Magnetic brake and electromechanical braking device with a magnetic brake

In an electromechanical wheel braking device (44) for a motor vehicle, having an electric motor (64), a non-self-locking actuating device (52, 66, 68) which is drivable by the electric motor (64) and which converts a rotating driving motion of the electric motor (64) into a translational motion, a friction brake lining (48), which can be pressed against a brake body (50), connected to a vehicle wheel in a manner fixed against relative rotation, by driving the actuating device (52, 66, 68) by means of the electric motor (64) of the actuating device (52, 66, 68),

• an electromechanical braking device (44) for the electric motor (64) and thus the wheel braking device (44), comprising:
• a magnetic brake (10), which has a first electromagnet (18, 20) for its actuation and de-actuation, wherein the brake has two stable positions, a braking position and a non-braking position, wherein, in its braking position it brakes the electric motor (64), and in its non-braking position it allows the electric motor (64) to turn,
• a first power supply for the first electromagnet which supplies the first electromagnet with current of either of two polarities, wherein current of one polarity causes the brake to move to its braking position, and current of the second polarity moves the brake to its non-braking position,
• the magnetic brake (10) also including a second electromagnet (18, 22) which functions independently of the first electromagnet (18, 20), to also position the brake in either of its braking or non-braking positions, and
• a second power supply which supplies current to the second electromagnet (18, 22) with current of either of two polarities, wherein current of one polarity causes the brake to move to its braking position, and current of the second polarity causes the brake to move to its non-braking position.