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| Number | Title | Issue Date |
| 6628101 | Electronic shorting of wound rotor windings A method for shorting rotor windings in a wound rotor induction machine is disclosed. The method includes the steps of monitoring rotor current for a frequency indicative of a desired steady-state operating condition and electronically shorting the rotor ... | 09/30/2003 |
| 6150776 | Variable frequency motor starting system and method A variable frequency motor starting system has a variable frequency AC power supply for generating an AC power output signal applied to an AC motor. A controller is coupled to the variable frequency AC power supply for producing a control signal for adjus... | 11/21/2000 |
| 5396161 | Temperature compensator circuit for an induction motor The purpose of this invention is to provide secondary resistance low temperature compensation in vector speed control at values that are close to the actual secondary time constant even at startup of the motor wherein the secondary time constant operation... | 03/07/1995 |
| 4812730 | Variable-speed generator/motor system A generator/motor system comprises a generator/motor having a primary winding and a secondary winding installed on the motor rotor coupled to a prime mover/load, a main circuit interposed between a power system and the primary winding of the generator/mot... | 03/14/1989 |
| 4743826 | Pumping-up generator/motor system and method of operation of the same In a pumping-up generator/motor system comprising an induction generator/motor, at least one cyclo-converter connected to the secondary winding of the induction generator motor for controlling the rotational speed of the generator/motor in the motor mode ... | 05/10/1988 |
| 4721898 | Wound rotor motor control A control for a wound rotor induction motor including shorting switches in a secondary resistance network comprises an input comparator with voltage limiting switched by the rotor voltage, a pulse generator responsive to the input comparator to generate v... | 01/26/1988 |
| 4503377 | Variable speed rotary electric machine A variable speed rotary electric machine comprises a stator composed of a stator core and first and second stator windings wound on the stator core, and a cage rotor mounted rotatably within the stator and composed of a rotor core and rotor conductor disp... | 03/05/1985 |
| 4481455 | Method of starting variable-speed induction motor This method of starting a variable-speed induction motor utilizes a speed control of the induction motor by varying the output frequency from a cycloconverter. The method comprises applying an output from the cycloconverter to the secondary winding of the... | 11/06/1984 |
| 4078190 | Control system for regulating the speed of an electric motor including static frequency detector for speed detection and regulation A control system for regulating the torque and speed of an alternating current wound rotor motor used in the traverse drive of an overhead travelling crane comprises an SCR bank controlled by a firing circuit responsive to actuation of an operator-control... | 03/07/1978 |
| 4078189 | Control system for regulating the torque and speed of an electric motor including static frequency detector for speed detection and regulation A control system for regulating the torque and speed of an alternating current wound rotor motor used in the traverse drive of an overhead traveling crane comprises an SCR bank controlled by a firing circuit responsive to actuation of an operator-controll... | 03/07/1978 |
