Title:
超音波モータの制御方法及びそのための測量機
Document Type and Number:
Japanese Patent JP6707394
Kind Code:
B2
Abstract:
Provided are methods for controlling an ultrasonic motor (5, 12) driving a rotary shaft (6, 11) in a surveying instrument (1). In order to reduce noise sounds during low-speed rotation, a ratio of an acceleration period (Ta) as a time of intermittent application of an AC voltage drive signal in a control cycle (TM) is controlled, and a starting time of the acceleration period is either randomly or regularly shifted for each control cycle. Alternatively, frequency reduction by doubling an apparent cycle period (TM') may also be performed.
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Inventors:
Kaoru Kumagai
Satoshi Yanobu
Koji Tetsutaro
Satoshi Yanobu
Koji Tetsutaro
Application Number:
JP2016087805A
Publication Date:
June 10, 2020
Filing Date:
April 26, 2016
Export Citation:
Assignee:
Topcon Co., Ltd.
International Classes:
H02N2/14; G01C15/00
Domestic Patent References:
| JP63110971A | ||||
| JP2007244181A | ||||
| JP2014137299A |
Attorney, Agent or Firm:
Hideto Yagi
Yu Ota
Yu Ota