| 摘要 |
<p>PURPOSE:To improve a control performance of dynamic braking by controlling an energy consumed by a resistor with a specific resistance value inserted in a DC side. CONSTITUTION:In power running, a line breaker 3 is closed and a three-phase AC power with variable voltage and frequency is supplied from an inverter 10 to an induction motor 11. In this case, a slip frequency fs is added to an output frequency fr of pulse generator 12 to output an inverter frequency finv. In regenerative braking, the slip frequency fs is subtracted from a rotor frequency fr to output the inverter frequency finv. When there is no regenerative load on an electric overhead line side, the line breaker 3 is opened and a line breaker 7 is inputted while rotational energy is consumed by a brake resistance 8. At that time, the inverter 10 is controlled so that a power consumption of the brake resistance 8 is proportional to velocity.</p> |
