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| Number | Title | Issue Date |
| 7612521 | Motor driving apparatus In a fan motor drive circuit which drives a motor based on a pulse-modulated external control signal, a temperature control signal generator generates a pulse-modulated temperature control signal whose duty ratio changes depending on temperature. A signal synthesize... | 11/03/2009 |
| 7612522 | Motor drive control with a single current sensor using space vector technique A drive system for a three phase brushless AC motor is arranged to optimize the transistor switching pattern to improve power output whilst allowing current measurement in all of the phases using a single sensor. This is achieved by defining voltage demand vectors x... | 11/03/2009 |
| 7170243 | Drive method for brushless motor and drive control apparatus therefor A drive method for a brushless motor and a drive control apparatus therefor, in which control parameters are calculated by revolution number control means or motor current control means in accordance with the deviation between a target value and an actual value, a m... | 01/30/2007 |
| 7118347 | Method for activating an electric motor and a metering pump by supplying predetermined pulse intervals to supply predetermined fluid quantities The methods serves for activating an electric motor of a metering pump with which the fluid quantity (Vnom) to be delivered is set by an external impulse trigger, wherein a predetermined delivery quantity (Vnom) is allocated to each impulse (t)... | 10/10/2006 |
| 6977478 | Method, system and program product for controlling a single phase motor A controller is provided for transitioning a drive signal to a single phase motor between a square wave and pulse width modulation modes, wherein the drive signal is in square wave mode at low motor frequencies and in pulse width modulation mode during normal operat... | 12/20/2005 |
| 4932069 | Elevator motor control An apparatus and method for automatic leveling of elevator cars by controlled DC plugging of AC induction motors. The invention utilizes, in a novel circuit and control arrangement, the external neutral connection of a Y-wound motor design to inject contr... | 06/05/1990 |
| 4742288 | Control system for AC motor/generator of secondary AC excitation type A control system for controlling the load of an AC motor/generator of secondary AC excitation type connected to a power system in parallel to at least a synchronous machine. The AC motor/generator has the secondary excitation winding thereof controlled in... | 05/03/1988 |
| 4032824 | Variable-speed 3-phase drive A variable-speed three-phase drive is disclosed. The drive includes a switchable, undersynchronous converter cascade for driving two mechanically coupled asynchronous motors which have slip ring rotors and which can be connected separately to a three-phas... | 06/28/1977 |
