| 摘要 |
Object of the present disclosure is to improve accuracy of over-temperature protection of an electric motor (1). A control device (7) controls an inverter main circuit (2) for driving the electric motor (1). An electric power conversion circuit controller (4) acquires DC voltage input to the inverter main circuit (2), output voltage of the inverter main circuit (2), motor amperage of current flowing through the electric motor (1), and motor frequencies indicating rotation rate of the electric motor (1). Based on at least one of the DC voltage, output voltage, motor amperage and motor frequencies, a motor loss estimator (5) calculates a stator loss and rotor loss, each including fundamental and harmonic losses of the electric motor (1). Based on the inverter output voltage, stator loss and rotor loss, the electric power conversion circuit controller (4) outputs an actual control value for control of the inverter main circuit (2). |
