Abstract
1. The use of dynamic braking on high-lift units with excitation of the synchronous motor from an electrical machine exciter considerably reduces the maximum reverse speed (1.5–1.7 times). Thyristor excitation with an AER by deflection of the stator voltage of the motor additionally reduces the reverse speed by 20% in comparison with electrical machine excitation. 2. The factors affecting braking effectiveness are the time of delivering the exciting voltage to the motor's rotor, duration and magnitude of the rotor's current, and magnitude of the Bethel resistors in the stator circuit. 3. Dynamic braking reduces the level of vibration of individual components of the unit by 2.5–4 times in comparison with the regime of stopping the unit in free running down, which substantially increases the operating reliability of the unit.
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