QMA group is a large-scaled famous US company which is specialized in researching and developing automation control system. The headquaters located in Delaware of East America. The group holds many branches and production bases around the world.

QMA Electric (Shanghai) Co., Ltd, an exclusively-invested subsidiary company of QMA group, was established in October of 2001, which has become a professional manufacturer of integration of research, production and selling for inverter and frequency conversion control system through nearly 10 years' exploration and development.