Voice coil motor from a different perspective of the principle, first of all, we look at the voice coil motor, which is a special form of direct drive motor. Has a simple structure, small size, high speed, high acceleration, fast response and other characteristics. In recent years, along with the improvement of performance requirements of high-speed and high-precision positioning systems and the rapid development of voice coil motor technology, voice coil motors are widely used not only in precision positioning systems such as magnetic disks and compact disc positioning, but also in many different forms of high acceleration , High-frequency excitation has also been widely used. Such as: optical system lens positioning, multi-coordinate positioning platform for mechanical tools, medical devices, precision tubes, vacuum tube control.

1. Magnetics principle: The working principle of the voice coil motor is based on the ampere principle, that is, the conducting conductor placed in the magnetic field, it will produce force F, the size of the force depends on the magnetic field strength B, the current I, and the magnetic field and current direction.

2. Electronics Principle: Voice coil motor is a single-phase bipolar device. Applying a voltage to the coil generates a current in the coil, which in turn generates a force proportional to the current in the coil, causing the coil to move axially in the air gap, which determines the direction of motion of the coil by the direction of the current. When the coil moves in a magnetic field, it generates a voltage (ie, induced electromotive force) in the coil that is proportional to the speed of the coil, the strength of the magnetic field, and the length of the conductor. Drive voice coil motor power supply must provide enough current to meet the needs of the output force, and to overcome the coil in the maximum speed of motion induced electromotive force generated, as well as through the coil leakage inductance pressure drop.

3. Mechanical system principle: voice coil motor often as a magnet and coil components for sale. The minimum air gap between the coil and the magnet is usually (.254 to 0.381) mm. This air gap can be increased as required, but only to determine the range of motion that the guidance system will allow while avoiding friction or collision between the coil and the magnet . In most cases, the moving load is connected to the coil, that is, the moving coil structure. The advantage is that the fixed magnet system can be relatively large, so that a strong magnetic field can be obtained. The disadvantage is that the voice coil power transmission line is in a moving state and is prone to open circuit. At the same time due to the movable support, the thermal contact between the moving parts and the environment is very bad. The heat generated by the moving voice coil will increase the temperature of the moving parts, so the maximum allowable current in the voice coil is smaller. When the load is particularly sensitive to heat When the load can be connected with the magnet, that is fixed voice coil structure. The cooling of the structure coil is no longer a big issue, and the maximum current allowed by the coil is large, but in order to reduce the mass of the moving part, a smaller magnet is used and therefore the magnetic field is weaker. Linear voice coil motor can be driven directly, and from rotation to rectilinear motion without recoil, there is no energy loss. The preferred guide is a linear bearing or bushing in combination with a hardened steel shaft that integrates the shaft / bushing as an integral part. It is important to keep the guide system low-friction so as not to degrade the smooth response of the motor.

        A typical rotary voice coil motor uses a shaft / ball bearing as the guidance system, which is the same as a conventional motor. Rotary Voice Coil Motors provide a very smooth motion that makes them the first choice in applications that require fast response, limited angle excitation. Such as universal joint assembly. If you are interested in our voice coil motor, please contact us: 400-007-7724