=KX+B+C, where ? is a body position angle, the body position angle is an angle between a positive projection line of a connecting line from a mandibular angle to an external acoustic meatus on a symmetrical surface of a human body and the back support plate, and ? is a preset value ranging from 90° to 100°.

Abstract: A motor drive system is provided, which includes an inverter coupled with two terminals of a power supply, where the inverter includes multiple semi-conductive switch elements and is configured to convert a voltage provided by the power supply to an alternating current to drive a motor; a microcontroller coupled with two terminals of the power supply, where the microcontroller has an operation mode and a sleep mode; and a switch body, of which two terminals are respectively coupled with two terminals of the microcontroller, where the switch body is configured to output a response signal to the microcontroller to switch the microcontroller from the operation mode to the sleep mode or from the sleep mode to the operation mode according to the response signal.

Abstract: A motor drive system is provided, which includes: an inverter including an upper-half bridge and a lower-half bridge, the upper-half bridge and the lower-half bridge each including at least two semi-conductive switch elements, where the inverter is configured to convert a voltage provided by a power supply to an alternating current to drive a motor; a microcontroller configured to output a drive signal to the alternately turn on each two of the at least two semi-conductive switch elements of the upper-half bridge and each two of the at least two semi-conductive switch elements of the lower-half bridge when the motor performs braking, whereby a motor winding and the turned-on semi-conductive switch elements form a circuit a capacitor configured to supply power to the microcontroller when the motor performs braking.

Abstract: A motor drive system is provided, which includes: an inverter coupled with two terminals of a power supply, where the inverter includes multiple semi-conductive switch elements and is configured to convert a voltage provided by the power supply to an alternating current to drive a motor; a microcontroller configured to output a drive signal to control an power mode of the semi-conductive switch elements in the inverter; and a rheostat coupled with the microcontroller and configured to provide an input signal to the microcontroller by sliding, where the microcontroller outputs a brake signal to the inverter to control the motor to stop operating when the input signal meets a predetermined condition, and the microcontroller is powered off when the motor stops rotating.

Abstract: A motor control system includes a drive controller and an inverter having two half bridges. When an excitation voltage for a motor is inverted or the motor is freewheeled, the drive controller turns off one semiconductor switch and turns on the other semiconductor switch after delaying for a delay angle in same half-bridge.

Abstract: A motor control system controls power supplying of a motor. The motor control system is configured to control the motor be excited in advance of a zero crossing of a back electromotive force by an advance angle, and the advance angle gradually increases from an acceleration mode to a constant speed operating mode after the motor is started. The motor control system is further configured to control the motor to be excited within a conduction angle, and the conduction angle gradually reduces to a pre-determined value from the acceleration mode to the constant speed operating mode after the motor is started.