A rotary drive is a hybrid driving mechanism. The permanent magnet is bonded to the free end of the magnetic bracket, and the drive arm and the magnetic support with a permanent magnet are formed by a half sleeve one and a half sleeve, which is fixedly connected by a bolt to form a sleeve. Another drive arm and a magnetic bracket are installed in the symmetrical position of the sleeve, Rotary Actuators the sleeve and the connecting shaft are connected by bolts, the other end of the connecting shaft is in surplus with the inner ring of the bearing, and the outer ring of the bearing is matched with the base interference. The advantage is: using the easy to obtain the symmetrical excitation to drive, the output speed is larger, the movement is stable, the driving element uses the chip type piezoelectric oscillator, Rotary Actuators the price is low, the structure connection is convenient.
Rotary actuator is a kind of miniature precision drive device, which has the advantages of high positioning precision, fast response, compact structure and high output power of unit weight, and is widely used in optical fiber docking, biomedical, precision manufacturing, medical operation and other fields. Rotary Actuators The inertial piezoelectric actuator has the advantages of simple structure and unique driving mode, but its driving signal often uses asymmetric sawtooth wave and the circuit is complicated.
The rotary drive is driven by a symmetric signal. This kind of magneto-piezoelectric rotary actuator has not been studied at home and abroad, and the research of this paper provides a new idea for the development of piezoelectric actuators. The main research contents of this paper are as follows: 1. Current situation and application of piezoelectric actuators the paper analyzes the current situation and application field of piezoelectric actuators, Rotary Actuators and studies its basic driving characteristics for the representative direct motion, stepping and inertial piezoelectric actuators. Combined with the characteristics of the inertial piezoelectric actuator, Rotary Actuators a magnetic-piezoelectric rotary actuator is proposed, which uses a symmetric signal drive which is easy to obtain, simplifies the power generation circuit, and realizes the drive-oriented motion by using the clamping structure as the driving part. 2. Piezoelectric drive basic theory and magnetic materials research magneto-piezoelectric action the main driving part of the rotary actuator is the piezoelectric oscillator under magnetic action, combined with the inverse piezoelectric effect and the magnetic action, the coupling effect of magnetic and piezoelectric can change the motion performance of the actuator. According to the theoretical knowledge of piezoelectric actuator the piezoelectric vibrator of this paper chooses PZT piezoelectric ceramics with Le vibration mode as driving element, and adopts cantilever mode to clamp. Rotary Actuators The magnetic properties of ND-FE-B permanent magnets and no. 45th steel mass block were chosen to generate magnetic force and the magnetic forces between them were deduced. 3. magneto-Piezoelectric rotating drive arm research and analysis of the principle that the drive arm with the clamping difference can produce motion output under symmetric excitation, using different simulation software to simulate the driving arm, and provide the basis for the structure design and test analysis of the driving arm, the effect of the distance of the patch and the length of the effective substrate on the free free end displacement and the first-order natural frequency are obtained by using ANSYS to simulate the structure parameters of the drive arm. Rotary Actuators By Simulink the motion characteristic of the driving arm under sinusoidal and square wave excitation, the displacement response and the inertia force change law are obtained, the magnetic force of the mass block and the permanent magnet is equivalent to the nonlinear spring force, and the motion law of the driving arm under the magnetic action is obtained by using ANSYS. The proper clamping difference is obtained for the static dynamic test of the driving arm with different clamping difference, and the response of the driving arm to the sinusoidal and square wave excitation is tested. The effect of excitation signal voltage, frequency and magnetic distance on the amplitude difference is obtained by measuring the motion performance of the single and double side magnetic acting arm respectively. 4. Magnetic-Piezoelectric rotary actuator motion principle and prototype design the motion principle of single side and two side magnetic actuator under square wave excitation is analyzed, Rotary Actuators and the formation of actuator rotation motion is analyzed from the change of inertia force produced by reciprocating vibration of the driving arm. The core components of different clamping sleeve and magnetic support actuator are designed, the principle of selecting the main structure quality is analyzed, the suitable base bearing is selected, and the prototype of single side and double side Magneto piezoelectric rotary actuator is fabricated. 5. Magneto-Piezoelectric rotary actuator Experimental research the whole motion performance test system is constructed for three kinds of piezoelectric rotary actuators, such as non-magnetic, single side magnetism and double side magnetic action, and the motion performance of three kinds of actuators under sinusoidal and square wave excitation is tested. The main performance parameters are rotational speed and mean step distance, the influence factors are the voltage, frequency and type of driving signal, and according to the test results, the effect of these factors on the motion performance is analyzed, Rotary Actuators and the peak speed of three kinds of piezoelectric actuators in their operating frequency bands is obtained. The variation law of the speed and average step distance of the three piezoelectric actuators is analyzed, and the variation of the speed and average step distance of the three types of piezoelectric actuators with the voltage. The test results of the magnetic-piezoelectric actuator speed rise are analyzed from two angles of starting current and work.