THREE-PHASE MOTOR DRIVE CIRCUIT AND BRUSHLESS MOTOR DRIVE CIRCUIT

摘要

PPROBLEM TO BE SOLVED: To propose a drive circuit that starts a brushless motor smoothly. PSOLUTION: When the brushless motor is started, an exciting current that generates magnetic field of prescribed revolutions that starts the motor, though asynchronously, is caused to flow into a stator 60. Because a rotor 50 increases its revolutions gradually up to the prescribed revolutions with so-called slip, torque is very weak at a starting time when the difference in the revolutions between the rotor 50 and the magnetic field of the prescribed revolutions is the largest, and the motor is started smoothly without causing vibration to the motor. PCOPYRIGHT: (C)2004,JPO&NCIPI