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US 6,320,350 B1Granted
Modulation control type of AC machine
OwnerTakashi Takeinventor
Life of this patent
Estimating the term…
Abstract
A modulation control type of AC motor includes a modulator and a modulation motor. The modulation motor has the structure in which a DC field power source of a two-phase synchronous motor is replaced by a load and a DC main magnetic flux is replaced by an alternate main magnetic flux. There is no interference between the frequency of an AC power source and the frequency of a modulation signal. Therefore, the synchronous torque and the rotation speed can be controlled separately and independently. The controllable range is wide.
Claims8
An electric automobile comprising:
- a rotary shaft;
- an AC generator as an AC power source, including an engine driven with a predetermined rotation speed to generate constant AC voltage;
- a mechanical modulator including a modulator rotor, a modulator stator winding, and a modulator rotor winding connected to said AC power source and provided on said modulator rotor, for receiving said AC voltage from said AC power source by said modulator rotor winding, and for generating a multiphase amplitude-modulated voltage from said received AC voltage in said modulator stator winding, said amplitude-modulated voltage having a frequency proportional to the number of rotations of said modulator rotor winding;
- and
- a modulation motor including a motor rotor, a motor stator winding connected to said modulator stator winding, and a motor rotor winding connected to a pair of thyristors thereby constituting an electric load, wherein said motor stator winding generates an alternate rotary magnetic field of an alternate main magnetic flux in response to said multiphase amplitude-modulated voltage from said modulator stator winding, and said motor rotor winding is rotated in response to said alternate rotary magnetic field,
- wherein said rotary shaft is connected to said modulator rotor which is connected to said motor rotor, and
- wherein the modulation frequency is controlled by using synchronous torque generated by said modulation motor.
4 more elements
A pumped storage type power generating plant, including:
- a water turbine;
- a mechanical modulator including a modulator rotor, a modulator stator winding, and a modulator rotor winding connect to an AC Power line and provided on said modulator rotor;
- and
- a modulation AC machine including an AC machine rotor connected to said modulator rotor, an AC machine stator winding connected to said modulator stator winding, and an AC machine rotor winding connected to an electric load,
- wherein when said modulator rotor winding receives AC voltage through said AC power line, said modulator stator winding generates a multiphase amplitude-modulated voltage,
- wherein said AC machine stator winding generates an alternate rotary magnetic field of an alternate main magnetic flux in response to said multiphase amplitude-modulated voltage from said modulator stator winding, and said AC machine rotor winding is rotated in response to said alternate rotary magnetic field so that said water turbine is rotated to pump up water, and
- wherein when said water turbine is rotated by falling water, said AC machine rotor and said modulator rotor are rotated so that AC poser is generated and the generated AC power is supplied onto said AC power line.
4 more elements
A tidal power generating system including:
- a tank having an opening portion such that water in said tank is connected to sea and wave is prevented so as to have a still water plane;
- a water wheel having a rotary shaft and provided at an end portion of said tank on a sea side such that a center axis of said water wheel is provided in alignment with the still water plane;
- wave preventing plates provided at upper and lower portions of said water wheel;
- a mechanical modulator including a modulator rotor connected to said rotary shaft of said water wheel, a modulator stator winding, and a modulator rotor winding connected to an AC power line and provided on said modulator rotor;
- and
- a modulation AC machine including an AC machine rotor connected to said modulator rotor, an AC machine stator winding connected to said modulator stator winding, and an AC machine rotor winding connected to an electric load, and
- wherein when said water wheel is rotated by waves, said AC machine rotor and said modulator rotor are rotated so that AC power is generated and the generated AC power is supplied onto said AC power line.
4 more elements
A vibration reducing apparatus comprising:
- three pairs of spiral screws provided between a building and ground, which vibrates by earthquake, via auxiliary buffer members to have a spatial angle of about 120° between every two pairs so that the building can be uniformly supported;
- three sets of modulation motors connected to an AC power source via plural modulators, in which modulation frequency is controlled by external force, the rotation speed being controlled by the external force and said set of modulation motors moving up and down each of said pairs of spiral screws;
- a main buffer material provided at a central position of the bottom surface of the building between the building and the ground;
- and
- control means for controlling said three sets of modulation motors such that a synthesized inclination direction is coincident with the vibration direction of ground, wherein the spiral screws of each pair are differentially moved up and down such that inclinations of the building in three directions by said three pairs of spiral screws are synthesized,
- each of said modulators having a modulator rotor, a modulator stator winding, and a modulator rotor winding connected to an AC power line and provided on said modulator rotor, said modulator rotor coupled to one of said spiral screws,
- each of said modulation motors having an motor rotor connected to said modulator rotor, a motor stator winding connected to said modulator stator winding, and motor rotor winding connected to an electric load,
- wherein said modulators each is either a single-phase or a three-phase type of modulator, wherein said modulators each is further either a mechanical modulator or a modulation amplifier,
- wherein said modulation motors each is either a single-phase or a three-phase type of motor,
- wherein destructive force to the building by earthquake is made to be canceled by the synthesized inclination.
7 more elements
A modulation AC machine comprising:
- a plurality of mechanical modulators, each of said plurality of mechanical modulators having a modulator stator winding and a modulator rotor winding connected to a three phase AC power source, receiving an AC voltage as a carrier wave voltage from said AC power source by said modulator rotor winding, and generating a multiphase amplitude-modulated voltage from said carrier wave voltage in said modulator stator winding by rotating said modulator rotor winding by external force, said amplitude-modulated voltage having a frequency proportional to the number of rotations of one of said plurality of modulator rotor windings, said modulator stator winding and said modulator rotor winding are provided with an angle difference of 2π/3 in an axis direction of a modulator rotor;
- and
- a modulation AC machine having a plurality of AC machine stator windings and a plurality of AC machine rotor windings, one of said plurality of AC machine stator windings being connected to a corresponding one of said modulator stator windings and having a corresponding AC machine rotor winding connected to an electric load, wherein said plurality of AC machine stator windings generate an alternate rotary magnetic field of an alternate main magnetic flux in response to said multiphase amplitude-modulated voltage from said modulator stator winding, and said AC machine rotor winding is rotated in response to said alternate rotary magnetic field.
A modulation AC machine comprising:
- a plurality of mechanical modulators, each of said plurality of mechanical modulators having a modulator stator winding and a modulator rotor winding connected to a three phase AC power source, receiving an AC voltage as a carrier wave voltage from said AC power source by said modulator rotor winding, and generating a multiphase amplitude-modulated voltage from said carrier wave voltage in said modulator stator winding by rotating said modulator rotor winding by external force, said amplitude-modulated voltage having a frequency proportional to the number of rotations of said modulator rotor winding, said modulator stator winding and said modulator rotor winding are provided to a modulator stator and a modulator rotor depart from each other by 2π/3, respectively;
- and
- a modulation AC machine having a plurality of AC machine stator windings and a plurality of AC machine rotor windings, one of said plurality of AC machine stator windings being connected to a corresponding one of said modulator stator winding and having a corresponding AC machine rotor winding connected to an electric load, one of said plurality of AC machine stator windings and one of said plurality of AC machine rotor windings are provided to an AC machine stator and an AC machine rotor depart from each other by 2π/3, respectively, wherein said plurality of AC machine stator windings generate an alternate rotary magnetic field of an alternate main magnetic flux in response to said multiphase amplitude-modulated voltage from said modulator stator winding, and said AC machine rotor winding is rotated in response to said alternate rotary magnetic field.
A modulation AC machine comprising:
- a modulator having an electric circuitry modulation amplifier connected to a three phase AC power source for generating a modulation wave voltage and for executing amplitude modulation to carrier wave voltage supplied from said AC power source in accordance with said modulation wave voltage to generate a multiphase amplitude-modulated voltage;
- and
- a modulation AC machine having a plurality of AC machine stator windings and a plurality of AC machine rotor windings connected to said modulator and AC machine rotor winding connected to an electric load, one of said plurality of AC machine stator windings and one of said plurality of AC machine rotor windings are provided with an angle difference of 2π/3 in an axis direction of said AC machine rotor, said multiphase amplitude-modulated voltage is supplied to a corresponding one of said plurality of AC machine stator windings, wherein each of said plurality of AC machine stator windings generates an alternate rotary magnetic field of an alternate main magnetic flux in response to said multiphase amplitude-modulated voltage from said modulator, and said AC machine rotor winding is rotated in response to said alternate rotary magnetic field.
A modulation AC machine comprising:
- a modulator having an electric circuitry modulation amplifier connected to a three phase AC power source, for generating a modulation wave voltage and for executing amplitude modulation to carrier wave voltage supplied from said AC power source in accordance with said modulation wave voltage to generate a plurality of multiphase amplitude-modulated voltages which are supplied to a corresponding one of said plurality of AC machine stator windings;
- and
- a modulation AC machine having a plurality of AC machine stator windings and a plurality of AC stator windings connected to said modulator and AC machine rotor winding connected to an electric load and having an angle difference of 2π/3 in one of said plurality of AC machine stator windings and one of said plurality of AC machine rotor windings, wherein said AC machine stator winding generates an alternate rotary magnetic field of an alternate main magnetic flux in response to said multiphase amplitude-modulated voltage from said modulator, and said AC machine rotor winding is rotated in response to said alternate rotary magnetic field.
Dependencies are inferred from the claim text.