| 摘要 |
FIELD: electricity.SUBSTANCE: opening drive provides for rotation in energised condition and braking with specified speed in energised and de-energised condition. The drive is arranged on the basis of a contactless torque electric motor (CTM) with permanent magnets and a switchboard, providing for closure of motor windings when there is no supply voltage to an electric load (loading resistances, including zero diodes, transistor keys, etc.). The reducer is made with transmission ratio of not more than 3000. The feature of the opening drive is performance of its main braking function with required speed even with no supply in case of emergencies.EFFECT: higher reliability of an opening system, reduced weight and increased functional capabilities.1 dwg |
