Patent ID: 11876479
Assignee: CEPHEID
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for encoding a DC electric motor, the method comprising:
operating a motor by powering a coil assembly of a stator of the motor, the coil assembly having a core of magnetic material and electrical windings, thereby rotating a rotor having an inner magnet ring having a first set of permanent magnets adjacent to the core of magnetic material, wherein the rotor further includes an outer magnet ring having a second set of permanent magnets, and a common ring wherein the first set of permanent magnets are mounted on an inside surface of the common ring defining the inner magnet ring, and the second set of permanent magnets are mounted on an outside surface of the common ring defining the outer magnet ring; and
determining an absolute position of the rotor by:
obtaining, with one or more sensors of the motor, a first signal from the first set of permanent magnets passing by the one or more sensors during rotation of the rotor;
obtaining, with one or more sensors of the motor, a second signal from the second set of permanent magnets passing by the one or more sensors during rotation of the rotor; and
analyzing the first and second signals and correlating to a position of the rotor.