A ball-type multi-DOF ultrasonic motor with three embedded traveling wave stators

Self Cite

Temperature rise has always been one of the main researchfocusesof the motor. When the temperature is too high, it will have a serious impact on the stability and reliability of motor performance. Due to the special structure of electromagnetic piezoelectric hybrid drive motor (EPHDM), the loss and temperature distribution of electromagnetic drive part and piezoelectric drive part werestudied. By analyzing the operation principle of the motor, the loss of each part wasresearched. On this basis, the loss of the electromagnetic driving part and piezoelectric driving part werecomputed by using the coupling iterative calculation method. The temperature contour map of the motor wasanalyzed by simulation, and the temperature characteristics of each part of the motor werestudied. Finally, the experimental verification of the prototype, the reliability of the theoretical model, and simulation results wereproved. The results showed that the temperature distribution of the motor is reasonable, the winding temperature is relatively high, and the core temperature and piezoelectric stator temperature are relatively low. The analytical and experimental methods are provided for the further study of heat source optimization.

Section: Piezoelectric Driving Principlementioning

confidence: 99%

Temperature Characteristic Analysis of Electromagnetic Piezoelectric Hybrid Drive Motor

Chen

Zhao

et al. 2022

Self Cite

“…As shown in Figure 5, it runs at the maximum speed Vmax at point b, and runs at the minimum horizontal speed Vmin at the contact end x = a. The horizontal speed of the particles is also different at different contact positions [17][18][19][20][21]. When running with load, the rotor will run at a fixed speed, so there is a speed difference between the stator and the rotor outside the two constant velocity points.…”

Section: The Effect Of Pre-pressure On the Contact Range And Isokinetic Point Of The Stator And Rotormentioning

confidence: 99%

“…When the inclination angle is 75 • , the circumferential driving ability is better, which can reduce the diameter well. Due to the influence of the slip, considering the structure of the motor and the size of the inner diameter of the rotor, the optimal tilt angle is finally determined to be 72.404 • [18].…”

Section: The Effect Of Pre-pressure On the Contact Range And Isokinetic Point Of The Stator And Rotormentioning

confidence: 99%

Analysis of Preload of Three-Stator Ultrasonic Motor

Zhao

Che

et al. 2021

Self Cite

The pre-pressure device of the ultrasonic motor plays a vital role in the design of the entire motor structure, the contact state of the stator and rotor of the motor, dynamic properties of the stator, friction and wear characteristics of the rotor; even the mechanical behaviors of the entire electric machinery have a profound impact. Appropriate pre-pressure is conducive to the smooth operation of the ultrasonic motor, so that the output performance remains excellent, reducing wear and effectively extend the service life of the motor. Therefore, the research on pre-stress is of great significance, as it can better optimize the structure of the three-stator ultrasonic motor and lay the foundation for the stable operation of the motor. First, this paper introduces the construction of the motor as a whole and the pre-pressure device briefly described the working mechanism of the motor, and then introduces the influence of the pre-pressure on the stator and rotor contact models, the position of the constant velocity point, and the modal frequency. Finally, the motor output under different pre-pressures is discussed. The performance experiment has determined the optimal pre-pressure interval, which provides help for its subsequent optimization.

“…To simplify the structure of mechanical systems and improve their dynamic performance and economic efficiency [ 2 ], research on spherical motors has been increased in recent years. Various forms of spherical motors such as permanent magnet type [ 3 , 4 ], induction type [ 5 ], variable reluctance type [ 6 ], and ultrasonic type [ 7 ] have been developed one after another. The complex multi-DOF space motion cannot be controlled without the operating system, and fast and accurate rotor position detection is a prerequisite for accurate motor control.…”

Section: Introductionmentioning

confidence: 99%

Position Detection Method of Piezoelectric Driven Spherical Motor Based on Laser Detection

Zhu

Xie

et al. 2022

Self Cite

Laser detection technology has manypromising applications in the field of motor speed and position measurement. Accurate and fast measurement of position information of spherical rotor is very important for motor control. In this paper, we propose a method for non-contact measurement of the angular velocity of a multi-DOF spherical motor using the Doppler effect of the laser, and further obtain the position information of the motor rotor. The horizontal laser beam from the laser generator is divided into a reference beam I and a measurement beam II through a beam splitter, and the measurement beam II reflects and undergoes Doppler effect after irradiating the rotating motor. The two beams pass through the photoelectric conversion module to obtain the corresponding frequency difference signals to derive the angular velocity and position information of the motor rotor. The correctness of the method is verified experimentally. The results show that the coordinate error of Z and Y axes is less than 2 mm, thatthe error of Z-axes is less than 0.2 mm, and that the method can better measure the spherical rotor position information of the motor.