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本文进行了普通串级调速系统的理论分析並提出了改善功率因数的新观念。提出串级调速系统的速度——转矩特性在不同转速情况下的理论公式。这种系统的最大转矩比电动机的固有最大转矩要小一些,但在调速时保持不变。普通串级调速系统的功率因数很低(大约是0.5至0.6)。为了改善功率因数作者与合作者已经发展了一种建立在强迫换流原理基础上的新系统。它的相量图和计算公式已导出。新系统的功率因数可达0.9以上。已有三台新装置投入工业运转。最大容量245千瓦电机,调速40％。实验结果表述于论文中。每年由于改善功率因数可节电11万度。如与滑差电机相比较,每年可节电44万度。新系统的控制方法和普通串级调速系统一样简便。
In this paper, a theoretical analysis of a common cascade speed control system is made and a new concept of improving the power factor is proposed. The theoretical formula of speed-torque characteristic of cascade speed regulation system under different speed is put forward. The maximum torque of such a system is smaller than the inherent maximum torque of the motor, but remains constant during speed regulation. The common cascade speed control system has a very low power factor (about 0.5 to 0.6). Authors and collaborators to improve power factor have developed a new system based on the principle of forced commutation. Its phasor diagram and formula have been derived. The new system power factor up to 0.9 or more. Three new units have been put into industrial operation. The maximum capacity of 245 kilowatts motor, speed 40%. The experimental results are expressed in the thesis. Each year due to improve the power factor can save 110,000 degrees. As compared with the slip motor, saving 440,000 degrees per year. The new system control method and the ordinary cascade speed control system as simple.