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US 4,785,213 AGranted
Variable speed controlled induction motor
AssigneeSatake Engineering Co., Ltd.
InventorToshihiko Satake
Life of this patent
Estimating the term…
Abstract
A variable speed controlled induction 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 rotor 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 excellent torque characteristics and efficiency.
Claims12
A variable speed controlled induction motor comprising:
- a rotor formed in one-piece having a plurality of rotor cores mounted, with a predetermined air space or a non-magnetic core portion being provided therebetween, on a common axis and having a plurality of conductive members interconnected and respectively mounted on said rotor cores;
- a plurality of stators having a plurality of stator cores disposed side by side and surroundingly facing said respective rotor cores and having stator windings wound respectively on said stator cores, said stator windings being connected or coupled in series with respect to a power source;
- connecting members short-circuiting said conductive members at said air space or non-magnetic core portion disposed between said rotor cores;
- and
- phase shifting means for producing phase differences between the voltages induced on the portions of said conductive members which face one of said plurality of stators and the voltages induced on the corresponding portions of said conductive members which face another one of said stators.
2 more elements
A variable speed controlled induction motor comprising:
- a rotor formed in one piece having a plurality of rotor cores mounted, with a predetermined space being provided therebetween, on a common axis and having a plurality of conductive members interconnected and respectively mounted on said rotor cores;
- a plurality of stators having a plurality of stator cores disposed side by side and surroundingly facing said respective rotor cores and having stator windings wound respectively on said stator cores, said stator windings being connected or coupled in series with respect to a power source;
- connecting members short-circuiting said conductive members at an air space or a non-magnetic core portion disposed at said air space between said rotor cores;
- and
- phase shifting means for producing phase differences between the voltages induced on the portions of said conductive members which face one of said plurality of stators and the voltages induced on the corresponding portions of said conductive members which face another one of said stators,
- said phase shifting means being formed by a single-phase transformer and connection switches provided therebetween the respective stator windings of said plurality of stators.
3 more elements
A variable speed controlled induction motor comprising:
- a rotor formed in one piece having a plurality of rotor cores mounted, with a predetermined space being provided therebetween, on a common axis and having a plurality of conductive members interconnected and respectively mounted on said rotor cores;
- a plurality of stators having a plurality of stator cores disposed side by side and surroundingly facing said respective rotor cores and having stator windings wound respectively on said stator cores, said stator windings being connected or coupled in series with respect to a power source;
- connecting members short-circuiting said conductive members at an air space or a non-magnetic core portion disposed at said space between said rotor cores;
- and
- phase shifting means for producing phase differences between the voltages induced on the portions of said conductive members which face one of said plurality of stators and the voltages induced on the corresponding portions of said conductive members which face another one of said stators,
- said phase shifting means being an induction voltage regulator provided between the respective stator windings of said plurality of stators.
3 more elements
A variable speed controlled induction motor comprising:
- a rotor formed in one piece having a plurality of rotor cores mounted, with a predetermined space being provided therebetween, on a common axis and having a plurality of conductive members interconnected and respectively mounted on said rotor cores;
- a plurality of stators having a plurality of stator cores disposed side by side and surroundingly facing said respective rotor cores and having stator windings wound respectively on said stator cores, said stator windings being connected or coupled in series with respect to a power source,
- said stators respectively having windings with a plurality of poles and said windings having terminals to which pole changing switches are connected, enabling the number of poles of the stators to be changed by the operation of said pole changing switches;
- connecting members short-circuiting said conductive members at an air space or a non-magnetic core portion disposed at said space between said rotor cores;
- and
- phase shifting means for producing phase differences between the voltages induced on the portions of said conductive members which face one of said plurality of stators and the voltages induced on the corresponding portions of said conductive members which face another one of said stators.
3 more elements
Dependencies are inferred from the claim text.