Bistable switching method and latching relay using the same

A bistable latching relay comprising:

• a rotor shaft;
• a shell, supporting the rotor shaft;
• a hitting device, disposed on one end of the rotor shaft;
• a cylindrical permanent magnet, covering on the rotor shaft as the form of concentric circle, wherein the cylindrical permanent magnet at least comprises an N magnetism pole and an S magnetism pole;
• a first permeability material, locating in a side of the cylindrical permanent magnet, wherein the first permeability material has a first surface facing to the cylindrical permanent magnet, and the first surface is used to change the magnetic attraction force of different place of the first surface for directing the cylindrical permanent magnet to a first stable position, wherein the magnetic attraction exists between the cylindrical permanent magnet and the first permeability material;
• a second permeability material, locating in the opposite side to the first permeability material according to a center of the cylindrical permanent magnet, wherein the second permeability material has a second surface facing to the cylindrical permanent magnet, and the second surface is used to change the magnetic attraction force of different place of the second surface for directing the cylindrical permanent magnet to a second stable position, wherein the magnetic attraction exists between the cylindrical permanent magnet and the second permeability material;
• a coil, wrapped around the first permeability material and the second permeability material;
• and
• a contact unit, being in an open state or in a closed state according to a movement of the rotor shaft through the hitting device, two ends of the contact unit electrically connecting to each other when the contact unit is in the closed state, the two ends of the contact unit disconnecting to each other when the contact unit is in the open state.

A bistable latching relay comprising:

• an electromagnetic device with a rotor shaft and a shell for supporting the rotor shaft;
• a contact unit;
• a hitting device, disposed on one end of the rotor shaft, wherein the hitting device is disposed on one side of the rotor shaft, and the hitting device rotates following the rotation of the rotor shaft, wherein the hitting device comprises
• a columnar fixed device, covering the rotor shaft and coupling to the shell, and used to offer a moving track to the rotor shaft to slide when rotating and stabilize the bistable latching relay in the open state or in the closed state;
• and
• a first hitting end, coupling to one end of the rotor shaft, being an insulator, and the first hitting end used to touch the contact unit,
• wherein the contact unit being in an open state or in a closed state according to a movement of the rotor shaft through the hitting device, two ends of the contact unit electrically connecting to each other when the contact unit is in the closed state, the two ends of the contact unit disconnecting to each other when the contact unit is in the open state,
• wherein the hitting device rotates to the contact unit and causes the contact unit to be closed when the rotor shaft of the electromagnetic device rotates in a first direction, and the hitting device rotates away from the contact unit and causes the contact unit to be open when the rotor shaft of the electromagnetic device rotates in a second direction,
• wherein the rotor shaft has the moving track, and the hitting device follows the moving track when moving, and the contact unit is closed when the hitting device touches the contact unit according to the moving track, and the contact unit is open when the hitting device moves away from the contact unit according to the moving track.