US 11,841,012 B2
Pump system, fluid supply device and method for controlling drive of pump system
Yuta Yoshii, Tokyo (JP); Chikara Sekiguchi, Tokyo (JP); Shigenori Inamoto, Tokyo (JP); Yuki Takahashi, Tokyo (JP); Daisuke Kodama, Tokyo (JP); and Daisuke Kurita, Nagano (JP)
Assigned to MINEBEA MITSUMI INC., Nagano (JP)
Filed by MINEBEA MITSUMI INC., Nagano (JP)
Filed on Dec. 20, 2021, as Appl. No. 17/645,270.
Claims priority of application No. 2020-218021 (JP), filed on Dec. 25, 2020.
Prior Publication US 2022/0213887 A1, Jul. 7, 2022
Int. Cl. F04B 49/06 (2006.01); F04B 17/03 (2006.01)
CPC F04B 49/06 (2013.01) [F04B 17/03 (2013.01); F04B 2203/0202 (2013.01); F04B 2205/06 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A pump system, comprising:
a vibration actuator which can be electromagnetically driven by applying an alternating-current voltage thereto;
a sealed chamber connected to a suction port and a discharge port;
a movable wall for changing a volume of the sealed chamber;
a cuff to be attached to a measurement target part of a user;
a pressure sensor for detecting pressure in the cuff; and
a control device for controlling drive of the vibration actuator based on the pressure in the cuff detected by the pressure sensor,
wherein the movable wall is displaced due to the drive of the vibration actuator to supply fluid in the sealed chamber into the cuff,
wherein the control device is configured to calculate a target effective value for allowing an amplitude of the vibration actuator to be a target amplitude based on the pressure in the cuff detected by the pressure sensor and control the alternating-current voltage so that an effective value of the alternating-current voltage coincides with the target effective value,
wherein the vibration actuator includes a shaft portion provided in a housing, a movable body supported by the shaft portion so that the movable body can perform reciprocating rotation with respect to the housing, a pair of coil core portions fixed to one of the housing and the movable body, and magnets provided on another of the housing and the movable body so as to respectively face the coil core portions, and
wherein a spring mass system structure for supporting the movable body is constituted of magnetic springs formed by magnetic force acting between the coil core portions and the magnets and fluid springs formed by elastic force of compressed fluid in the pair of sealed chambers.