Drive controller for ac motor

摘要: PROBLEM TO BE SOLVED: To drive an efficient AC motor by switching of control, without using a map which requires many experiments. SOLUTION: This controller uses PWM(pulse-width modulation) current control mode and rectangular wave voltage phase selectively means switch 28. At this time, when it operates in the mode, switches over to PWM absolute value |ϕi| actual supplied 38 falls under |θ0| prescribed phase. The θ0 is provided with phase, where for example, torque/current ratio becomes maximum. Conversely, operation amplitude |V| from 14 circuit 30 exceeds V0. For V0, limiting at which, set can be performed stably.