| Abstract |
High speed drive systems can provide a significant contribution to the reduction of sizes of compressors,
blowers and machine tools. A specific problem of these high speed drives is the heating of the rotor,
which can be reduced by replacing the squirrel cage motor (ASM) by a permanent magnet motor (PSM).
As the absolute rotor position is needed for the control of this type of motor, the problem of appropriate
encoders arises, as standard encoders and resolvers are only suitable up to 30000rpm. To overcome this
drawback a sensorless approach is proposed. In a second proposal the standard encoder is replaced by hall
sensors, which can be integrated directly into the motor and do not have any rotating elements, making it
suitable for high speed. In this way, the length of the motor doesn’t need to be increased, while all
advantages of a real position sensor are preserved. |
