Patent ID: 9729100
Date: 2017-08-08
CPC Classifications: G01D,H02K,H02P

Claim:
1. A mobile body that moves along a magnetic pole path having a magnetic pole section in which a plurality of pairs of magnetic poles, each including a north pole and a south pole, are arranged, and a magnetic pole missing section in which the magnetic pole is missing, the mobile body comprising: a plurality of linear motors including a first linear motor that is driven by magnetic interaction with a magnetic flux of the magnetic pole path; a first detector which is disposed on one side with respect to the first linear motor in a path direction of the magnetic pole path, and detects a first phase angle in accordance with the magnetic flux of the magnetic pole path; a second detector which is disposed on the other side with respect to the first linear motor in the path direction of the magnetic pole path, and detects a second phase angle in accordance with the magnetic flux of the magnetic pole path; and an estimator which compares a phase difference between the first phase angle and the second phase angle with a reference phase difference, to estimate whether or not the first linear motor is located in the magnetic pole missing section.