Control device for actuator, actuator, valve driving device and control method for actuator
AssigneeMitsubishi Electric Corporation
InventorsSatoshi Kawamura, Kenta Hatano
Life of this patent
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Abstract
A position sensor mounted in an actuator includes a magnetic detecting element for detecting the position of a shaft, and a temperature detecting element for detecting intra-sensor temperature which is used for correction of the temperature characteristics of the magnetic detecting element, the magnetic detecting element and the temperature detecting element being built therein. A control device for the actuator acquires both the temperature-corrected position of the shaft and the intra-sensor temperature from the position sensor, and uses them for control of the actuator.
Claims6
A control device for an actuator, the actuator including a shaft, a direct-current motor for causing the shaft to reciprocate in an axial direction, and a position sensor for detecting a position of the shaft, the control device comprising:
- an acquirer to acquire both the position of the shaft and an intra-sensor temperature, wherein the position of the shaft is temperature-corrected by using intra-sensor temperature detected by a temperature detecting element built in the position sensor and by correcting, on a basis of the intra-sensor temperature, a temperature characteristic of a magnetic detecting element that is built in the position sensor, detects flux density which varies due to a reciprocating motion of the shaft and converts the flux density into the position of the shaft;
- and
- a controller to control the actuator by using both the temperature-corrected position of the shaft and the intra-sensor temperature which are acquired by the acquirer.
A control method for an actuator, the control method comprising:
- in a control device for an actuator, the actuator including a shaft, a direct-current motor for causing the shaft to reciprocate in an axial direction, and a position sensor for detecting a position of the shaft, acquiring both the position of the shaft and an intra-sensor temperature, wherein the position of the shaft is temperature-corrected by using intra-sensor temperature detected by a temperature detecting element built in the position sensor and by correcting, on a basis of the intra-sensor temperature, a temperature characteristic of a magnetic detecting element that is built in the position sensor, detects flux density which varies due to a reciprocating motion of the shaft and converts the flux density into the position of the shaft, and controlling the actuator by using both the temperature-corrected position of the shaft and the intra-sensor temperature which are acquired.
Dependencies are inferred from the claim text.