What is the difference between ultrasonic motor and traditional motor?

Using the inverse piezoelectric characteristics of piezoelectric materials, the mechanical vibration of the motor stator is excited, and the electrical energy is converted into mechanical energy output through the friction between the stator and the rotor, which drives the rotor to move directionally. Compared with the traditional motor, it has the advantages of small size, high low-speed torque, fast reaction speed, no influence of magnetic field and large holding torque, and has become a research focus of micro-motors at home and abroad in recent years.

Traditional motor

Conventional permanent magnet motors are prone to tooth root saturation, severe cogging torque, large motor positioning torque and difficult to start. Disc motor: From its structure, we can know that the heat dissipation performance of the motor is very good (the traditional motor stator wraps the rotor inside, so the heat dissipation performance is not very good. Moreover, the application of disc motor in automobile hub and wind power generation should have unique advantages, but the power density is low.

differentiate

Compared with electromagnetic motor, ultrasonic motor has two differences. First of all, the ultrasonic motor must work in the ultrasonic frequency domain. According to the different motor structures, the driver is required to output a high-frequency voltage with a frequency of 20~ 100 kHz. Secondly, because the piezoelectric material has the characteristic of capacitive load, which is different from the inductive or resistive load of the traditional motor, in order to improve the efficiency of the driving circuit, realize efficient energy conversion and make the transducer get enough power, a matching circuit must be added between the driving power supply and the transducer.