The direct-connection style centrifuges use dedicated direct two-speed motor. Comparing with the traditional centrifuges, that canceled the coupling, brake band, triangle band. The motivation would be directly tranformed to the bowl by the two-speed motor, that made the operation steadily, especially adapt to the sterilized and anti-explosive places. The electrical controlling will finish one work cycle automatically. That means Slow moving – High speed starting – Normal operating – Dynamic braking – Electrical braking, will increase the working efficiency actively. And it also can be designed without base installtion, will be easy to use.