Electricity: motor control systems inventions 08/07

20070201842 - Switched dc electrical machine: A switched DC rotating electrical machine (100) comprising a stator (3), a rotor (2) and switching means (11a, 11b, 18a, 18b), an excitation winding (5) associated with one of the stator (3) or the rotor (2) having a pair of inputs, the excitation winding (5) being adapted to cause magnetization... Agent: Gardner Groff Santos & Greenwald, P.C.

20070201843 - Electric motor controller: The rotational speed of a motor is detected, and stored in a rotational speed memory. The difference between the present rotational speed output and each of plural past rotational speeds stored in the rotational speed memory is calculated in a plural difference calculator. Whether the difference between the present rotational... Agent: Osha Liang L.L.P.

20070189739 - Method & arrangement for commutating an electronically commutated motor: A) after a change of the rotor position signal (182), which change is associated with a change (t_HALL) between two rotor poles and follows a commutation of the motor current (320) through the at least one phase (126) which change is referred to hereinafter as a first pole change, a... Agent: Ware Fressola Van Der Sluys & Adolphson, LLP