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8400090 HVAC condenser assemblies having controllable input voltages  
Assemblies for HVAC systems and methods of operating HVAC systems are disclosed, including a method of operating an HVAC system having a condenser motor operatively coupled to a fan and a...
8264280 Load driving circuit  
Detection accuracy of a short circuit state in a load driving circuit is improved thereby operation efficiency of a motor may be enhanced. A gate control circuit 25 turns off NMOS transistors Q1...
7479756 System and method for protecting a motor drive unit from motor back EMF under fault conditions  
A system and method for protecting a motor drive unit from an associated motor includes a motor drive unit protection system. The motor drive unit protection system includes at least one switch...
7023150 Drive device  
A hybrid drive apparatus includes an engine, a first electric motor for generating electric power by using at least a portion of its output and for controlling the speed of the engine and a control...
6933701 Control apparatus for synchronous motor  
In a control apparatus for a synchronous motor, a coordinate converter converts a detected current into a current on rotational biaxial coordinates (d-q axis). A current controller outputs a...
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...
5598079 A.C. induction devices having tuned compound windings  
The present invention is applicable to any a.c. electromagnetic reduction device which is used to change voltage or current levels or to transfer energy between mechanical and electrical systems...
4928051 Electric motor  
An electric motor has a rotor and a stator each of which is provided with a polyphase winding. The rotor and stator have the same number of poles but the number of phases in the winding of the...
4652807 Starting method for induction motors  
An induction motor starting method comprises the steps of supplying a predetermined low-frequency current to the primary winding of an induction motor through a first cycloconverter having its...
4149114 Induction motors having squirrel cage rotors analogous to commutator motors  
This invention presents several meters characterized by a novel stator structure having distinct and separated energizing and exciting windings and provided with squirrel cage rotors of...
4001666 Load peak shaver power regulating system  
A power regulating system controlling a flywheel-type load peak shaver is described wherein average power to a cyclic load is continuously subtracted from instantaneous load power to provide a...
3611082 VARIABLE SPEED ELECTRIC MOTOR SYSTEM HAVING STATOR AND ROTOR WINDINGS ENERGIZED IN OPPOSITE PHASE SEQUENCE WITH ALTERNATING CURRENT CORRESPONDING IN ANGULAR VELOCITY TO ONE-HALF THE ANGULAR VELOCITY OF THE ROTOR  
The motor system utilizes a conventional wound rotor induction motor but achieves operating characteristics similar to those of a series field direct current motor. Both the stator coils and the...
3586935 SPEED REGULATING AND CONTROL SYSTEM FOR PLURAL-PHASE-WOUND-ROTOR INDUCTION MOTORS  
A motor control system for controlling the speed of a three-phase wound-rotor induction-type electric motor. Silicon controlled rectifiers are connected in circuit with the rotor windings of the...
3543518 ARRANGEMENTS COMBINING A PLURALITY OF PRIME MOVER POWERS  
3519909 ADJUSTABLE SPEED MOTOR DRIVE USING A WOUND ROTOR OF AN INDUCTION MOTOR MECHANICALLY CONNECTED TO THE ARMATURE OF A D.C. MOTOR,BOTH ELECTRICALLY CONNECTED BY A CONTROL SYSTEM  
2858494 Dynamic braking of dynamo electric machines  
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