Rotary piston pumps always used as backing pumps of vacuum systems in vacuum induction ovens.
真空感应炉真空机组中的前级泵，历来使用滑阀泵。
A high feature and low cost drive system can be composed of this kind of drive combining a internal-feedback wound-rotor induction motor for loads like fans and pumps.
装置结合内馈绕线式电动机构成风机、水泵类负载的调速系统，具有极高的性价比。
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