• The Transactions of the Korean Institute of Electrical Engineers C
• /
• v.53 no.3
• /
• pp.123-127
• /
• 2004

Mode conversion type ultrasonic rotary motor using bolt tightened Langevin type vibrator was studied. Driving frequency of the motor, displacements and elliptical trajectories at tip of the coupler were simulated by finite element analysis program (ANSYS). Speed and torque of the fabricated motor were measured as functions of input voltage and load. As results, from FEA the driving frequency of 40.8[kHz] and useful elliptical trajectories were found. Fabricated motor rotated clockwise at frequency of 38.2[kHz]. Speed and torque of the motor were increased when the input voltage was increased. Maximum speed, torque and efficiency were 75[rpm], 0.14[Nm] and 6.28[％], respectively.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2000.05b
• /
• pp.53-56
• /
• 2000

Piezoelectric ceramics can provide electro-mechanical transduction with high stresses but low displacement. To obtain larger displacements, several mechanical amplifying structures have been used. High alternating displacements can be obtained using resonant structure. In this paper, we designed a bolt-tightened Langevin type ultrasonic vibrator whose resonant frequency is 50[kHz] and ceramics are multilayered. FEM(Finite Element Methode) was employed to calculate. the resonant frequencies and maximum displacements of designed vibrators. The designed resonant frequency and computer calculated frequencies were coincided. When input voltages were increased, the maximum displacements also rose. As AC voltage was applied, the maximum displacement were shown sinusoidal changes. Terminal input admittance over a frequency range spanning the resonant frequency were calculated. ANSYS was used to find resonant frequencies and calculate displacements of vibrators.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2002.07b
• /
• pp.601-604
• /
• 2002

In this paper bolt-tightened Langevin type vibrator was designed using longitudinal-torsional vibration. These two vibrations make rotary displacement at the end of the vibrator. ANSYS was used to determine shape and dimension of the vibrator in addition to resonant frequency, displacement and stress distribution. This kind of vibrator can be applied for a brakeless and gearless rotary motor which has high torque at low speed.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 2000.04a
• /
• pp.525-528
• /
• 2000

Piezoelectric ceramics can provide electro-mechanical transduction with high stresses but low displacement. To obtain larger displacements, several mechanical amplifying structures have been used. High alternating displacements can be obtained using resonant structure. In this paper, we designed three kinds of the bolt-tightened Langevin type ultrasonic vibrators whose resonant frequencies are 30[kHz], 40[kHz]. FEM(Finite Element Methode) was employed to calculated the resonant frequencies and maximum displacements of designed vibrators. The designed resonant frequencies and computer calculated frequencies were coincided. When input voltages were increased, maximum displacements were also raised. ANSYS was used to find resonant frequencies and calculate displacements of vibrators.