Murata Machinery, Ltd.

Satoshi Hanaka

Tetsuya Shimizu

Yasutake Yamada

Shogo Terada

Tatsuo Ota

Hideki Kubo

A moving body includes: a plurality of linear motors including a first linear motor driven by magnetic interaction with magnetic flux of a magnetic pole path; a position detection sensor configured to detect a position of the moving body; a first electrical angle detection sensor disposed at a position different from the position detection sensor in a path direction of the magnetic pole path and configured to detect an electrical angle of the first linear motor; and a control unit configured to, when one of the position detection sensor and the first electrical angle detection sensor is positioned at a magnetic pole absent section, use the other of the position detection sensor and the first electrical angle detection sensor both to detect a position of the moving body and to detect an electrical angle of the first linear motor.

Mobile body

The present invention enables to obtain an approximate position of a zero crossing point in a shorter time period. A magnetic position sensor detects, with an array in which multiple magnetic detection elements are arranged in a straight line, the zero crossing point at which the magnetic flux density from a pair of magnetic poles is zero in a plane perpendicular to the longitudinal direction of the array. The magnetic detection elements are elements whose output changes in polarity when the direction of the magnetic flux density is inverted, and detect an approximate position of the zero crossing point by reading an output of every k-th magnetic detection element of the array (where k is an integer of 2 or greater). Then, the position of the zero crossing point is detected according to outputs of at least two magnetic detection elements on both sides of the zero crossing point.

Magnetic position sensor and position detecting method

In a linear displacement sensor, two magnets with different polarities define one pitch of a magnetic scale. kn (k is a natural number greater than or equal to 2, n is a natural number greater than or equal to 1) sensor units configured to output a plurality of signals whose period is one pitch and whose phases with respect to the pitch are different are arranged along the magnetic scale in a one-pitch segment. Periodic errors with n periods per pitch of the sensor units are canceled out by averaging the phases from the kn sensor units.

Displacement sensor and displacement detection method

A mobile body moves along a magnetic pole path having a magnetic pole section and a magnetic pole missing section. The mobile body includes a plurality of linear motors, a first detector, a second detector, and an estimator. The plurality of linear motors include a first linear motor. The first detector is disposed on one side with respect to the first linear motor in the path direction of the magnetic pole path, and detects a first phase angle. The second detector 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. The estimator 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.

Mobile body and mobile body system

A mobile body moves along a magnetic pole path. The magnetic pole path includes a first magnetic pole section and a second magnetic pole section. The mobile body includes a detector, a rate changing unit, and a position specifying unit. The detector detects a phase angle in accordance with a magnetic flux of the magnetic pole path. The rate changing unit changes a position conversion rate obtained by associating a phase angle of the magnetic pole path with a position of the magnetic pole path based on the phase angle detected by the detector. The position specifying unit specifies a position of the mobile body along the magnetic pole path based on the phase angle detected by the detector and the position conversion rate changed by the rate changing unit.

Mobile body, mobile body system, and position detecting method for mobile body

A detector detects positions of a moving body in a travel direction at a position shifted from a center of control of travel of the moving body in a direction different than the travel direction of the moving body. Positions of the center of control in the travel direction relative to the output of the detector is stored in a storage unit for at least a curved section of a travel route of the moving body, and the travel of the moving body is controlled by a controller, based on the positions of the center of control read out from the storage unit.

Moving body system and method for controlling travel of moving body

A magnetic sensor array including a plurality of magnetic sensors detects a phase regarding a magnetic pole of a magnetic pole array including magnetic poles of N and S arranged alternately. A pitch identification unit detects a pitch number of the magnetic pole currently being detected by the magnetic sensor array, in the magnetic pole array.

Growing community of inventors

Kyoto, Japan

Satoshi Hanaka