Magnetic screw propulsion system for elevators

An elevator propulsion system comprising:

• a magnetic propulsion assembly configured for connection to an elevator car, the magnetic propulsion assembly including:
• a magnetic screw having a first magnetic element having a first polarity, the first magnetic element arranged along a first non-linear path along a longitudinal axis of the magnetic screw and a second magnetic element having a second polarity, the second magnetic element arranged along a second non-linear path along the longitudinal axis of the magnetic screw;
• a motor for rotating the magnetic screw about the longitudinal axis to impart motion to the elevator car;
• and
• a brake for stopping rotation of the magnetic screw;
• and
• a stator made from a ferrous material, the stator having a body with an internal cavity, the body including a plurality of poles extending into the cavity, the poles arranged along a pole non-linear path along a longitudinal axis of the stator.

An elevator system comprising:

• an elevator car for travel in a hoistway;
• a magnetic propulsion assembly coupled to the elevator car, the magnetic propulsion assembly including:
• a magnetic screw having a first magnetic element having a first polarity, the first magnetic element arranged along a first non-linear path along a longitudinal axis of the magnetic screw and a second magnetic element having a second polarity, the second magnetic element arranged along a second non-linear path along the longitudinal axis of the magnetic screw;
• a motor for rotating the magnetic screw about the longitudinal axis to impart motion to the elevator car;
• and
• a brake for stopping rotation of the magnetic screw;
• and
• a stator positioned along a length of the hoistway, the stator made from a ferrous material, the stator having a body with an internal cavity, the body including a plurality of poles extending into the cavity, the poles arranged along a pole non-linear path along a longitudinal axis of the stator.

A propulsion system comprising:

• a screw having a first ferrous element, the first ferrous element arranged along a first non-linear path along a longitudinal axis of the screw, and a second ferrous element, the second ferrous element arranged along a second non-linear path along the longitudinal axis of the screw;
• a motor for rotating the screw about the longitudinal axis;
• and
• a stator having a body with an internal cavity, the body including a plurality of first poles having a first polarity extending into the cavity, the first poles arranged along a first pole non-linear path along a longitudinal axis of the stator, the body including a plurality of second poles having a second polarity extending into the cavity, the second poles arranged along a second pole non-linear path along a longitudinal axis of the stator.