JPS5579698A - Power supply system for linear motor - Google Patents

Abstract

PURPOSE: To reduce the reactive power and improve the power-factor in a power supply system, by changing the secondary voltage of a power transformer depending on the speed of a moving body.

CONSTITUTION: At time t₁, a signal circuit D₂ generates an output on the basis of a signal from the track of a moving body T. As a result, an AND circuit C₁ generates an output to apply an instruction to two sides of a compact motor A₁. The motor is caused to continue reverse rotation until other time t₂ so that the secondary voltage V₂ of a transformer T₁ constituting an induced voltage regulator is reduced. Because the circuit D₂ generates no output since the time t₂, the motor A₁ is rotated forward by the output voltage V_n of a speed detector SD to raise the voltage V₂ of the transformer T₁. At transfer from a section to another due to the movement of the moving body T, signal circuits D₁∼D₄ produce outputs separately to change the secondary voltages of the transformers T₁, T₂. This results in reducing reactive power and improving the power-factor in ordinary movement and reducing the fluctuation in the reactive power at section transfer.

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