This paper describes the implementation of two
vector control schemes for a variable-speed 131-kW permanent-
magnet synchronous motor drive in super-high-speed
applications. The vector control with a synchronous reference
frame current regulator was implemented with challenging
requirements such as an extremely low stator inductance (28 H),
a high dc-link voltage (600 V), and a high excitation frequency
(1.2 kHz). Because the conventional position sensor is not reliable
at super-high speed, two different schemes were proposed to
measure the position of the rotor. As a first step, a vector control
with three discrete Hall sensors was proposed. Because the
discrete Hall sensors provide rough position information with a
resolution of 30 , a position estimation algorithm was proposed
to derive the precise position. Subsequently, a vector control
scheme without any position sensor was proposed. The proposed
sensorless algorithm was implemented by processing the output
voltage of the proportional plus integral current regulator. Therefore,
the structure is simple and the estimated speed is robust to
the measurement noise. An experimental system was built and
the proposed control was implemented and evaluated with and
without the discrete Hall sensors. The test results, up to a speed of
65 000 r/min, confirmed the validity of the proposed control