SINGLE AND POLYPHASE ELECTROMAGNETIC INDUCTION MACHINES HAVING REGULATED POLAR MAGNETIC SYMMETRY

摘要

An induction motor includes a stator (ST1) having at least one pair of stator windings (WA, WB) and a rotor (RO1) with rotor windings (WC) which are magnetically coupled to the stator windings (WA, WB) via a circumferential air gap (AG). The rotor windings (WC) are connected together in a squirrel cage or a wound rotor Δ configuration. The stator windings (WA, WB) are connected in series across the source. A capacitor (CB) is connected in parallel with one of the stator windings (WB) and this combination is connected in series with the other stator winding (WA) and is sized to form a quasi-double-resonant circuit, i.e., a quasi-parallel resonant circuit with the one winding (WB) and a quasi-series resonant circuit with the other winding (WA). The stator windings (WA, WB) are then grouped to form definite polar areas in the stator (ST1) and a balanced rotating magnetic field is produced by all the windings (WA, WB) throughout the entire load range when the motor is connected to a power source. Both a single-phase and a polyphase motor can be configured as a quasi-double-resonant circuit with respect to each input power phase. A further polyphase motor is also described with primary stator windings (WAa, WAb, WAc) connected to each power phase input and inter leaved secondary stator windings (WBa, WBb, WBc) magnetically coupled to the primary stator windings (WAa, WAb, WAc) but not directly connected to the power inputs. The secondary stator windings (WBa, WBb, WBc) have capacitors (CBa, CBb, CBc) coupled in parallel thereto to form parallel floating resonant circuits. In all of these motors, the power factor is in the range of .96 to 1.00, but normally closer to unity due to the resonant behavior of the circuitry. The induction motor can be driven above synchronous speed to act as a generator. Also, a method of generating torque is described.