Motor magnetic brake

A motorized window treatment comprising:

• a roller tube;
• a flexible material that is attached to the roller tube;
• a motor configured to be located within the roller tube, the motor comprising a motor drive shaft defining a motor drive shaft rotational axis in a longitudinal direction, the motor drive shaft configured to rotate the roller tube to adjust the flexible material between a raised position and a lowered position;
• and
• a magnetic brake operatively coupled to the motor drive shaft, the magnetic brake comprising:
• a stationary portion comprising a first stationary member, a second stationary member, and a first plurality of magnets, the first stationary member attached to the second stationary member to define a cavity, wherein the first stationary member comprises one or more of the first plurality of magnets and the second stationary member comprises one or more of the first plurality of magnets;
• and
• a rotating portion comprising a second plurality of magnets, the rotating portion retained within the cavity defined by the attachment of the first stationary member and the second stationary member,
• wherein the first plurality of magnets are configured to repel the second plurality of magnets such that repulsion between the first plurality of magnets and the second plurality of magnets generates a holding torque that prevents the motor drive shaft from rotating when the motor is not driving the motor drive shaft.