Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 8022654 | Soft start for electric motor of a power tool A power tool has an electric motor with field windings. Each field winding includes two coils. When the motor is first energized, the two coils of each field winding are connected in series, reducing in-rush current. Upon expiration of a soft start period, the two c... | 09/20/2011 |
| 6850032 | Methods and apparatus for providing a dual voltage inverter Methods and apparatus for achieving a system, including: a polyphase machine having a plurality of sets of polyphase windings, each of the respective windings of a first of the sets of polyphase windings being inductively linked to one of each of the respective wind... | 02/01/2005 |
| 6768278 | Gas turbine engine starter generator with switchable exciter stator windings A rotating electrical machine, such as an aircraft starter-generator, includes an exciter that has its stator windings divided into a number of sections. A plurality of switches are electrically coupled to the exciter stator winding sections and are configured and c... | 07/27/2004 |
| 6388356 | Methods and apparatus for controlling electromagnetic flux in dynamoelectric machines A method of adjusting speed and torque of a dynamoelectric machine is disclosed. The machine includes a main winding, and a divided winding each configured to generate a plurality of poles. The method includes the steps of energizing the main winding and ... | 05/14/2002 |
| 5898280 | DC shunt (or compound) motor pair capable of synchronous operation A pair of DC motors, each having a shunt-connected field winding, are interconnected such that current supplied to the shunt field winding of one of the motors is proportional to the armature current in the other of the two motors when the speed of the ot... | 04/27/1999 |
| 5569992 | DC shunt (or compound) motor and its related circuit with controllable dynamic characteristics A DC shunt or compound motor, in which an armature current detection device, provided to increase the current in the shunt field winding following an increase in armature load current, causes the motor to have characteristics similar to a series motor unt... | 10/29/1996 |
| 5453673 | DC motor with auxiliary exciting power supply for switching-on series (or compound) start of shunt normal operation according to the load A motor control circuit includes a series motor made up of a series field winding serially connected with an armature or a compound motor having both a series field winding and a shunt field winding. The series field winding is parallel connected to an au... | 09/26/1995 |
| 4080556 | Compound D.C. electrical motor with shunt field demagnetization protection A DC electrical motor of the form having one field winding connected in series with the armature winding in addition to a shunt field winding connected in parallel with the armature winding is provided with a diode or the like in the shunt field winding c... | 03/21/1978 |
