Dwustrefowa regulacja prędkości obrotowej w nowoczesnych napędach elektrycznych opartych na silnikach synchronicznych z magnesami trwałymi

The papers deals with the two-zones speed control of permanent magnet synchronous motors (PMSMs) in modern electric drives dedicated for variable speed applications. The electromechanical characteristic curves of variable speed drives are presented. Two speed control zones can be distinguish in these characteristic curves: the constant torque zone and the constant power zone. The principles of PMSM operation in each speed control zone are described. The constant power zone utilizes the flux weakening technology based on a constant-current-constant-voltage control strategy.