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为了减少抽油机的能耗，提出了考虑惯性、重力、外载荷时抽油机输入转矩的表达式．根据在输入转矩的一个周期内均方值最小为设计准则，参考了输入转矩为均方值最小时的设计节能型抽油机的方法，给出了应用傅立叶级数法近似平衡输入转矩的计算公式，以指导节能型抽油机的设计
In order to reduce the energy consumption of pumping unit, the expression of input torque of pumping unit considering inertia, gravity and external load is proposed. According to the minimum mean square value of one cycle of input torque as the design criterion and the reference of the design method of energy-saving pumping unit when the input torque is the minimum mean square value, a method of applying Fourier series method to approximate balanced input rotation Moment formula to guide the design of energy-saving pumping unit