Variable speed pumping-up system

Details Variable speed pumping-up system Variable speed pumping-up system

1988-12-16

1991-06-25

Smith, Leonard E.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

417 53, F04B 4900

Patent

active

050262564

ABSTRACT:
The operation of a variable speed electric driven pump turbine is monitored continuously during pumping to detect the operation point of the pump turbine, and to prevent it from falling into a hump characteristic region, which is recognizable on a graph of total dynamic head versus flow rate. Stalling occurs in the hump characteristic region as a result of a partial reverse flow of the water with respect to the runner. When the operation point of the pump turbine approaches the hump characteristic region, a corrective action is taken that includes increasing the output level of the electric driven pump turbine to increase its rotating speed, temporarily.

REFERENCES:
patent: 4201925 (1980-05-01), Kuwabara et al.
patent: 4253794 (1981-03-01), Kuwabara
patent: 4354800 (1982-10-01), Kuwabara
patent: 4382745 (1983-05-01), Kuwabara et al.
patent: 4474528 (1984-10-01), Yokoyama
patent: 4610599 (1986-09-01), Long
patent: 4694189 (1987-09-01), Haraguchi et al.
patent: 4708594 (1987-11-01), Shinmei et al.
patent: 4754156 (1988-06-01), Shiozaki et al.

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