Statorless gearhead motor

The system of claim [0091]:

• wherein the set of hollow-core coil windings comprises non-ferrous metal wire;
• wherein the slip-ring assembly comprises a slip-ring column:
• extending into the rotor;
• and
• comprising a polymer;
• wherein the wave-generator bearing comprises a ceramic material;
• wherein the flexspline cup comprises titanium;
• wherein the circular-spline comprises the polymer;
• wherein the housing comprises the polymer;
• wherein the non-conductive driveshaft comprises the polymer;
• and
• wherein the first electromagnetic shield comprises a copper alloy.

The system of claim [0091]:

• wherein the housing further defines an optical port adjacent the driveshaft aperture;
• further comprising:
• an optical encoder disk arranged on the non-conductive driveshaft outside of the housing;
• and
• an optical detector facing the optical port and defining a field of view intersecting the optical encoder disk;
• and
• wherein the first electromagnetic shield:
• further extends proximal and around the optical port of the housing;
• and
• is further configured to attenuate propagation of electromagnetic fields, generated by the set of hollow-core coil windings, through the optical port.

The system of claim [0091], further comprising:

• a base:
• comprising a printed circuit board:
• configured to rigidly couple the slip-ring assembly, the circular-spline ring, and the housing;
• comprising a metallic layer:
• forming a second electromagnetic shield;
• electrically coupled to the first electromagnetic shield;
• and
• configured to attenuate propagation of electromagnetic fields, generated by the set of hollow-core coil windings, beyond the base;
• and
• comprising a set of motor control traces;
• and
• a motor driver:
• arranged on the printed circuit board;
• electrically coupled to the slip-ring assembly via the set of motor control traces;
• and
• configured to selectively supply electrical current to the set of hollow-core coil windings, via the set of motor control traces, to generate magnetic dipoles that interact with the magnetic field generated by the magnetic resonance imaging machine to rotate the rotor about the rotor axis.

The system of claim [00112]:

• wherein the housing further comprises a pneumatic port configured to couple to the pneumatic supply line;
• and
• further comprising a first electromagnetic shield:
• comprising a non-ferrous conductive coating extending across a first surface of the housing;
• defining an array of opens configured to interrupt eddy-current loops within the non-ferrous conductive coating;
• extending proximal and around the driveshaft aperture of the housing;
• extending proximal and around the pneumatic port of the housing;
• and
• configured to attenuate propagation of electromagnetic fields, generated by the set of hollow-core coil windings, beyond the housing, through the driveshaft aperture, and through the pneumatic port.

A system comprising:

• a rotor:
• configured to rotate about a rotor axis;
• and
• comprising a set of coil windings configured to generate magnetic dipoles that interact with a magnetic field generated by a magnetic resonance imaging machine to rotate the rotor about the rotor axis;
• a slip-ring assembly:
• coaxial with the rotor axis;
• extending into a center of the rotor;
• and
• comprising a set of slip-rings configured to electrically couple to the set of coil windings;
• a power transmission coupled to the rotor;
• a housing:
• containing the rotor, the slip-ring assembly, and the power transmission;
• and
• defining a driveshaft aperture;
• and
• a non-conductive driveshaft:
• coupled to the power transmission;
• extending through the driveshaft aperture of the housing;
• and
• configured to output torque:
• generated by the set of coil windings interacting with the magnetic field generated by the magnetic resonance imaging machine;
• and
• transmitted from the rotor to the non-conductive driveshaft by the power transmission.

A statorless gearhead motor comprising:

• a rotor:
• configured to rotate about a rotor axis;
• and
• comprising a set of coil windings configured to generate magnetic dipoles that interact with a magnetic field generated by a magnetic resonance imaging machine to rotate the rotor about the rotor axis;
• a slip-ring assembly:
• coaxial with the rotor axis;
• and
• configured to electrically couple to the set of coil windings;
• a power transmission:
• coupled to the rotor;
• and
• configured to output torque:
• generated by the set of coil windings interacting with the magnetic field generated by the magnetic resonance imaging machine;
• and
• transmitted by the rotor into the power transmission;
• and
• a non-ferrous shield:
• arranged about the set of hollow-core coil windings;
• and
• configured to attenuate propagation of electromagnetic fields, generated by the set of hollow-core coil windings, toward the magnetic resonance imaging machine.