| 摘要 |
PROBLEM TO BE SOLVED: To save power by controlling actual flow rate without using a valve body, and to reuse energy, while ensuring longterm reliability by eliminating the position sensor.SOLUTION: A power generation unit 306 consisting of a rotor 6 and a stator 7 is provided. The rotor 6 is constituted of a ring 6-1 with a built-in permanent magnet, and an impeller 6-2. The rotor 6 is a turbine 308. Actual flow rate of a fluid flowing through a channel is estimated from the current angular speed of the turbine 308, and the current torque of the power generation unit 306. The torque of the power generation unit 306 is then calculated so that the estimated actual flow rate matches the set flow rate, and the torque of the power generation unit 306 is controlled based on the torque thus calculated and the position of the magnetic pole of the turbine 308. The position of the magnetic pole of the turbine 308 is estimated based on the current phase voltage value and phase current value of the power generation unit 306 and the current winding temperature of the power generation unit 306.SELECTED DRAWING: Figure 3 |
