Permanent magnet generator brakes with dual wedges

A system comprising:

• a permanent magnet generator (PMG) with a generator shaft defining a longitudinal axis;
• a brake system, wherein the brake system includes a brake shaft with a first end operatively connected to the generator shaft for selectively rotating with the generator shaft or braking to slow the generator shaft;
• and
• a shear shaft operatively connected to a second end of the brake shaft axially opposite the first end along the longitudinal axis, the shear shaft being configured for connection to a prime mover for rotation of the generator shaft, and being configured to rotate together with the prime mover and with the brake shaft under normal conditions, and to disconnect the prime mover from the brake shaft if subjected to a predetermined torque;
• wherein the brake system includes a wedge with a first position radially withdrawn from the brake shaft, and a second position radially pressed against the brake shaft for applying braking forces to the brake shaft and to the generator shaft, wherein the brake system includes an actuator operatively connected to the wedge to actuate the wedge from the first position to the second position.