ELECTRIC MOTOR HAVING REDUCED FLUCTUATION OF ROTATING FORCE, THREE-PHASE ELECTRIC MOTOR WITH SINUSOIDAL RECTIFIER, CONTROL METHOD FOR THREE-PHASE BRUSHLESS ELECTRIC MOTOR HAVING SINUSOIDAL RECTIFICATION SIGNAL, AND CONTROL METHOD FOR THREE-PHASE BRUSHLESS ELECTRIC MOTOR

摘要

PURPOSE: To suppress fluctuation in the rotating force and torque of a motor by regulating the magnitude of a Hall effect rectification signal thereby controlling the square sum of constant of all polyphase rectification signals. ;CONSTITUTION: A field sensor 14 generates an output voltage proportional to the field strength and a current being fed to a sensor and connected with a square sum correction means 16 and a polyphase motor coil 12. The square sum correction means 16 receives rectification signals from the field sensor 14 and generates the square sum thereof. Subsequently, the square sum correction means 16 generates a correction signal which is delivered to the field sensor 14. Purpose of the correction signal is to sustain the square sum of signals from the field sensor 14 constantly at a predetermined value. The correct signal from the field sensor 14 is modulated by a motor control signal 18 in order to drive a motor. Fluctuation in the rotating force and torque of the motor is suppressed significantly by a corrected rectification signal from the field sensor 14.;COPYRIGHT: (C)1994,JPO