To assure the long-term stability and reliability of satellite control moment gyroscope (CMG) in orbit, it is essential to effectively test the performance of its high-speed rotor electric drive system. Traditional bench testing scheme suffers from extended test cycles and limited flexibility. To address these issues, brushless DC motor emulator (BLDCME) has emerged as a critical development direction for CMG high-speed rotor electric drive system testing technology, enabling power-level test by substituting the real motor. This paper proposes a design scheme for a CMG high-speed BLDCME based on T-type three-level voltage source converter (VSC). A voltage control strategy based on equal current change rate is adopted to emulate the electrical behaviors of the target brushless DC motor. Furthermore, this paper investigates the impact of system control bandwidth and the matching degree of BLDCME interface filter parameter on system performance, furnishing key insights for the parameter design and optimization of the BLDCME system. Finally, the validity of the proposed design scheme is corroborated via simulation, and the performance of the proposed T-type three-level VSC topology is compared with the two-level VSC topology.