Please select the most similar patent number from A, B, C and D. Which number is?
A wheel-track magnetic suspension vehicle system comprises a U-shaped channel and a magnetically-suspended vehicle therein. Arranged at the bottom of the U-shaped channel are two permanent magnet roadbeds (8, 22) and one wheel roadbed (20). Provided on the two permanent magnet roadbeds (8, 22) is a permanent magnet A (7, 21); the magnetically-suspended vehicle comprises a compartment body, a chassis, a front drive wheel (4), and a rear drive wheel. Two sides of the chassis are provided with a permanent magnet B (6, 19). Permanent magnet B (6, 19) and permanent magnet A (7, 21) are vertically aligned and have the same polarity. The front drive wheel (4) and rear drive wheel are arranged on the wheel roadbed (20). The two sides of the top part of the U-shaped channel are equipped with power supply line banks (2, 15). The two sides of the compartment body are equipped with power pickup cables (1, 14). Said power pickup cables (1, 14) contact the power supply line banks (2, 15) and provide power to the magnetically-suspended vehicle. The invention also comprises the application of the wheel-track magnetic suspension vehicle system.
A: Disclosed are a stiffness gain mechanism (23) for a magnetic suspension bearing (20), a magnetic suspension bearing (20) comprising the stiffness gain mechanism (23), and a blood pump. The magnetic suspension bearing (20) comprises a stator (21) with stator teeth (211) and a rotor (22) arranged in the stator (21). The stiffness gain mechanism (23) comprises: a rotor permanent magnet (231), a stator permanent magnet (232), and an axial dynamic body (233). The rotor permanent magnet (231) and the rotor (22) of the magnetic suspension bearing (20) form a rotor assembly, and the rotor assembly has an asymmetric structure relative to a main plane (P) of the rotor (22); and the stiffness gain mechanism (23) is configured such that the stator permanent magnet (232) produces a radial attraction on the rotor permanent magnet (231), the axial dynamic body (233) produces an axial repulsive force on the rotor permanent magnet (231), and the magnitude of the axial repulsive force is able to change with the change of the axial distance between the axial dynamic body (233) and the rotor permanent magnet (231). The stiffness gain mechanism (23) can increase the torsional stiffness of the rotor (22) of the magnetic suspension bearing (20) and contribute to the miniaturization of the magnetic suspension bearing (20).
B: An electromagnetic levitation train track system and a levitation electromagnet (9), belonging to the field of railway transport, involve an economical and efficient high-speed electromagnetic levitation train track technical solution, characterized in that tracks (5) are arranged on two sides of a railbed (1) or a track beam, a magnetic levitation train (20) runs on the tracks, traction guide electromagnets (22) are horizontally arranged on support arms (19) on two sides of the magnetic levitation train, the magnetic pole directions of the traction guide electromagnets are horizontally arranged, linear electric motor stators (13) are horizontally arranged at the positions, corresponding to the traction guide electromagnets, of the tracks, each of the linear electric motor stators is composed of a stator coil (16) and a stator iron core (15), the magnetic pole directions of the stator iron cores are horizontally arranged, working faces of the traction guide electromagnets and working faces of the stator iron cores are arranged in parallel and spaced by a certain magnetic gap to form iron core linear electric motors, the levitation electromagnet is arranged at the bottom of the magnetic levitation train, and armature plates (6) are horizontally arranged at the positions, located above the levitation electromagnet, at the bottom of the tracks with a certain magnetic gap apart. The effects of simplified structure, good levitation stability, high levitation capacity and low electromagnetic resistance are achieved.
C: Disclosed is an axial permanent magnetic suspension bearing having micro-friction or no friction of the pivot point, comprising a support bearing (4) provided on a shaft serving as vertical, and a permanent magnetic suspension bearing (3) provided on the vertical shaft. The permanent magnetic suspension bearing (3) comprises a stator pull-push magnet (31) provided on a stator (1) and a rotor pull-push magnet (32) correspondingly provided on a rotor (2) by means of a soft magnetic material base (322) and axially separated from the stator pull-push magnet (31) to form a pull-push magnetic circuit. The stator pull-push magnet (31) and the rotor pull-push magnet (32) are respectively composed of two or more than two annular permanent magnets provided as radially closely fitting and with magnetic poles alternating in the radial direction, and upper and lower annular permanent magnets correspondingly in the same radial position have the same magnetic strength and inverse polarity. The stator pull-push magnet (31) and the rotor pull-push magnet (32) are radially spaced from the surface of the vertical shaft near an annular surface of the annular permanent magnets of the vertical shaft that is near the vertical shaft. The present invention has small magnets, is good to manufacture, is good to install, and has a high radial restoring force, while the force of attraction is great and frictional force is reduced by 98%.
D: A mixed-type magnetic levitation thrust bearing, the mixed-type magnetic levitation thrust bearing comprising a ring-shaped central iron core (1) and outer iron cores (2) disposed at two ends of the central iron core (1), an end of an outer iron core (2) facing the central iron core (1) being provided with a ring-shaped groove (3), each ring-shaped groove (3) having disposed therein an excitation winding, and the central iron core (1) having embedded therein a permanent magnet (4); the mixed-type magnetic levitation thrust bearing can decrease bearing dimensions, lowering production costs.
Answer: B