Embodiments of this application provide example photoelectric scanning apparatuses, motors, and autonomous vehicles. One example photoelectric scanning apparatus includes a motor, a wireless transmission assembly, and an environment detection apparatus. The motor includes a stator, a rotor, and a base, the stator is fixedly mounted on the base, and the rotor is sleeved on the stator. The wireless transmission assembly includes a first coil and a second coil, the first coil and the environment detection apparatus are both mounted on the rotor, the first coil is electrically connected to the environment detection apparatus, the second coil is mounted on the base, and the second coil is electrically connected to a control host. At least one of wireless signal transmission or wireless power transmission is implemented between the control host and the environment detection apparatus through magnetic coupling between the first coil and the second coil.

A resolver includes a first assembly having transmitter windings and a first winding of a first transformer. The resolver also includes a second assembly having receiver windings, a first winding of a second transformer, and a first winding of a third transformer. A third assembly of the resolver includes a second winding of the first transformer, a second winding of the second transformer, and a second winding of the third transformer. The three assemblies are rotatable relative to each other about an axis. The windings of the first transformer, the windings of the second transformer, the windings of the third transformer, the transmitter windings, and the receiver windings are arranged opposite each other in each case, separated by a radial gap.

Apparatus and associated methods relate to a transformer-less way of demodulating signals generated by a synchro-resolver so as to determine a shaft angle of the synchro-resolver. A first differential output voltage between a first pair of the wye-configured secondary windings is used to generate a first output. A second differential output voltage between a second pair of the wye-configured secondary windings, different from the first pair, is used to generate a second output. The first and second outputs are combined to form a signal quadrature to the first output. The first output and the signal quadrature thereto are used to determine the shaft angle.

Apparatus and associated methods relate to a transformer-less way of demodulating signals generated by a synchro-resolver so as to determine a shaft angle of the synchro-resolver. A first differential output voltage between a first pair of the wye-configured secondary windings is used to generate a first output. A second differential output voltage between a second pair of the wye-configured secondary windings, different from the first pair, is used to generate a second output. The first and second outputs are combined to form a signal quadrature to the first output. The first output and the signal quadrature thereto are used to determine the shaft angle.