Direct-current operated synchronous motor

Claim 2

In an electromechanical device, the combination of a ferromagnetic rotor having nonpolarized poles, a magnetic circuit including a pickup coil with a first set of poles and a set of adjacent cooperating rotor poles, a DC source connected with said pickup coil so that each poles of said first set is of fixed polarity and the voltage in said pickup coil pulsates in step with the rotor rotation, another magnetic circuit including a drive coil with a second set of poles other than said first set and another set of adjacent cooperating rotor poles, an amplifier, means electrically connecting said pickup coil with said amplifier to supply an input signal thereto as the rotor rotates, means to supply said drive coil from the output of said amplifier to supply driving impulses to said rotor, with said driven rotor acting to feed energy from said drive coil and its poles back to said pickup coil and its poles, and means supplying to said amplifier electric signals of a controlled frequency to provide input signals at an invariable submultiple of said controlled frequency.

Claim 3

In an electromechanical device, the combination of a ferromagnetic rotor having nonpolarized poles, a mAgnetic circuit including a pickup coil with a first set of poles and a set of adjacent cooperating rotor poles, of which each poles of said first set is of fixed polarity so that a voltage is generated in said pickup coil which pulsates in step with the rotor rotation, another magnetic circuit including a drive coil with a second set of poles other than said first set and another set of adjacent cooperating rotor poles, an amplifier, means electrically connecting said pickup coil with said amplifier to supply an input signal thereto as the rotor rotates, means to supply said drive coil from the output of said amplifier to supply driving impulses to said rotor, with said driven rotor acting to feed energy from said drive coil and its poles back to said pickup coil and its poles, and means supplying to said amplifier electric signals of a controlled frequency to provide input signals at an invariable submultiple of said controlled frequency.

Claim 4

In an electromechanical device, the combination of a ferromagnetic rotor having nonpolarized poles, a mAgnetic circuit including a pickup coil with a first set of poles and a set of adjacent cooperating rotor poles, of which each poles of said first set is of fixed polarity so that a voltage is generated in said pickup coil which pulsates in step with the rotor rotation, another magnetic circuit including a drive coil with a second set of poles other than said first set and another set of adjacent cooperating rotor poles, an amplifier, means electrically connecting said pickup coil with said amplifier to supply an input signal thereto as the rotor rotates, means to supply said drive coil from the output of said amplifier to supply driving impulses to said rotor, with said driven rotor acting to feed energy from said drive coil and its poles back to said pickup coil and its poles, and means supplying to said amplifier electric signals of a controlled frequency to provide input signals at an invariable submultiple of said controlled frequency.

Claim 5

In an electromechanical device, the combination of a rotor having poles, a magnetic circuit including a pickup coil with a first set of poles and a set of adjacent cooperating rotor poles of which each pole of one set is of fixed polarity, another magnetic circuit including a drive coil with a second set of poles other than said first set and another set of adjacent cooperating rotor poles, an amplifier, means electrically connecting said pickup coil with said amplifier to supply an input signal thereto as the rotor rotates, means to supply said drive coil from the output of said amplifier to supply driving impulses to said rotor, with said driven rotor acting to feed energy from said drive coil and its poles back to said pickup coil and its poles, means supplying to said amplifier electric signals of a controlled frequency to provide input signals at an invariable submultiple of said controlled frequency, and means for feeding part of the electric energy supplied to said drive coil back to said pickup coil to produce pulsating electric signals in said coils for exciting said rotor, when idle, into a self-start, with said electric-energy feedback means comprising a secondary coil in inductive relation with said drive coil and electrically connected with said pickup coil.

Claim 6

In an electromechanical device, the combination of a rotor having poles, a magnetic circuit including a pickup coil with a first set of poles and a set of adjacent cooperating rotor poles of which each pole of one set is of fixed polarity, another magnetic circuit including a drive coil with a second set of poles other than said first set and another set of adjacent cooperating rotor poles, an amplifier, means electrically connecting said pickup coil with said amplifier to supply an input signal thereto as the rotor rotates, means to supply said drive coil from the output of said amplifier to supply driving impulses to said rotor, with said driven rotor acting to feed energy from said drive coil and its poles back to said pickup coil and its poles, means supplying to said amplifier electric signals of a controlled frequency to provide input signals at an invariable submultiple of said controlled frequency, and means for feeding part of the electric energy supplied to said drive coil back to said pickup coil to produce pulsating electric signals in said coils for exciting said rotor, when idle, into a self-start, with said electric-energy feedback means comprising a secondary coil in inductive relation with said drive coil and electrically connected with said pickup coil.

Claim 7

In an electromechanical device, the combination of a rotor having poles, a magnetic circuit including a pickup coil with a first set of poles and a set of adjacent cooperating rotor poles of which each pole of one set is of fixed polarity, another magnetic circuit including a drive coil with a second set of poles other than said first set and another set of adjacent cooperating rotor poles, a transistor amplifier with electric base, emitter and collector circuits and a powering DC source, said drive coil is in said collector circuit and said pickup coil is in one of said electric circuits other than said collector circuit, means injecting electric signals of controlled frequency into one of said electric circuits to provide said amplifier with an input signal at an invariable submultiple of said controlled frequency as the rotor rotates, and a secondary coil in inductive relation with said drive coil and electrically connected with said pickup coil for feeding electrical energy from said secondary coil directly to said pickup coil to produce in said drive and pickup coils pulsating electric signals for exciting said rotor, when idle, into a self-start.

Claim 8

In an electromechanical device, the combination of a rotor having poles, a magnetic circuit including a pickup coil with a first set of poles and a set of adjacent cooperating rotor poles of which each pole of one set is of fixed polarity, another magnetic circuit including a drive coil with a second set of poles other than said first set and another set of adjacent cooperating rotor poles, a transistor amplifier with electric base, emitter and collector circuits and a powering DC source, said drive coil is in said collector circuit and said pickup coil is in one of said electric circuits other than said collector circuit, means injecting electric signals of controlled frequency into one of said electric circuits to provide said amplifier with an input signal at an invariable submultiple of said controlled frequency as the rotor rotates, and a secondary coil in inductive relation with said drive coil and electrically connected with said pickup coil for feeding electrical energy from said secondary coil directly to said pickup coil to produce in said drive and pickup coils pulsating electric signals for exciting said rotor, when idle, into a self-start.

Claim 9

In an electromechanical device, the combination of a rotor having poles of two sets of permanent opposite polarities, a magnetic circuit including a pickup coil with a first set of field poles cooperating with the nearest rotor poles of both sets, another magnetic circuit including a drive coil with a second set of field poles other than said first set and cooperating with the nearest rotor poles of both sets, a transistor amplifier with electric base, emitter and collector circuits and a powering DC source, said drive coil is in said collector circuit and said pickup coil is in one of said electric circuits Other than said collector circuit, and means for feeding part of the electrical energy supplied to said drive coil back to said pickup coil to produce pulsating electrical signals in said coils for exciting said rotor, when idle, into a self-start, with said electrical energy feeding means being a secondary coil in inductive relation with said drive coil and electrically connected with said pickup coil.

Claim 10

In an electromechanical device, the combination of a rotor having poles of two sets of permanent opposite polarities, a magnetic circuit including a pickup coil with a first set of field poles cooperating with the nearest rotor poles of both sets, another magnetic circuit including a drive coil with a second set of field poles other than said first set and cooperating with the nearest rotor poles of both sets, a transistor amplifier with electric base, emitter and collector circuits and a powering DC source, said drive coil is in said collector circuit and said pickup coil is in one of said electric circuits Other than said collector circuit, and means for feeding part of the electrical energy supplied to said drive coil back to said pickup coil to produce pulsating electrical signals in said coils for exciting said rotor, when idle, into a self-start, with said electrical energy feeding means being a secondary coil in inductive relation with said drive coil and electrically connected with said pickup coil.

Claim 11

In an electromechanical device, the combination with a rotor having magnetic poles, a magnetic circuit including a pickup coil with a first set of field poles and a set of adjacent cooperating rotor poles of which each pole of one set is of fixed polarity, another magnetic circuit including a drive coil with a second set of field poles other than said first set and another set of adjacent cooperating rotor poles, with the field poles of said sets being angularly coordinated so that the field poles of either set are in alignment with the nearest rotor poles when the field poles of the other set are out of alignment with the nearest rotor poles, an amplifier having output circuitry and controlling circuitry, a power source applying to said amplifier circuitry uninterrupted DC means electrically connecting said pickup coil with said controlling circuitry to supply an input signal thereto as the rotor rotates, means to supply said drive coil from said output circuitry of said amplifier to supply driving impulses to said rotor, and a controlling frequency electrically connected to said controlling circuitry of said amplifier to effect amplification of said controlling frequency in said amplifier and cause operation of said rotor at an invariable submultiple of said controlling frequency.

Claim 12

In an electromechanical device, the combination with a rotor having magnetic poles, a magnetic circuit including a pickup coil with a first set of field poles and a set of adjacent cooperating rotor poles of which each pole of one set is of fixed polarity, another magnetic circuit including a drive coil with a second set of field poles other than said first set and another set of adjacent cooperating rotor poles, with the field poles of said sets being angularly coordinated so that the field poles of either set are in alignment with the nearest rotor poles when the field poles of the other set are out of alignment with the nearest rotor poles, an amplifier having output circuitry and controlling circuitry, a power source applying to said amplifier circuitry uninterrupted DC means electrically connecting said pickup coil with said controlling circuitry to supply an input signal thereto as the rotor rotates, means to supply said drive coil from said output circuitry of said amplifier to supply driving impulses to said rotor, and a controlling frequency electrically connected to said controlling circuitry of said amplifier to effect amplification of said controlling frequency in said amplifier and cause operation of said rotor at an invariable submultiple of said controlling frequency.

Claim 13

In combination with an electromechanical device, having: a rotor having magnetic poles, a magnetic circuit including a pickup coil with a first set of poles and a set of adjacent cooperating rotor poles of which each pole of one set is of fixed polarity, another magnetic circuit including a drive coil with a second set of poles other than said first set and another set of adjacent cooperating rotor poles; an amplifier having input and output circuitry, a power source applying uninterrupted DC to said amplifier, means electrically connecting said pickup coil with said input circuitry to supply an input signal to the amplifier as the rotor rotates, means to supply said drive coil from said output circuitry of said amplifier to supply driving impulses to said rotor, a free running timing oscillator having frequency determining circuitry separate from said device, as well as from said input and output circuitry, said oscillator deriving a continuous wave output of predetermined frequency independent of parameters of the electromagnetic device and said amplifier circuitry, means for applying the oscillator output frequency to the input circuitry of the amplifier, and means connected in circuit with one of the coils for tuning said one coil to a subharmonic of said oscillator output frequency so that the drive coil excites said rotor in response to the subharmonic.

Claim 14

In combination with an electromechanical device, having: a rotor having magnetic poles, a magnetic circuit including a pickup coil with a first set of poles and a set of adjacent cooperating rotor poles of which each pole of one set is of fixed polarity, another magnetic circuit including a drive coil with a second set of poles other than said first set and another set of adjacent cooperating rotor poles; an amplifier having input and output circuitry, a power source applying uninterrupted DC to said amplifier, means electrically connecting said pickup coil with said input circuitry to supply an input signal to the amplifier as the rotor rotates, means to supply said drive coil from said output circuitry of said amplifier to supply driving impulses to said rotor, a free running timing oscillator having frequency determining circuitry separate from said device, as well as from said input and output circuitry, said oscillator deriving a continuous wave output of predetermined frequency independent of parameters of the electromagnetic device and said amplifier circuitry, means for applying the oscillator output frequency to the input circuitry of the amplifier, and means connected in circuit with one of the coils for tuning said one coil to a subharmonic of said oscillator output frequency so that the drive coil excites said rotor in response to the subharmonic.

Claim 15

The combination of claim 7, further including means other than said rotor for feeding part of the electric energy supplied to said drive coil back to said pickup coil to produce pulsating electric signals in said coils for exciting said rotor, when idle, into a self-start.

Claim 16

In combination with an electromechanical device having: a rotor having magnetic poles, a magnetic circuit including a pickup coil with a first set of poles and a set of adjacent cooperating rotor poles of which each pole of one set is of fixed polarity, another magnetic circuit including a drive coil with a second set of poles other than said first set and another set of adjacent cooperating rotor poles, said pickup coil deriving an output wave having a frequency dependent upon the angular velocity of the rotor while the rotor is turning; a free running oscillator, said oscillator having frequency determining circuitry independent of the frequencY derived from the pickup coil for deriving an output wave having a frequency determined by said frequency determining circuitry; means for applying to the drive coil replicas of combined waves derived from the pickup coil and the oscillator; and means connected in circuit with one of the coils for tuning said one coil to a subharmonic of the frequency of the oscillator output wave so that the drive coil excites said rotor in response to the subharmonic.

Claim 17

In combination with an electromechanical device having: a rotor having magnetic poles, a magnetic circuit including a pickup coil with a first set of poles and a set of adjacent cooperating rotor poles of which each pole of one set is of fixed polarity, another magnetic circuit including a drive coil with a second set of poles other than said first set and another set of adjacent cooperating rotor poles, said pickup coil deriving an output wave having a frequency dependent upon the angular velocity of the rotor while the rotor is turning; a free running oscillator, said oscillator having frequency determining circuitry independent of the frequencY derived from the pickup coil for deriving an output wave having a frequency determined by said frequency determining circuitry; means for applying to the drive coil replicas of combined waves derived from the pickup coil and the oscillator; and means connected in circuit with one of the coils for tuning said one coil to a subharmonic of the frequency of the oscillator output wave so that the drive coil excites said rotor in response to the subharmonic.

Claim 18

The combination of claim 9 wherein the tuning means comprises a capacitor connected in shunt with said one coil.