FIELD: controlling speed of dual-speed three-phase motors.
SUBSTANCE: proposed device has terminal of one phase in first switching unit directly connected to that of interconnected like phases of two motor windings. Terminals of two other phases of mentioned switching unit are connected to those of transfer contacts of second two-phase switching unit. Terminals of break contacts of second switching unit are connected to those of other phases of motor low-speed winding. Ground-fault pre-detection unit is connected through break contact of first switching unit to phase contact of mentioned switching unit which is directly connected to like phases of motor windings.
EFFECT: enhanced reliability, safety, and simplified design of device.
1 cl, 1 dwg
| Title | Year | Author | Number |
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