Patent ID: 6157160
Filing Date: 2000-12-05
Classification: H02P

Abstract:
An energisation control system of a switched reluctance motor comprising multiphase coil disposed on a stator,each coil having one end connected, through a first switching element, to a first power supply line of a first potential, said first potential is either high or low potential, and connected to a second power supply line of a second potential, said second potential is either high or low potential and is not the same as the first potential, through a first diode which allows a current flow from the second power supply line to the one end of the coil, andsaid each coil having an opposite end connected, through a second switching element, to the second power supply line and connected to the first power supply line through a second diode which allows a current flow from the opposite end of the coil to the first power supply line,wherein the control system comprises:means for determining a target torque for the switched reluctance motor on the basis of an angle of rotation of a rotor, a rotation speed of the rotor, and an actual current passing through said each coil and the outside;means for determining an energisation on angle, a first energisation off angle, a second energisation off angle and a target value of a current with respect to said each coil on the basis of the target torque and a rotation speed of the rotor; andmeans for turning each of the first and second switching elements on and off, configured toturn off both the first and second switching elements when the angle of rotation is within a section from the second energisation off angle to the energisation on angle,turn on both the first and second switching elements when the angle of rotation is reached at the energisation on angle,turn on either one of the first and second switching elements and turn off the other of the first and second switching elements when the angle of rotation is reached at the first energisation off angle, andturn off both the first and second switching elements when the angle of rotation is reached at the second energisation off angle;wherein the actual value of the current is approximated to the target value by means of alternate repeat such that either of the first and second switching elements is turned on, the other of the first and second switching elements is turned off, and the first and second switching elements are both turned on when the angle of rotation is within a section from the energisation on angle to the first energisation off angle, andeither of the first and second switching elements is turned on the other is turned off when the angle of rotation is within a section from the first to second energisation off angles.