US 11,754,084 B2
Motor drive control device using feedback speed control and motor current control
Masato Aoki, Iwata (JP); Yuji Omura, Shizuoka (JP); and Takahiro Suzuki, Fukuroi (JP)
Assigned to MINEBEA MITSUMI Inc., Nagano (JP)
Filed by MINEBEA MITSUMI Inc., Nagano (JP)
Filed on Mar. 2, 2020, as Appl. No. 16/805,975.
Claims priority of application No. 2019-038257 (JP), filed on Mar. 4, 2019; and application No. 2019-038258 (JP), filed on Mar. 4, 2019.
Prior Publication US 2020/0284266 A1, Sep. 10, 2020
Int. Cl. F04D 27/00 (2006.01); F04D 25/06 (2006.01); H02P 29/04 (2006.01); F04D 29/66 (2006.01); F04B 49/06 (2006.01)
CPC F04D 27/004 (2013.01) [F04D 25/06 (2013.01); H02P 29/045 (2013.01); F04B 49/065 (2013.01); F04B 2203/0201 (2013.01); F04B 2203/0209 (2013.01); F04B 2203/0211 (2013.01); F04D 29/66 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A motor drive control device comprising:
a control circuit for generating a drive control signal for controlling a rotational speed of a motor based on a speed command signal indicating a target rotational speed of the motor; and
a motor driving unit for driving the motor based on the drive control signal, wherein the control circuit performs speed feedback control for generating the drive control signal so that the rotational speed of the motor coincides with the target rotational speed when the target rotational speed is lower than a rotational speed threshold value, and generates the drive control signal based on a relationship between current flowing through the motor and a reference current value when the target rotational speed is higher than the rotational speed threshold value,
wherein the reference current value is a target current value to be calculated in association with the rotational speed of the motor, the control circuit calculates the target current value using the actual rotational speed, and the control circuit performs maximum air volume control for generating the drive control signal so that the current flowing through the motor approaches the target current value when the target rotational speed is higher than the rotational speed threshold value.