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。
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