Electricity: motor control systems inventions 02/09

20090047005 - Driving apparatus for a ceiling fan: A driving apparatus for a DC brushless motor of a ceiling fan is provided. By setting at least one coder and one sensor outside the DC brushless motor, the driving apparatus can sense the position of magnetic poles of the motor for driving the motor. Meanwhile, a controller set with... Agent: Holland & Knight LLP

20090047006 - Fan system and motor control device: A fan system includes a control device and a fan device. The control device has a first node, a rotation speed signal generation circuit and a rotation speed reading circuit. The fan device has a second node, a signal transforming circuit, a motor driving circuit, a motor and a fan.... Agent: Muncy, Geissler, Olds & Lowe, PLLC

20090041440 - Document reading apparatus, document reading method, and program for reading document: The invention provides, as an aspect thereof, an document reading apparatus that includes: a speed calculating unit that calculates a speed related to the rotation of a motor on the basis of a signal that is outputted from an encoder; and a controlling unit that calculates control amount on the... Agent: Edwards Angell Palmer & Dodge LLP

20090034943 - Control circuit for fan operating: A control circuit for fan operating comprises a drive operating circuit, a potential modulating circuit, a comparator and a switch circuit. The drive operating circuit at least has a voltage source, a drive IC, a Hall IC and a motor coil winding, the drive IC is connected with the voltage... Agent: Troxell Law Office PLLC