To provide a magnetization method for manufacturing a magnetic encoder capable of detecting an absolute angle with high accuracy.
According to the magnetization method, a magnetizing head is disposed at a position opposite to a circumferential surface of a cylindrical body to be magnetized, and the circumferential surface of the body to be magnetized is multipolar-magnetized with M (M is a natural number equal to or greater than 2) poles. The magnetization method includes the steps of: performing magnetizing operations at least P×M (P is a natural number equal to or greater than 2) times by relatively moving the magnetizing head or the body to be magnetized along a rotational axis of the body to be magnetized while supplying an AC current to the magnetizing head, and relatively rotating the body to be magnetized or the magnetizing head P times or more around the rotational axis of the body to be magnetized; performing an (N+M)th (N is a natural number equal to or greater than 1) magnetizing operation so as to overlap a portion exceeding a half of a circumferential surface region, in a rotational axis height direction, magnetized by an Nth magnetizing operation in the P×M times of magnetizing operations; and performing the (N+M)th magnetizing operation in such a manner that a position of the (N+M)th magnetization is deviated from a position of the N-th magnetization by a central angle of 12 to 20° per displacement for the height of 1 mm in the rotational axis direction.
| JP4691277 | Stress measuring device and stress measuring method |
| JPH06109750 | ROTARY SENSOR |
| JP2504294 | [Title of Invention] Demagnetizer |
| JP2000012331A | 2000-01-14 | |||
| JP2000114042A | 2000-04-21 | |||
| JP2011249565A | 2011-12-08 | |||
| JP2000012331A | 2000-01-14 |
Kenji Doi
Koichiro Matsueda