Maximum Torque Per Ampere Control Scheme Considering NI HTS Field Coil Behavior for Synchronous Motor With Salient Rotor Core

This is the authors' abstract. We don't add key points for this paper.

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 (iʳds,iʳqs). 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)iʳds=0control. 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.