Controller of permanent magnet synchronous motor

摘要: A controller of a permanent magnet synchronous motor in which terminal voltage the can be controlled with high accuracy even for variation constant through simple arrangement without requiring square root or complex calculation expressions. Terminal is by feeding negative current to d-axis such that maximum output an inverter does not exceed motor. Magnitude component regulated comparing command value being inputted upper limit (threshold value) set based on inverter, switching negatively increasing direction when exceeds limit, and decreasing voltage. The thereof inverter.