Patent ID: 8058757
Filing Date: 2011-11-15
Classification: F16D,H02K

Abstract:
1. An electric motor with passive integral brake, comprising: a stator comprising one or more magnetic field controllable coils; a rotor comprising a rotor shaft positioned within an inner diameter of the stator, the rotor operable to rotate about a longitudinal axis of the rotor shaft; and a brake shoe having a friction material thereon, the brake shoe positioned within the inner diameter of the stator along the longitudinal axis of the rotor shaft, the brake shoe operable to apply a braking force to the rotor shaft through the friction material and remove the braking force from the rotor shaft responsive to a magnetic field strength produced by the one or more magnetic field controllable coils; wherein the entire brake shoe is positioned within the inner diameter of the stator between the stator and the rotor shaft; and wherein one or more springs coupled to the brake shoe passively applying the braking force between the brake shoe and the rotor shaft absent the magnetic field strength exceeding a threshold level to attract the brake shoe to the inner diameter of the stator; and wherein a second brake shoe separate from and positioned opposite the brake shoe across the rotor shaft, the second brake shoe positioned within the inner diameter of the stator along the longitudinal axis of the rotor shaft, wherein the brake shoe and the second brake shoe are coupled to one or more pivots.