Title:
ELECTRIC MOTOR DRIVE DEVICE
Document Type and Number:
Japanese Patent JP2023040458
Kind Code:
A
Abstract:
To provide an electric motor drive device (10) capable of controlling the rotational speed of an electric motor (2) even when the rotational speed of the electric motor is rapidly reduced or stopped.SOLUTION: Driving power is supplied to an electric motor from a switching power supply (20), and operating power is supplied to a control unit (12) to control the rotational speed of the electric motor. When a voltage value of the driving power is detected and fed back to a duty ratio of a switching power supply to adjust the voltage value of driving power to a specified voltage value, the voltage value of operating power is adjusted to a predetermined voltage value. The control unit can detect that the voltage value of the driving voltage exceeds a threshold voltage value, and executes control for maintaining or increasing the rotational speed of the electric motor when the voltage value of the driving power exceeds the threshold voltage value due to execution of deceleration control of reducing or stopping the rotational speed of the electric motor. This makes it possible to maintain the operating power of the control unit at a predetermined voltage value even when the rotational speed of the electric motor is suddenly reduced or stopped.SELECTED DRAWING: Figure 1
Inventors:
YOSHINO REIMA
Application Number:
JP2021147421A
Publication Date:
March 23, 2023
Filing Date:
September 10, 2021
Export Citation:
Assignee:
RINNAI KK
International Classes:
H02P29/00; H02M3/28
Attorney, Agent or Firm:
Daisuke Mibayashi
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