| 摘要 |
PURPOSE:To prevent resping noise by using an inverter-controlled brushless DC motor for a vacuum cleaner, controlling a closed loop speed, correcting a speed command from a load circuit, and delaying the timing of the correction amount. CONSTITUTION:An inverter controller 10 obtains a DC voltage Ed through a rectifier 15 and a smoothing condenser 16 from an AC power source 14, and drives a brushless DC motor 9 through an inverter 20. The speed controller of the motor 9 is composed of a microcomputer 13, a pole position detector 12 for a rotor 9-2, a load current ID detector 17, a base driver 19, a speed command circuit 18, etc. The controller 10 controls the motor 9 by a closed loop current on the basis of a speed command, and, the command is corrected according to load current value of the motor 9. Further, a correction amount corresponding to the load current value is delayed at its timing. Thus, the abrupt change of the rotating speed of the motor 9 can be suppressed. |
