PMID- 37488171
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20230727
IS  - 2045-2322 (Electronic)
IS  - 2045-2322 (Linking)
VI  - 13
IP  - 1
DP  - 2023 Jul 24
TI  - A novel spherical ultrasonic motor with wire stators and measuring torque and 
      preload via a new method.
PG  - 11910
LID - 10.1038/s41598-023-39111-8 [doi]
LID - 11910
AB  - The present study introduces a multi-degree-of-freedom (MDOF) ultrasonic motor, 
      which is capable of driving a spherical rotor using spiral wire stators and a 
      piezoelectric stack actuator. Wire stators and piezoelectric stack actuators 
      enable the proposed motor to be smaller and simpler, lower in power consumption, 
      and have different modes at different frequencies. In this motor, two wire 
      stators are used to drive the spherical rotor and rotate it in different 
      directions. The eigenfrequency and frequency domain analyses were carried out 
      using the finite element method (FEM) to evaluate the MDOF capability of the 
      motor in different vibration modes. It has been demonstrated that the 
      piezoelectric stack actuator can provide MDOF motions through its vibration 
      modes. The resonant frequency obtained by the frequency domain approach agreed 
      with the impedance analyzer test. Rotational speed, torque, and preload force 
      were experimentally investigated. Using shear stress caused by viscous fluid in 
      contact with the spherical rotor, a new torque calculation method was developed. 
      Based on the buoyancy force exerted on the immersed rotor, the preload force was 
      measured. The experimental results indicated that the maximum rotational speed of 
      the spherical rotor was 306 rpm, and the maximum torque was 4.7 muN m.
CI  - (c) 2023. The Author(s).
FAU - Jahantab, Seyed Hassan
AU  - Jahantab SH
AD  - Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran. 
      s.jahantab@modares.ac.ir.
FAU - Hojjat, Yousef
AU  - Hojjat Y
AD  - Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran. 
      yhojjat@modares.ac.ir.
FAU - Ghavami Namin, Behzad
AU  - Ghavami Namin B
AD  - Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran.
FAU - Shirkosh, Mohammad
AU  - Shirkosh M
AD  - Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran.
LA  - eng
PT  - Journal Article
DEP - 20230724
PL  - England
TA  - Sci Rep
JT  - Scientific reports
JID - 101563288
SB  - IM
PMC - PMC10366328
COIS- The authors declare no competing interests.
EDAT- 2023/07/25 01:09
MHDA- 2023/07/25 01:10
PMCR- 2023/07/24
CRDT- 2023/07/24 23:21
PHST- 2023/01/14 00:00 [received]
PHST- 2023/07/20 00:00 [accepted]
PHST- 2023/07/25 01:10 [medline]
PHST- 2023/07/25 01:09 [pubmed]
PHST- 2023/07/24 23:21 [entrez]
PHST- 2023/07/24 00:00 [pmc-release]
AID - 10.1038/s41598-023-39111-8 [pii]
AID - 39111 [pii]
AID - 10.1038/s41598-023-39111-8 [doi]
PST - epublish
SO  - Sci Rep. 2023 Jul 24;13(1):11910. doi: 10.1038/s41598-023-39111-8.