METHOD TO ENSURE DURABILITY OF THREE-PHASE VALVE MOTOR BASED ON SALIENT-POLE SYNCHRONOUS MACHINE Russian patent published in 2011 - IPC H02P6/12 H02P6/16 

FIELD: electricity.

SUBSTANCE: in the method to ensure durability of a three-phase valve motor based on a salient-pole synchronous machine at first the value of the correction angle is determined φ_C for angle characteristic to displace the angle characteristic relative to the torque maximum determined for a three-phase mode of operation, in which maximum of electromagnet torque is provided in a double-phase mode of the salient-pole synchronous machine operation. The value of angle φ_C is previously defined by setting a step-by-step increase of the angle φ_Ci from 0 with a pitch of where n - quantity of steps at the half-period of angle characteristic, according electromagnetic torques of the valve motor are measured as M₀, …, M_i, M_i+1 where i=1, 2, … n, subsequent M_i+1 and previous M_j values of the electromagnetic torques are compared. If the condition of M_i+1<M_i is met, the angle of correction is defined as the angle of correction φ_Ci corresponding to the value of the maximum torque M_j. The at each interval of width-pulse modulation the working condition is determined for every of three phases in the frequency converter and the motor in the form of bits by failures of phases a, b, c, as well as the value of the bit calculated using a logical expression d-a∪b∪c, where ∪ - logical operation OR, and in case a failure is detected on one of the phases, in the system of valve motor control settings for phase currents are modified so that the phase shift in two remaining phases acquired the value of r/3 radian in the double-phase emergency mode with observation of equality of magnetomotive forces in the remaining phases of the motor and variation of the load angle θ, determined between the voltage vector in the phase and an inverse vector of electromotive force, at the value θ=r/2 in the three-phase mode by the load angle Ψ_A, determined between the current vector in the phase and the inverse vector of electromotive force of the phase, at the value of Ψ_A=r/6 in the double-phase mode, the amplitude is set for shaped phase currents Iω; the value of current σ-digit binary code is detected for a sensor of position of the rotor α, and settings for phase currents in case of failure detection in one of the phases are generated using expressions for leading and lagging phases of the current vector by formulas specified in the application material.

EFFECT: provision of durability of a three-phase valve motor on the basis of a salient-pole synchronous machine.

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