| 摘要 |
<p>Provided is a high-frequency hardening monitor device (20) comprising a current sensor (21) for detecting the output current of a high-frequency inverter (11), a voltage sensor (22) for detecting the voltage at a heating coil (15) connected in an equivalent circuit manner together with a condenser (12) between the output terminals of the high-frequency inverter (11), and a control unit (23) for performing a hardening administration on the basis of the detected signal of the current sensor (21) and the detected signal of the voltage sensor (22). The control unit (23) calculates the effective value of the output current from the high-frequency inverter (11) on the basis of the detected signal from the current sensor (21), and calculates the effective value of the voltage to establish in a heating coil (15), on the basis of the detected signal from the voltage sensor (22), or calculates a load impedance from the individual effective values, thereby to monitor the hardening.</p> |
