Drive control device, electrical apparatus and drive control method

摘要

A drive control device is provided with a physical amount detection unit which detects the physical amount pertaining to the output of a motor, a rotational frequency determination unit for determining whether the rotational frequency of the motor is equal to or greater than a base rotational frequency, a threshold value selection unit for selecting a threshold value for the physical amount in accordance with the determination result of the rotational frequency determination unit, and a rotational frequency control unit for controlling the rotational frequency of a rotating shaft in accordance with the magnitude relationship between the detected physical amount and the selected threshold value.

主权项

1. A drive control device for controlling drive of an electrical apparatus, which includes a rotor provided on a rotating shaft rotated by an electric motor driven by an inverter for converting a frequency of an AC power supply, comprising:
a physical amount detection unit for detecting a plurality of physical amounts pertaining to an output of the electric motor; a storage unit for storing threshold values for the physical amounts; a rotational frequency determination unit for determining whether or not a rotational frequency of the electric motor is equal to or greater than a base rotational frequency; a selection unit for selecting a threshold value for each of the physical amounts in accordance with a determination result obtained by the rotational frequency determination unit; and a control unit for controlling a rotational frequency of the rotating shaft in accordance with a magnitude relationship between a physical amount detected by the physical amount detection unit and a threshold value selected by the selection unit; wherein:
the physical amount detection unit detects the output of the electric motor, the selection unit selects a specific power threshold value if the rotational frequency of the electric motor is equal to or greater than the base rotational frequency, and the control unit controls the rotational frequency of the rotating shaft in accordance with a magnitude relationship between the output detected by the physical amount detection unit and the specific power threshold value; orthe physical amount detection unit detects a feature amount pertaining to a torque of the electric motor, the selection unit selects a specific torque amount threshold value if the rotational frequency of the electric motor is not equal to or greater than the base rotational frequency, and the control unit controls the rotational frequency of the rotating shaft in accordance with a magnitude relationship between the feature amount detected by the physical amount detection unit and the specific torque amount threshold value; orthe device further comprises a determination unit that causes the inverter to convert the frequency of the AC power supply to a low frequency lower than the frequency and causes the rotor to perform a prescribed process to determine whether or not the process by the rotor can be performed.