公开(公告)号：US5197667A

公开(公告)日：1993-03-30

申请号：US643180

申请日：1991-01-18

Applicant: Benjamin Bowsky ,  Jerry D. Lloyd ,  Bernard Brown ,  Pradeep K. Sood

Inventor： Benjamin Bowsky ,  Jerry D. Lloyd ,  Bernard Brown ,  Pradeep K. Sood

IPC: F24F11/04 ,  F24F11/00 ,  G05D23/275

CPC classification number: F24F11/0009 ,  G05D23/1909 ,  G05D23/275 ,  F24F11/0012 ,  F24F11/0015 ,  F24F2011/0036 ,  F24F2011/0038 ,  Y10S236/09

Abstract: A field installable device for a conventional heating and air conditioning system (HVAC) is provided which operates a blower fan in conjunction with a standard thermostat. Presently, HVAC systems operate in four modes: heating, cooling, off and fan "on". The device includes a multi-pole, multi-speed motor and a control operatively connected between the thermostat and the motor. With the fan switch in the "on" position and heating or cooling called for, the control causes the blower to operate at a high speed, which may be different for heating or cooling. When the pre-selected temperature is reached the particular thermal operation (i.e., heating or cooling) is stopped. The control switches the motor to a speed substantially slower than the operating condition speed to provide continuing air circulation until the thermostat again calls for thermal operation. With the switch in "auto" position, the blower operates similarly to present systems.

公开(公告)号：US5177054A

公开(公告)日：1993-01-05

申请号：US682447

申请日：1991-04-08

Applicant: Jerry D. Lloyd ,  Alan D. Crapo

Inventor： Jerry D. Lloyd ,  Alan D. Crapo

IPC: H02K3/02 ,  H02K15/03 ,  H02K23/00 ,  H02K55/00 ,  H02K55/04

CPC classification number: H02K15/03 ,  H02K55/04 ,  Y02E40/625

Abstract: A motor (10) comprises a stator (14) having an associated stator winding (24) formed of a conventional material such as copper, or of a superconductive material. A rotor (12) for the motor is also formed of a superconductive material. The rotor is placed in a cryostat (16) and cooled from a first temperature which is above a critical level to a second temperature which is below the level. The stator is placed in a second and separate cryostat (18) and the stator winding is energized while the rotor temperature is being lowered to below the critical level. Once the superconductive material of the rotor has been cooled to a level below the critical level, the stator winding is de-energized. Currents are now induced in the superconductive material of the rotor to trap or maintain magnetic flux therein. Thereafter, the rotor acts as a permanent magnet so long as it is maintained below the critical temperature.