Permanent magnet generator providing alternating current which has a selected frequency
First Claim
1. A permanent magnet generator for providing alternating current which has a selected frequency comprising:
- a loop assembly and a magnet assembly, one of which is rotatable relative to the other said assembly;
said magnet assembly provided with at least one ring of field magnets which are arranged to provide a circular array of magnetic fields which vary in magnitude from one circumferential position to another;
said loop assembly provided with at least one ring of electrically conductive output loops which are in said magnetic fields and occupy different circumferential positions on the loop assembly, at least a portion of said loop assembly being movable along a displacement path in said magnetic fields to change the position of said output loops with respect to said magnetic fields independently of the relative rotation between said magnet assembly and said loop assembly;
actuator means for providing displacement movement which gives said loop assembly an oscillatory motion having a mechanical oscillation frequency along said displacement path, said mechanical oscillation frequency corresponding to said selected frequency, said rotary motion and said oscillatory motion providing in said loop assembly a raw amplitude-modulated output signal having an amplitude which is modulated as a function of the displacement of said loop assembly and a induced current frequency which is a function of the rotary motion, said induced current frequency being higher than said mechanical oscillation frequency;
a signal processor for converting said raw output signal to an alternating current signal which has said mechanical oscillation frequency.
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Accused Products
Abstract
An electrical generator has at least one rotating ring of field magnets which produce a circular array of magnetic fields, and a ring of generator output coils which are in the magnetic fields. The field magnets are permanent magnets. The generator output coils are movable in a displacement path toward and away from a null position at which they are exposed to zero net flux from the magnetic fields. Movement of the coils by an actuator varies the amplitude of the voltage induced in these coils by the rotating field magnets. The actuator is energized by an alternating current to create a mechanical oscillation of the generator output coils in their displacement path. The coils provide a raw amplitude-modulated signal that has a carrier frequency which is a function of the rotational velocity of the field magnets and a modulation frequency that is proportional to the mechanical oscillation of the generator output coils. The raw output signal is fed to a signal processor which converts it to a final output signal, the frequency of which is equal to the modulation frequency.
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Citations
58 Claims
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1. A permanent magnet generator for providing alternating current which has a selected frequency comprising:
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a loop assembly and a magnet assembly, one of which is rotatable relative to the other said assembly; said magnet assembly provided with at least one ring of field magnets which are arranged to provide a circular array of magnetic fields which vary in magnitude from one circumferential position to another; said loop assembly provided with at least one ring of electrically conductive output loops which are in said magnetic fields and occupy different circumferential positions on the loop assembly, at least a portion of said loop assembly being movable along a displacement path in said magnetic fields to change the position of said output loops with respect to said magnetic fields independently of the relative rotation between said magnet assembly and said loop assembly; actuator means for providing displacement movement which gives said loop assembly an oscillatory motion having a mechanical oscillation frequency along said displacement path, said mechanical oscillation frequency corresponding to said selected frequency, said rotary motion and said oscillatory motion providing in said loop assembly a raw amplitude-modulated output signal having an amplitude which is modulated as a function of the displacement of said loop assembly and a induced current frequency which is a function of the rotary motion, said induced current frequency being higher than said mechanical oscillation frequency; a signal processor for converting said raw output signal to an alternating current signal which has said mechanical oscillation frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A permanent magnet generator for providing alternating current which has a selected frequency comprising:
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a loop assembly and a magnet assembly, one of which is rotatable relative to the other said assembly about an axis of rotation; said magnet assembly provided with at least one ring of field magnets which are arranged to provide a circular array of magnetic fields which vary in magnitude from one circumferential position to another said loop assembly provided with at least one ring of electrically conductive output loops which are in said magnetic fields and occupy different circumferential positions on the loop assembly, at least a portion of said loop assembly being movable along a displacement path in said magnetic fields to change the position of said output loops with respect to said magnetic fields independently of the relative rotation between said magnet assembly and said loop assembly; actuator means for providing displacement movement which gives said loop assembly an oscillatory motion having a mechanical oscillation frequency along said displacement path, said mechanical oscillation frequency corresponding to said selected frequency, said rotary motion and said oscillatory motion providing in said loop assembly a raw amplitude-modulated output signal having an amplitude which is modulated as a function of the displacement of said loop assembly and a induced current frequency which is a function of the rotary motion, said induced current frequency being higher than said mechanical oscillation frequency; said actuator means including an electrical conductor located in a magnetic field, and means for providing a flow of electrical current in said electrical conductor to produce Lorentz forces which move the loop assembly in said displacement path; a signal processor for converting said raw output signal to an alternating current signal which has said mechanical oscillation frequency. - View Dependent Claims (48, 49, 50, 51)
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52. A permanent magnet generator for providing alternating current which has a selected frequency comprising:
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a loop assembly and a magnet assembly, one of which is rotatable relative to the other said assembly; said magnet assembly provided with at least one ring of field magnets which are arranged to provide a circular array of magnetic fields which vary in magnitude from one circumferential position to another; said loop assembly provided with at least one ring of electrically conductive output loops which are in said magnetic fields and occupy different circumferential positions on the loop assembly, at least a portion of said loop assembly being movable along a displacement path in said magnetic fields to change the position of said output loops with respect to said magnetic fields independently of the relative rotation between said magnet assembly and said loop assembly; actuator means for providing displacement movement which gives said loop assembly an oscillatory motion having a mechanical oscillation frequency along said displacement path, said mechanical oscillation frequency corresponding to said selected frequency, said rotary motion and said oscillatory motion providing in said loop assembly a raw amplitude-modulated output signal having an amplitude which is modulated as a function of the displacement of said loop assembly and a induced current frequency which is a function of the rotary motion, said induced current frequency being higher than said mechanical oscillation frequency; a plurality of flexible members which support and guide said loop assembly, each of said flexible members having a stationary portion and a movable portion, said movable portions being fixed relative to said loop assembly and being movable parallel to said displacement path; a signal processor for converting said raw output signal to an alternating current signal which has said mechanical oscillation frequency. - View Dependent Claims (53, 54, 55, 56, 57, 58)
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Specification