YC series heavy-duty single-phase capacitor start-running asynchronous motors is optimized on the basis of YC series motors. They concentrate the ad vantages of high starting torque of YC seriese and great overload per formance high power factor high efficiency, smooth running and low noise of YL series With their good characteristics such as energy saving low temperature-raising etc. they are widely used in air compressors, grinders, pumps medi cal apparatus, small machine tools as well as other machines which full-load starting is demanded.