Title:
GEAR-TYPE MAGNETIC FLUID-BASED ROTATIONAL SPEED SENSOR AND MANUFACTURING METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2020/238405
Kind Code:
A1
Abstract:
A gear-type magnetic fluid-based rotational speed sensor comprises a housing (10), a gear (20), a plurality of sensing electrodes (30), and a plurality of magnetic sources (40). The housing (10) has a cavity. The gear (20) is provided in the cavity and can rotate inside the cavity. The sensing electrode (30) is provided at an inner wall of the housing (10). There is a gap between the sensing electrode (30) and a tooth tip of the gear (20). The magnetic source (40) is provided at the inner wall of the housing (10), and is used to generate a magnetic field in the gap. A magnetic fluid is filled in the cavity. Since the gear-type magnetic fluid-based rotational speed sensor has a simple and compact structure and components thereof are independent from one another, maintenance and repair can be performed conveniently. Moreover, the sensor utilizes inherent characteristics of a magnetic fluid to enable rotational speed measurement of high speed rotation. Also provided is a manufacturing method of a gear-type magnetic fluid-based rotational speed sensor.
Inventors:
LI XIANG (CN)
YU PENG (CN)
NIU XIAODONG (CN)
YU PENG (CN)
NIU XIAODONG (CN)
Application Number:
PCT/CN2020/082862
Publication Date:
December 03, 2020
Filing Date:
April 02, 2020
Export Citation:
Assignee:
UNIV SOUTHERN SCI & TECH (CN)
International Classes:
G01P3/481
Foreign References:
| CN104459187A | 2015-03-25 | |||
| CN110244075A | 2019-09-17 | |||
| CN209946188U | 2020-01-14 | |||
| CN203909058U | 2014-10-29 | |||
| CN203259538U | 2013-10-30 | |||
| JPH09257512A | 1997-10-03 | |||
| US4192189A | 1980-03-11 |
Attorney, Agent or Firm:
JOHNSON INTELLECTUAL PROPERTY AGENCY(SHENZHEN) (CN)
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