| 摘要 |
It is possible to provide an impedance measuring system which can accurately measure an impedance of a fuel cell. A motor rpm detection unit (215) successively detects rpm of a motor (115) controlled by an inverter (110) and outputs the detection result to a superposition signal generation unit (220). The superposition signal generation unit (220) sets the frequency of the impedance measuring signal to a non-resonant frequency so that the control signal of the motor (115) will not resonate with the impedance measuring signal. Thus, by setting the impedance measuring signal to a non-resonant frequency, resonace with the motor (115) is suppressed, which improves the impedance measurement accuracy. |
