Patent ID: 8783723

Claim:
A safety belt system comprising: a safety belt for restraining an occupant in a seat; a tongue plate arranged on the safety belt; a buckle detachably engaged with the tongue plate; a belt reel for tightening or loosing the safety belt; an electric motor for driving the belt reel, the motor comprising: a stator; and a rotor rotatably mounted to the stator, the rotor comprising a motor shaft, a commutator fixed to the motor shaft, a rotor core fixed to the motor shaft and rotor windings wound about teeth of the rotor core and electrically connected to segments of the commutator, the rotor windings comprises a plurality of winding units, each winding unit comprising at least two coils, the coils of each winding unit being wound about the same teeth and electrically connected to a same pair of segments, in parallel; a detection unit for detecting whether a predefined event is happening or is imminent; and a controller for controlling the motor based on the detecting result of the detection unit, wherein the rotor windings are arranged in two layers, an inner layer and an outer layer, each winding unit comprises two coils, one of the two coils being arranged in the inner layer, the other one of the two coils being arranged in the outer layer.