有效功率与输入功率之比称为通风机效率
介绍了气隙转矩法的工作原理，给出了通风机效率现场测试系统的硬件组成，并阐述了效率测试过程。
Has introduced the principle of the air-gap torque method, give the hardware of the ventilator efficiency testing system and illustrated the efficiency testing process.
本文分析了目前纺织厂通风机可控硅串级调速四种主电路方案的特点、效率和谐波等情况。
This paper analyses the characteristics, efficiency and harmonic of four kinds of power circuits for SCR-cascade control used in textile mill ventilators.
为了提高轴流通风机的效率和降低噪音，用复合形法对轴流通风机的气动设计进行优化。
To improve the efficiency and reduce the noise of the axial fan, Optimization is made for the pneumatically designing through Composite shape arithmetic.
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