Abstract
In the article, the structural scheme of the synchronous motor torque control channel is shown and mathematically described. Passing of a sine signal in the torque control loop is considered, equations for describing the dynamic properties of the current control loop are given. Specific features relating to the frequency characteristics of the channel for controlling of the electromagnetic torque in the adjustable variable speed drive with synchronous electric machines are considered. The control channel is regarded as a linear system with amplitude modulation. A comparative analysis of the experimental and calculated Bode plots of the current and torque control loops is carried out.
Highlights
AC variable speed drives are operated by close loop scheme with the inner loop of the indirect control of the electromagnetic torque and outer loop – speed
Theoretical The control loop of the torque (CLT) in the variable-frequency synchronous electric drive should be carried to multivariate the same systems of regulation with the amplitude modulation of the Uin input signal
The electromagnetic torque of the motor Mi resulting from this interaction is considered as an outcome of the current (i) secondary multiplication by the sinusoidal value of the same frequency, as to PCGB, but with the γ – degree phase shift: Mi = LmIri sin (ω1t + γ), where Lm – the maximum value of the mutual induction coefficient between the rotor winding and one of the stator phases; Ir – rotor current of the synchronous motor; γ – the angle of shift between the sinusoidal quantity given on inputs of PCG Band SM [5]
Summary
AC variable speed drives are operated by close loop scheme with the inner loop of the indirect control of the electromagnetic torque and outer loop – speed. The electromagnetic torque of the motor Mi resulting from this interaction is considered as an outcome of the current (i) secondary multiplication (demodulation) by the sinusoidal value of the same frequency, as to PCGB, but with the γ – degree phase shift: Mi = LmIri sin (ω1t + γ) , where Lm – the maximum value of the mutual induction coefficient between the rotor winding and one of the stator phases; Ir – rotor current of the synchronous motor; γ – the angle of shift between the sinusoidal quantity given on inputs of PCG Band SM [5]. Practical For application to the analysis of processes in the variable-frequency AC electric drive of the standard device of the Bode plot and transfer functions will consider passing of a sine signal through links of one phase of the control loop of the torque [6].
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