| 摘要 |
PURPOSE:To permit control with a high reliability without employing any mechanical torque transmitting means by a method wherein the outer-product operation of a vector is effected based on the vector of magnetic field flux and the vector of armature current to detect the generating torque of a synchro nous motor, compare it with a torque commanding value and detect a difference between both values. CONSTITUTION:A magnetic flux vector operator 17 produces the rotary field flux vectors PHIdF, PHIqF of a static orthogonal coordinate system having (d) axis and (q) axis having an original point at the rotary center of a magnetic field rotor 1F based on a magnetic flux PHIF, set by a magnetic flux setter 16, and a position feedback signal thetaf. A 3-phase/2-phase converter 18 produces armature ampareturn vectors 1HdA and 1HqA set on the coordinates based on the outputs of current detectors 15A, 15B. A multiplier 19 operates PHIdFX1 HqA and another multiplier 20 operates PHIqFX1HdA while both outputs are added in an adder 21 to obtain the instantaneous value T of the generating torque of a motor. An error amplifier 22 amplifies a torque command To from a torque commander 102 and the difference T of a detecting torque T to input them into a controller 100 and control the torque with a high accuracy. |
