US 2022/0021280 A1Published application

Magneto-resistive sinusoidal commutation

AssigneeCool Mechatronics

InventorJordan James McBain

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Abstract

Efficient motor commutation has in the past been challenged by limitations of shaft positioning sensors and a microcontroller's complex algorithms employed to switch an inverter once the shaft's position is inferred. While counter intuitive, this invention purports to do away with the complexities of typical field-oriented control by transferring control back into the analog domain. A magneto-resistive sensor generates precisely the waveform which an inverter would typically generate but with fixed amplitude; therefore, this sensor's output is fed into a voltage-controlled amplifier (VCA) followed by a class-d amplifier then fed to the motor's phases. The effect is to reduce the motor commutation problem to an audio amplifier; a greatly simplified microcontroller can then be used to sample the motor's position and vary a voltage command line to the VCA to achieve speed control.

Claims7

Dependent claims

An apparatus for magneto-resistive sinusoidal commutation comprising:

a stator system;
a rotating shaft that is rotatably mounted within said stator system and has an axis of rotation defined by this rotatable mounting;
one or more rotor magnets having a magnetic field with a magnetic polarization, wherein one or more of said rotor magnets are affixed to said rotating shaft, such that the magnetic polarization of each of said one or more rotor magnets is not parallel with the axis of rotation of said rotating shaft;
one or more stator phases including electromagnets having electrical leads at opposing ends of windings of insulated electrically conductive material with one lead being electrically continuous with the other, wherein one or more of said stator phases are mechanically affixed to said stator system and disposed about said rotor magnets to deliver an electromagnetic force onto said rotor magnets when electric current is applied to said stator phases;
one or more shaft sinusoid generating circuits having output terminals which are supplied by electrical components that generate an electrical signal having sinusoidal form whose instantaneous frequency is commensurate with the instantaneous frequency of the angular displacement of said rotating shaft;
and
one or more amplifying circuits that have:
input terminals and output terminals;
and
circuitry receiving a signal at the input terminals of said amplifying circuits, the form of the signal being amplified and supplied at the output terminals of said amplifying circuits,
wherein:
the leads of one or more of said stator phases are supplied with the output terminals of one of said amplifying circuits;
and
the input terminals of said amplifying circuits are connected to the output terminals of one of said shaft sinusoid generating circuits.

11 more elements

An apparatus for three-phase magneto-resistive sinusoidal commutation comprising:

a stator system;
a rotating shaft that is rotatably mounted within said stator system and has an axis of rotation defined by the rotatable mounting;
one rotor magnet that:
has a magnetic field with a magnetic polarization;
and
is affixed to said rotating shaft such that the magnetic polarization of said rotor magnet is substantially at right angles to the axis of rotation of said rotating shaft;
three stator phases that:
include electromagnets having electrical leads at opposing ends of windings of insulated electrically conductive material with one lead being electrically continuous with the other;
are mechanically affixed to said stator system in a plane at substantially right angles to the axis of rotation of said rotating shaft;
and
are disposed about said rotor magnet, wherein each stator phase is angularly dispersed at substantially one hundred and twenty degrees from the remaining stator phases;
a shaft sinusoid generating circuit having three sets of output terminals which are supplied by electrical components that generate electrical signals having sinusoidal form with an instantaneous frequency that is commensurate with the instantaneous frequency of the angular displacement of said rotating shaft;
and
one or more amplifying circuits having input terminals and output terminals, wherein:
each signal on each the output terminals of said shaft sinusoid generating circuit is substantially phase shifted by one hundred and twenty degrees from the other two;
said amplifying circuits have circuitry receiving a signal at the input terminals of said amplifying circuits, the signal having a form that is amplified and supplied at the output terminals of said amplifying circuits;
the leads of each stator phase is supplied with the output terminals of one of said amplifying circuits;
and
the input terminals of said amplifying circuits are connected to the output terminals of one the output terminals of said shaft sinusoid generating circuit.

16 more elements

Dependencies are inferred from the claim text.