Rotor structure of permanent magnet stepping motor
OwnerShih-Ming Huang, Huo-Chu Chen +1inventors
InventorsShih-Ming Huang, Huo-Chu Chen, Wen-She Huang
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Abstract
A rotor structure of a permanent magnet (PM) stepping motor includes a permanent magnet and two multiple yokes, both of which are stacked together to form a rotor structure with hamburger-like multipolar yoke stacks. The top and bottom layers of each multipolar yoke stacks can be multipolar yokes with a gear shape, forming an NS stack structure with a multipolar magnetic field. This structure has the advantage of a minimized magnetic pole span and a high torque, which cannot be achieved in conventional stepping motors.
Claims13
A rotor structure of a permanent magnet (PM) stepping motor, which comprises:
- an axis;
- a plurality of multipolar yoke stacks, each of which includes an N multipolar yoke, a permanent magnet, and an S multipolar yoke combined as a hamburger-like structure, wherein each N pole of the N multipolar yoke and each S pole of the S multipolar yoke are alternately aligned;
- and
- at least one spacer, sandwiched between each pair of the multipolar yoke stacks.
A rotor structure of a permanent magnet (PM) stepping motor, which comprises:
- an axis;
- and
- a multipolar yoke stack, which including an N multipolar yoke, a permanent magnet, and an S multipolar yoke, wherein the N multipolar yoke and the S multipolar yoke form a multipolar equivalent magnetic field of the permanent magnet.
Dependencies are inferred from the claim text.