Pumps – Condition responsive control of pump drive motor – By control of electric or magnetic drive motor
Patent
1994-10-05
1996-12-03
Thorpe, Timothy S.
Pumps
Condition responsive control of pump drive motor
By control of electric or magnetic drive motor
417 12, F04B 4906
Patent
active
055802214
ABSTRACT:
This disclosure relates to a liquid supply system including a motor-pump unit designed for installation in a liquid supply such as a well or storage tank. The unit supplies the liquid to a supply pipe, and a pressure sensor connected to the pipe is operable to provide a control signal representative of the liquid pressure in the pipe. The motor is a variable-speed AC motor. A control for the motor is responsive to the control signal and actuates a power circuit to drive the motor at a speed adjusted to maintain the liquid pressure at a substantially constant value. The control circuit further includes means for turning off the power to the motor in the absence of flow through pipe, which does not require a flow sensor. The power circuit comprises a DC link including a rectifier and an inverter. The rectifier is located adjacent the pressure sensor; the inverter may be located adjacent the rectifier and the pressure sensor or in the casing of the motor-pump unit.
REFERENCES:
patent: 2440981 (1948-05-01), Smith
patent: 3013186 (1961-12-01), Jones
patent: 3136924 (1964-06-01), Futral et al.
patent: 3141998 (1964-07-01), Silkman
patent: 3551072 (1970-12-01), Zimmerly
patent: 3685926 (1972-08-01), Blum
patent: 3692430 (1972-09-01), Timmons
patent: 3719860 (1973-03-01), Lawrence
patent: 3855515 (1974-12-01), Hutchins, Jr.
patent: 3985467 (1976-10-01), Lefferson
patent: 4037045 (1977-07-01), Beriger et al.
patent: 4051509 (1977-09-01), Beriger et al.
patent: 4093971 (1978-06-01), Chu et al.
patent: 4102394 (1978-07-01), Botts
patent: 4120019 (1978-10-01), Arii et al.
patent: 4145161 (1979-03-01), Skinner
patent: 4155402 (1979-05-01), Just
patent: 4196775 (1980-04-01), Groh
patent: 4204246 (1980-05-01), Arii et al.
patent: 4225290 (1980-09-01), Allington
patent: 4247260 (1981-01-01), Schonwald et al.
patent: 4257395 (1981-03-01), Wieder
patent: 4281968 (1981-08-01), Akers
patent: 4284943 (1981-08-01), Rowe
patent: 4329120 (1982-05-01), Walters
patent: 4344741 (1982-08-01), Taki
patent: 4396353 (1983-08-01), McDonald
patent: 4397610 (1983-08-01), Krohn
patent: 4433219 (1984-02-01), Dietz
patent: 4442953 (1984-04-01), Miyamoto et al.
patent: 4460355 (1984-07-01), Layman
patent: 4532893 (1985-08-01), Day et al.
patent: 4627243 (1986-12-01), Schaub
patent: 4678404 (1987-07-01), Lorett et al.
patent: 4686439 (1987-08-01), Cunningham et al.
patent: 4733152 (1988-03-01), Allington
patent: 4788448 (1988-11-01), Crowe
patent: 4795314 (1989-01-01), Prybella et al.
patent: 4805118 (1989-02-01), Rishel
patent: 4834624 (1989-05-01), Jensen et al.
patent: 4840068 (1989-06-01), Mayhew, Jr.
patent: 4841404 (1989-06-01), Marshall et al.
patent: 4874294 (1989-10-01), Karg
patent: 4987953 (1991-01-01), Hedstrom
patent: 5015151 (1991-05-01), Snyder, Jr. et al.
patent: 5040126 (1991-08-01), Allington
patent: 5064347 (1991-11-01), LaValley, Sr.
patent: 5092824 (1992-03-01), Connett
patent: 5145323 (1992-09-01), Farr
patent: 5197859 (1993-03-01), Siff
patent: 5238369 (1993-08-01), Farr
patent: 5240380 (1993-08-01), Mabe
patent: 5244350 (1993-09-01), Yang
patent: 5282722 (1994-02-01), Beatty
Franklin Electric Co. Inc.
Thai Xuan M.
Thorpe Timothy S.
LandOfFree
Motor drive circuit for pressure control of a pumping system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Motor drive circuit for pressure control of a pumping system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Motor drive circuit for pressure control of a pumping system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-780917