The chemical and pharmaceutical industries are the largest power consumers in today's industrial enterprises, and the degree of dependence on natural resources accounts for more than 60%. The energy problem is a serious challenge. There are two ways to fundamentally solve the energy problem: one is open source, and the other is energy saving . The frequency conversion energy-saving technology of D32 series inverter is a high-efficiency energy-saving new technology with wide application, quick effect and short investment payback period. Common agitators in the chemical and pharmaceutical industries have been widely used.