Abstract:
A rotational difference is generated between a first and a second rotor (28, 78) and a third rotor (18), which causes an induced current to flow in a first rotor winding (30). This causes a torque to act between the first rotor (28) and the third rotor (18). The rotary magnetic field generated by the induced current flowing through a second rotor winding (80) interacts with a second stator (66), which in turn generates an induced electromotive force in a second stator winding (70). The induced electromotive force is applied via a phase adjustment circuit (43) to a first stator winding (20), which generates a rotary magnetic field and causes a torque to act between the first stator (16) and the third rotor (18). The rotary magnetic field generated by the second rotor winding (80) and the induced current flowing in the second stator winding (70) causes a torque to act between the second stator (66) and the second rotor (78).
Abstract:
A rotational difference is generated between a first and a second rotor (28, 78) and a third rotor (18), which causes an induced current to flow in a first rotor winding (30). This causes a torque to act between the first rotor (28) and the third rotor (18). The rotary magnetic field generated by the induced current flowing through a second rotor winding (80) interacts with a second stator (66), which in turn generates an induced electromotive force in a second stator winding (70). The induced electromotive force is applied via a phase adjustment circuit (43) to a first stator winding (20), which generates a rotary magnetic field and causes a torque to act between the first stator (16) and the third rotor (18). The rotary magnetic field generated by the second rotor winding (80) and the induced current flowing in the second stator winding (70) causes a torque to act between the second stator (66) and the second rotor (78).
Abstract:
A rotary electromechanical arrangement has two component rotary electrical machines (1,2) each with multiphase rotor windings (4,6). The rotor phase windings (a,b,c;d,e,f) of each of the component machines are connected together electrically in series in distinct pairs. Each pair comprises a different phase from each of the component machines (1,2). For three electrical phases, the rotor phase windings (a,b,c;d,e,f) at each end of the series connections represent one of the same and opposite directions of rotation. When free-running as a converter, normal stator (5,7) voltages here relative proportionality with applied frequencies. Rotating fields in the stators (1,7) have one of the same and opposite directions of rotation.
Abstract:
Variable speed rotary electrical machines, specifically induction motors and motor drive systems. A main induction motor (15) and an auxiliary induction motor (17) have respective stators (21) housed in a common housing (19) and have respective rotors (23, 27) which are electrically concatenated and mounted on a common shaft (29). The main stator (21) is supplied with a constant a.c. voltage by a main inverter (35) connected to a constant-voltage d.c. link (45,47, 43) and the auxiliary stator is supplied with a variable a.c. voltage by an auxiliary inventor (37) which is forced-commutated and connected to a variable-voltage d.c. link. A controller (40) controls the gating of the inverters (35, 37) and enables the forced-commutated inverter (37) to supply an a.c. signal of selected frequency and voltage level to the auxiliary stator such that a prescribed reactive power will be coupled through the auxiliary and main rotors (27, 23) to the main stator (21) to cause the latter to appear to constitute a leading power factor load, permitting the main inverter (35) to be line-commutated and supplied from a substantially constant voltage d.c. link. Alternatively, a drive system may comprise a plurality of the machines each with a main motor and an auxiliary motor. The stators of the main machines are all supplied from a single common main inverter which is line-commutated and the stators of the auxiliary machines are separately supplied from separate forced-commutated auxiliary inverters.
Abstract:
A rotational difference is generated between a first and a second rotor (28, 78) and a third rotor (18), which causes an induced current to flow in a first rotor winding (30). This causes a torque to act between the first rotor (28) and the third rotor (18). The rotary magnetic field generated by the induced current flowing through a second rotor winding (80) interacts with a second stator (66), which in turn generates an induced electromotive force in a second stator winding (70). The induced electromotive force is applied via a phase adjustment circuit (43) to a first stator winding (20), which generates a rotary magnetic field and causes a torque to act between the first stator (16) and the third rotor (18). The rotary magnetic field generated by the second rotor winding (80) and the induced current flowing in the second stator winding (70) causes a torque to act between the second stator (66) and the second rotor (78).
Abstract:
This invention relates to a variable speed controlled induction motor. The motor has a rotor (8) formed in one-piece and a plurality of stators (24,25), the rotor having a plurality of rotor cores (2,3) and a plurality of conductive members (5) interconnected and the stators having respective stator windings (22,23). The stator windings (22,23) are connected in series, the conductive members (5) are short-circuited by connecting members (r) at an air space or a non-magnetic core portion disposed between the rotor cores (2,3) and at least one of the plurality of stators (24,25) is associated with a phase shifter (38;47;50;51) providing the voltage of a given phase to the stator windings, whereby the rotational speed can be controlled easily over a wide range with the excellent torque characteristics and efficiency being maintained.