| 摘要 |
PURPOSE:To obtain the constant output operation of a commutatorless motor by controlling an effective lead angle by the superposing angle with an induced voltage detection signal as a reference and compensating the variation in the magnetic flux due to the transition of the leading angle under the control of the magnetic flux, thereby maintaining the allowable constant angle. CONSTITUTION:A superposing angle computing circuit 28 which inputs the current reference signal I* from a speed control circuit 21, the speed feedback signal w* from an F/V converter 22 and the output signal E from a voltage detector 27 outputs a signal for changing the effective leading angle beta in the superposing angle u. Thus, the allowable angle gamma(=beta-u) becomes constant even if the field is weakened. The output signal I*f from a magnetic flux compensating circuit 29 for controlling the prescribed magnetic flux by detecting a forcing magnification value responsive to the variation in the load upon inputting the current reference signal I* is added to a field current reference signal outputted through a voltage control circuit 30 from the output signal¦E*¦of a function generator 31 inputting the output signal¦E¦of a voltage detector 27 and a speed feedback signal omega*. |
