Base on the current tracing PWM rectifier, a new structure is proposed by introducing a power factor adjuster in to realization power factor variable PWM rectifier unit.
在电流跟踪型pwm整流器的基础上引入功率因数调节器，实现PWM整流器的功率因数闭环控制。
The influence of variable load on a beam pumping unit on the electric current, input power, efficiency and power factor of the electric motor is discussed, and relevant calculating formulae are given.
讨论了游梁抽油机的变动载荷对电动机的电流、输入功率、效率和功率因数的影响，给出了计算公式。
The influence of variable load on a beam pumping unit on the electric current, input power, efficiency and power factor of the electric motor is discussed, and relevant calculating formulae are given.
讨论了游梁抽油机的变动载荷对电动机的电流、输入功率、效率和功率因数的影响，给出了计算公式。
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