# US 12,224,689 B2 · Ventilation blower

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- Number: US 12,224,689 B2
- Document ID: US12224689B2
- Status: Granted
- Kind: B2
- Application number: 18/247,768
- Filed: 2020-12-23
- Published: 2023-11-16
- Granted: 2025-02-11
- Earliest claimed: 2020-12-23
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Kazuhiko Hotta; Takuya Nakamura; Ryota Kurosawa
- Web page: https://patentgrep.com/patent/US12224689B2

## CPC

- H02P 6/08: Arrangements for controlling the speed or torque of a single motor (H02P6/10, H02P6/28 take precedence)
- H02P 27/12: pulsing by guiding the flux vector, current vector or voltage vector on a circle or a closed curve, e.g. for direct torque control
- F04D 25/08: the working fluid being air, e.g. for ventilation
- F04D 27/004: {by varying driving speed}
- H02P 21/0025: {implementing a off line learning phase to determine and store useful data for on-line control}
- H02P 21/22: Current control, e.g. using a current control loop
- F05D 2270/3061: of the working fluid
- F05D 2270/335: Output power or torque
- Y02B 30/70: Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

A ventilation blower includes an inverter main circuit, a motor body driven by the main circuit, a control circuit that controls the main circuit, and a storage device. The storage device stores an angular velocity of a motor rotor and a torque current value at a first operation point at which to obtain a first air volume on a first load characteristic, and the angular velocity and the torque current value at a second operation point at which to obtain a second air volume on the load characteristic, the second air volume being different from the first air volume. The control circuit calculates, from the angular velocities and the torque current values at the first and second operation points, the angular velocity and the torque current value at a third operation point at which to obtain a third air volume on the load characteristic.

## Claims

### Claim 1

A ventilation blower comprising:
an inverter main circuit including a plurality of switching elements to be switched to convert direct-current power into three-phase alternating-current power;
a motor body including a stator and a rotor and to be driven by the inverter main circuit;
a motor control circuit to control the inverter main circuit; and
a memory, wherein
the memory stores an angular velocity of the rotor and a torque current value at a first operation point at which to obtain a first air volume on a first load characteristic, and the angular velocity and the torque current value at a second operation point at which to obtain a second air volume on the first load characteristic, the second air volume being different from the first air volume,
the motor control circuit calculates, from the angular velocity and the torque current value at the first operation point and the angular velocity and the torque current value at the second operation point, the angular velocity and the torque current value at a third operation point at which to obtain a third air volume on the first load characteristic, and
the motor control circuit causes the inverter main circuit to drive the motor body with the angular velocity and the torque current value at the third operation point.

### Claim 2 (depends on 1)

The ventilation blower according to claim 1, wherein
the memory stores the angular velocity and the torque current value at a fourth operation point at which to obtain the first air volume on a second load characteristic different from the first load characteristic, and the angular velocity and the torque current value at a fifth operation point at which to obtain the second air volume on the second load characteristic, and
the motor control circuit calculates, from the angular velocity and the torque current value at the fourth operation point and the angular velocity and the torque current value at the fifth operation point, the angular velocity and the torque current value at a sixth operation point at which to obtain a third air volume on the second load characteristic, and obtains, from the angular velocity and the torque current value at the third operation point and the angular velocity and the torque current value at the sixth operation point, an air volume characteristic that indicates a relationship between the angular velocity and the torque current value.