Adjustable speed brushless a. c. motor

Claim 1

A BRUSHLESS ALTERNATING CURRENT DYNAMOELECTRIC MACHINE HAVING AN ADJUSTABLE SECONDARY IMPEDANCE COMPRISING A STATOR HAVING FIRST AND SECOND MAGNETICALLY SEPARATE AND AXIALLY ALIGNED CORES OF MAGNETIC MATERIAL AND A ROTOR SUPPORTED FOR ROTATION WITHIN SAID STATOR AND HAVING A FIRST CORE OF MAGNETIC MATERIAL MAGNETICALLY ASSOCIATED WITH SAID FIRST STATOR CORE AND A SECOND CORE OF SATURABLE MAGNETIC MATERIAL MAGNETICALLY ASSOCIATED WITH SAID SECOND STATOR CORE, SAID FIRST STATOR CORE HAVING A PRIMARY WINDING ADAPTED TO BE ENERGIZED FROM AN ALTERNATING CURRENT POWER SOURCE FOR PROVIDING A ROTATING FLUX FIELD LINKING SAID FIRST STATOR AND ROTOR CORES, SAID SECOND STATOR CORE HAVING A CONTROL WINDING ADAPTED TO BE ENERGIZED FROM A DIRECT CURRENT POWER SOURCE FOR PROVIDING A UNIDIRECTIONAL STATIONARY FLUX FIELD LIKING SAID SECOND STATOR AND ROTOR CORES AND CONTROLLING THE DEGREE OF SATURATION OF SAID SECOND ROTOR CORE, AND A SECONDARY WINDING COMPRISING CONDUCTORS MOUNTED IN AND EXTENDING GENERALLY AXIALLY OF AND BETWEEN SAID ROTOR CORES AND IN MAGNETIC RELATIONSHIP WITH SAID SECOND ROTOR CORE AND ELECTRICALLY CONNECTED TOGETHER TO PROVIDE A PLURALITY OF CLOSED SECONDARY CIRCUITS WHEREBY THE IMPEDANCE OF THE SECONDARY CIRCUITS VARIES IN ACCORDANCE WITH THE DEGREE OF SATURATION OF SAID SECOND ROTOR CORE.