Title:
MOTOR
Document Type and Number:
Japanese Patent JP2023122945
Kind Code:
A
Abstract:
To provide a motor that has the improved accuracy of estimating the position of a rotor.SOLUTION: A rotor included in a motor according to an embodiment has a rotor core 31 formed of a magnetic substance, a plurality of magnets 33 arranged side by side on the rotor core 31 along the direction of rotation of the rotor, and a plurality of Hall elements arranged on a common mounting surface 41a and can detect the magnetic fields of the magnets 33. The plurality of magnets 33 each have an opposite surface 38 opposite to the mounting surface 41a, and the distance between the opposite surfaces 38 and the mounting surface 41a is constant. The rotor core 31 has an opposite surface 31b opposite to the mounting surface 41a, and has first areas R1 and second areas R2 different from each other in the distance between the opposite surface 31b and the mounting surface 41a. The first areas R1 and the second areas R2 are arranged alternately along the direction of rotation of the rotor. The number of pairs each composed of one first area R1 and one second area R2 adjacent to the first area R1 is determined according to the number of pole pairs of the magnets 33.SELECTED DRAWING: Figure 7
Inventors:
RENKI HIRONORI
KAWADA SHUSAKU
KAWADA SHUSAKU
Application Number:
JP2022026723A
Publication Date:
September 05, 2023
Filing Date:
February 24, 2022
Export Citation:
Assignee:
NIDEC PREC CORP
International Classes:
G01D5/245; H02K11/215; H02K29/08
Attorney, Agent or Firm:
Patent Attorney Tsutsui International Patent Office
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