Afterwards, a prototype is fabricated using the optimised parameters, and its performance is tested experimentally. Comparing the experimental and simulated load torque/rotational speed relation for the regulator, the validity of the dynamic model is proven. Finally, conclusions and future research prospects are detailed in Section 5.2.?Overall Structure and Actuation Principle of the Piezoelectric Dynamic Balance RegulatorFigure 1 shows the structure of the piezoelectric dynamic balance regulator, which can be mounted on the end of the rotor of a motorised spindle system using an interference fit or a keyway to rotate with the rotor. Except for the counterweight block, all of the components of the regulator are axially symmetric to obtain an intrinsically balanced design.
Figure 1.
Cross-sectional view of the in situ piezoelectric dynamic balance regulator.There are two piezoelectric actuating devices installed in the regulator housing. Each device consists of a rotor and a piezoelectric stator with six driving teeth. The stator is fixed on the mounting surface of the regulator. The driving teeth on the stator press against the inner circumference of the rotor, which rotates in a groove on the mounting surface (Figure 2).Figure 2.Contact friction drive scheme of the stator and the rotor.The stator and the rotor are pre-tensioned in the radial direction to avoid an increase in the motor thickness during operations.
Additionally, a counterweight block is installed on each rotor and rotates with the rotor.
When the piezoelectric stator resonates in an in-plane bending vibration mode under high-frequency sinusoidal voltage excitation, the stator will act as a friction drive to move the rotor structure to the desired position to Batimastat alter the balancing vector. Cilengitide The combined action of the two piezoelectric actuating devices creates a resultant balancing vector that achieves dynamic balance adjustment by controlling the positions of the two counterweight blocks. The dynamic balancing principle is shown in Figure 3.Figure 3.Principle of dynamic balancing.The piezoelectric stator consists of an annular elastic metal body with two annular piezoceramic discs bonded to the top and bottom. Six driving teeth are distributed equally around the outer circumference of the metal body. Each bi-directionally polarised piezoceramic disc has six uniformly polarised regions, as shown in Figure 4(a). In this figure, the black arrows represent the direction of the polarisation of each region.