Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 8183814 | Alternating current machine with increased torque above and below rated speed for hybrid electric propulsion systems The machine in accordance with the present disclosure is an AC machine whose pole numbers can be switched (from pole p1 to pole p2), and whose number of series turns per phase N can be switched say from N0=Nrated to N... | 05/22/2012 |
| 7245105 | Single-phase induction motor and method for reducing noise in the same A single-phase induction motor and a method for reducing noise in the same, which can eliminate unbalance between magnetomotive forces of main and auxiliary windings in a stator of the motor, thereby implementing a low noise, low vibration motor, and can also achiev... | 07/17/2007 |
| 7211973 | System and process for utilizing back electromotive force in disk drives A circuit system and process utilizes back electromotive force (BEMF) voltage to assist in safe power down of devices, such as the read/write head in from low factor disk drives or similar devices. The BEMF voltage from a motor device, such as a spindle motor utiliz... | 05/01/2007 |
| 6271639 | Capacitor start single phase induction motor with partial winding starting A motor includes a stator core, a rotor in rotational relationship with the stator core and a main winding on the core. In one form, the main winding includes a 4-pole configuration and an 8-pole configuration and the motor has a 4-pole auxiliary winding ... | 08/07/2001 |
| 6242884 | Dual stator winding induction machine drive A dual stator winding induction machine has two windings with input terminals which are supplied separately with drive power. The two stator windings have a different number of poles to essentially eliminate the magnetic coupling between the two windings ... | 06/05/2001 |
| 6121746 | Speed reduction switch A speed reduction switch for a multiple speed induction motor includes a speed selector switch and a delay element. As the motor is switched from a high speed to a lower speed, the delay element temporarily prevents electrical connection of a motor auxili... | 09/19/2000 |
| 5880571 | Method of and system for controlling a variable speed induction motor A method of and system for controlling an induction motor detects input frequency to the motor and connects windings of the motor in one of a plurality of configurations in dependence upon the detected frequency.... | 03/09/1999 |
| 5736829 | High-speed constant-horsepower motor A high-speed constant-horsepower motor includes a rotor and a stator having a plurality of groups of windings which are separately driven. In one mode of operation, the polarity of the voltage applied to each winding is such that the windings behave as di... | 04/07/1998 |
| 4888533 | Brushless DC motor A brushless DC motor useful as a driving source of a refrigerant compressor of a refrigerating apparatus or a fan. A position detecting means generates a control signal by detecting the terminal voltage on input-output terminals current to three-phase rot... | 12/19/1989 |
| 4567414 | Method and a device for controlling a brush-commutator assembly of an electric machine A method and a device for controlling a brush-commutator assembly of a machine under application of an electrical processing and control unit, by sensing one or more operating parameters of the electric machine, the sensing values being processed and conv... | 01/28/1986 |
