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"Flight by machines heavier than air is unpractical and insignificant, if not utterly impossible."
Simon Newcomb, astronomer ; Said in 1902, less than two years before the first flight at Kitty Hawk
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| Number | Title | Issue Date |
| 7352141 | Device and method to monitor an apparatus An apparatus for monitoring and control of one or more electric motors, including a motor controller, equipped with a soft starter. The soft starter includes memory for storing operations and event data, as well as a human-machine interface for making the event info... | 04/01/2008 |
| 7081733 | Speed control system of fan motor of air conditioner A speed control system of a fan motor of an air conditioner is disclosed. A speed control system of a fan motor of an air conditioner comprises: an inverter having a power output terminal connected to a single-phase power input terminal of the fan motor which has a ... | 07/25/2006 |
| 7064517 | Motor driving apparatus for use in a dishwasher An apparatus for driving a motor of a dishwasher includes an AC power source, a rectification circuit for converting an AC power from the AC power source to a DC power, an inverter circuit for converting the DC power from the rectification circuit to an AC power, a ... | 06/20/2006 |
| 7014423 | High efficiency air conditioner condenser fan Novel twisted blades with an air foil for use with air conditioner condensers and heat pumps that provide improved airflow efficiency to minimize operating power requirements having an overall diameter across the blades being approximately 19 inches, and approximate... | 03/21/2006 |
| 6522096 | Control circuit for a robot power supply A mechanism controller for controlling power to motors of a mechanism having several motors, such as a robot. Each motor has a resolver for indicating the motor position. A driver unit is associated with each motor to supply power to the motor. Each drive... | 02/18/2003 |
| 6404151 | Electric vehicle drive An electric vehicle drive has an electric machine which can be alternatively driven as a motor or as a generator and has a d.c. connection to which a supply voltage can be applied, from a first energy source and/or a second energy source. The first energy... | 06/11/2002 |
| 6037725 | Two step power output motor An electrical control system for an induction motor for achieving optimum efficiency at both full and partial loads at markedly reduced electrical components costs while maximizing reliability over the range of load, and for achieving a two step motor pow... | 03/14/2000 |
| 5670851 | Power conversion control system for plural electric motors and auxiliary circuit An electric vehicle control system for controlling a plurality of main motors for driving an electric vehicle and an auxiliary circuit. The control system includes a first circuit breaker, and a first main power converter for receiving a DC power for conv... | 09/23/1997 |
| 5113123 | Ring spinning machine A ring spinning machine with various driving systems 10, 12 for driving spindles, driving arrangements, ring rails and the like is regulated in the case of power failure down to a zero revolution range while maintaining preselected revolution relationship... | 05/12/1992 |
| 4556826 | Inching supply torque control In a drive system for a grinding mill the load torque plus frictional torque may increase considerably as a loaded mill is inched from its rest position and will suddenly decrease when the load tumbles or cascades. The applied torque or driving torque mus... | 12/03/1985 |
| 4341982 | Simultaneous independent control system for electric motors A system for simultaneously and independently controlling a plurality of electric motors from a number of dispersed stations. The system operates by transmission of duty cycle modulated selected frequencies superimposed on a DC track voltage on a common p... | 07/27/1982 |
