This series of electro-permanent magnetic chuck specialized for small lathe. Particularly suitable for clamping small chuck magnetic workpiece. Adopt modular design, with advantages of strong magnetic force, easy clamping etc. Pre-magnetizing function can facilitate to achieve the initial positioning operation of workpiece. Magnetic permeability depth shallow, also convenient for clamping thickness as low as 6mm thin workpiece. Can completely replace the permanent magnetic chuck. With advantages of low remanence and unit magnetic force strong.