| 摘要 |
PURPOSE:To enable to obtain sufficient load torque by calculating the weakening limit value of a field current reference from the speed reference to a speed control system by a field, thereby preventing the excess weakening field. CONSTITUTION:A setter 15 sets the entire motor speed in a common bus section, and speed setters 17, 17',... set the speeds of the individual motors in the section. The outputs of multipliers 19, 19' are used as speed references 23, 23,... of the respective motors. Function generators 20, 20',... respectively input the speed references 23, 23',... and calculate the field current reference weakening limit values 24, 24' by a speed curve. Output limiters 22, 22',... respectively compare the field current references 25, 25' as the outputs of armature current control amplifiers 8, 8',... with the values 24, 24',... as the outputs of the generators 20, 20',... and respectively output small values as the final field current references 26, 26',... to phase controllers 13, 13',.... |
