Power conversion device

A power conversion device controlling a magnet motor, comprising:

• a controller configured to:
• calculate a first power based on an output voltage and an output current of the magnet motor,
• calculate a second power based on an electric circuit coefficient, a current command, an output frequency, and an induced voltage coefficient of the magnet motor,
• estimate the induced voltage coefficient so that the first power follows the second power,
• control driving of the magnet motor in accordance with the induced voltage coefficient, wherein
• the controller calculates the induced voltage coefficient so that a deviation between the first active power and the second active power is set to zero or so that a deviation between the first reactive power and the second reactive power is set to zero, on the basis of a relationship between the electric circuit coefficient and a frequency estimation value of the magnet motor,
• perform proportional control and integration control so that the deviation between the first active power and the second active power is set to zero when the magnet motor is in a low speed region, and
• perform the proportional control and the integration control so that a deviation between the first reactive power and the second reactive power is set to zero when the magnet motor is in a medium-high speed region.