Electromagnetic system

An electromagnetic system, comprising:

• a magnetic yoke;
• a coil mounted in the magnetic yoke and including a support frame and a wire would on the support frame;
• a lower iron core disposed in a lower portion of the coil and fixed to the magnetic yoke;
• a top plate disposed above the coil and directly fixed to the magnetic yoke, an annular wall of the support frame of coil extending between a top of the coil and a bottom surface of the top plate;
• an upper iron core having a lower portion disposed in the coil and an upper portion extending through the top plate;
• an armature disposed above the top plate and fixedly connected to the upper iron core, a bottom surface of the armature having a plurality of first curved grooves, a top surface of the top plate having a plurality of second curved grooves corresponding to the first curved grooves;
• a magnetic isolation ring, distinct from the support frame of the coil and disposed between the upper iron core and the top plate, and disposed between the bottom surface of the top plate and the top of the coil in a vertical direction parallel to a central axis of the upper iron core, the magnetic isolation ring extending perpendicularly with respect to the central axis of the upper iron core and partially between the annular wall of the support frame and the bottom surface of the top plate, the upper iron core configured to move in the vertical direction with respect to the magnetic isolation ring;
• and
• a plurality of balls each configured to roll in one of the first curved grooves and one of the second curved grooves, each first curved groove has a depth gradually deepening from a first end to a second end of the first curved groove, a force applied on the armature by the ball is inclined to the central axis of the upper iron core to drive the armature to rotate around the central axis, the upper iron core and the lower iron core are disposed in a hollow accommodation space of the support frame, and the magnetic isolation ring is supported on an upper end surface of the annular wall of the support frame opposing the bottom surface of the top plate.

An electromagnetic system, comprising:

• a magnetic yoke including a bottom wall, a sidewall extending a vertically from the bottom wall, and an open end opposite the bottom wall;
• a coil mounted in the magnetic yoke and including a support frame and a wire wound on the support frame;
• a lower iron core disposed in a lower portion of the coil and fixed to the magnetic yoke, the support frame of the coil and the lower iron core arranged directly on the bottom wall of the yoke;
• a top plate disposed above the coil and fixed to the sidewall of the magnetic yoke and closing the open end;
• an upper iron core having a lower portion disposed in the coil and an upper portion extending through the top plate;
• an armature disposed above the top plate and connected to the upper iron core, a bottom surface of the armature having a plurality of first curved grooves, a top surface of the top plate having a plurality of second curved grooves corresponding to the first curved grooves;
• and
• a plurality of balls each configured to roll in one of the first curved grooves and one of the second curved grooves, each first curved groove has a depth deepening from a first end to a second end of the first curved groove, a force applied on the armature by the ball is inclined to a central axis of the upper iron core to drive the armature to rotate around the central axis.