Abstract
This paper presents characteristics analysis results of no-insulation (NI) high-temperature superconducting (HTS) motor with saliency according to motor control schemes. In case of a salient motor, for efficient operation, the commonly-known maximum torque per ampere (MTPA) control method is applied to generate the maximum torque at the given absolute value of stator current by using optimal dq-axes current pair ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$i^{r}_{ds}$</tex-math></inline-formula> , <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$i^{r}_{qs}$</tex-math></inline-formula> ). To figure out whether MTPA control is applicable for NI HTS motor, we applied three control schemes referred from conventional motor control method: (1) MTPA with constant parameters; (2) MTPA with variable parameters; and (3) <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$i^{r}_{ds}=0$</tex-math></inline-formula> control. In addition, we proposed MTPA control with exponential function for suppressing radial leak current. The following key transient profiles of 500 kW NI HTS motor according to motor control schemes are presented: (1) dq-axes current; (2) field coil radial leak current; and (3) torque per ampere value.
Published Version
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