DICI In order to provide a theoretical basis for the selection of voice coil motor, the technical working principle and structural form of voice coil motor are described in detail. As a new direct drive motor with special structural form, voice coil motor has high acceleration, high speed, fast response, smooth force characteristics and other excellent performances. On this basis, the selection and calculation methods of linear voice coil motor and rotary voice coil motor are given respectively, and the application occasions of voice coil motor are introduced in detail, which provides a theoretical basis for the specific application of voice coil motor.
Voice Coil Motor is a special type of direct drive motor. It has the characteristics of simple structure, small volume, high speed, high acceleration response, etc. Its working principle is that the energized coil (conductor) will generate force when placed in the magnetic field, and the force is proportional to the current applied on the coil. The motion form of voice coil motor manufactured based on this principle can be straight line or arc.
In recent years, with the improvement of the performance requirements for high-speed and high-precision positioning systems and the rapid development of voice coil motor technology, voice coil motor is not only widely used in precision positioning systems such as disk and CD positioning, but also widely used in many different forms of high acceleration and high-frequency excitation. For example, the positioning of the lens in the optical system; Multi coordinate positioning platform for mechanical tools; Precision electronic tube and vacuum tube control in medical devices; In flexible robots, voice coil motors can also be used to effectively suppress vibration in order to make the end effectors locate quickly and accurately, but the detailed technical principles of voice coil motors are rare.
Principles of Electronics
Voice coil motor is a single-phase bipolar device When voltage is applied to the coil, current is generated in the coil, and then a force proportional to the current is generated on the coil to make the coil move axially in the air gap. The direction of motion is determined by the current direction of the coil When the coil moves in the magnetic field, a voltage (i.e. induced electromotive force) will be generated in the coil which is proportional to the speed of coil movement, magnetic field strength, and wire length The power supply for driving voice coil motor must provide enough current to meet the demand of output force, and overcome the induced electromotive force generated by the coil at the maximum speed of movement and the leakage voltage drop through the coil
The voice coil motor based on the principle of ampere force is a simple electromagnetic device without directional conversion. It has high reliability and energy conversion efficiency is increasingly used in various linear and rotary motion systems With the characteristics of fast, smooth, no cogging, no lag response, the voice coil motor can be well applied to the servo control requiring high speed, high acceleration, linear force or torque response
