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

Claim 10:
11. 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
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,
wherein determining the absolute position of the rotor comprises analyzing only linear portions of signals from the one or more sensors.