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The difference between an electronic tension device and a magnetic tension device

Electronic type tension device
Features: the core tension generating components using magnetic hysteresis brake or a slightly worse performance of magnetic particle brake, through low voltage current regulation, tension stability, LED display. (hysteresis brake is composed of two parts: rotor and stator poles. The rotor is made of special magnetic hysteresis material, there is a certain gap between the stator poles, the rotor rotates in the gap. When the coil is energized, a magnetic field is generated in the gap, so that the rotor has a hysteresis effect. When the hysteresis rotor in the external force to overcome the hysteresis force rotation, resulting in the rated torque. Only the size of the torque and excitation current, and speed independent implementation of non contact torque transmission).        
Magnetic tension device
Features: magnetic tension control is produced through the magnetic damping torque, no mechanical friction, so they can have long-term and stable tension, and the precision can be effectively guaranteed, suitable for the general accuracy of the use of the product, which belongs to the low price, is the economic type tension device. Working principle: the use of non-contact magnetic torque with torque. Advantages: MTA can provide two section tension, winding when the foot to meet. Shortcomings: due to the limitation of tension control in winding structure, setting tension only from tension to tension, if the tension into small tension, it must be cut after cut in small winding state to the desired tension in the parking state.      
Overall, the magnetic tension device is not as good as the electronic tension device, but if the winding accuracy is not high, the preferred magnetic tension device.