FIELD: electricity.
SUBSTANCE: device of smooth AC motor start with initial load, which is considerably lower than the rated value comprises reactors with natural air cooling arranged with the possibility of installation in phase wires, normally open contacts connected in parallel to reactors, and device of contacts control arranged with the possibility of contacts closure after motor current reaches the rated value. Ratio of reactors inductance to their active resistance at room temperature is lower than values of reactors designed for durable operation at the rated current, and which are calculated using found formulas of specified ratio dependence on power of electric motor for situations when ferromagnetic core is available or unavailable in reactors.
EFFECT: reduced dimensions, material intensity and cost.
2 cl, 4 dwg, 3 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF AC MOTOR SOFT START | 2010 |
|
RU2422977C1 |
| MAGNETIC FLUX AMPLIFIER AND POWER DEVICES BUILT AROUND IT | 2000 |
|
RU2201001C2 |
| SMOOTHING REACTOR FOR SOFT STARTING DEVICE OF ELECTRIC MOTOR | 2021 |
|
RU2765872C1 |
| METHOD FOR DETERMINING DYNAMIC INDUCTANCE OF REACTOR AND DEVICE FOR ITS IMPLEMENTATION | 2009 |
|
RU2428703C2 |
| 0 |
|
SU68233A1 | |
| DEVICE FOR PROTECTING THREE-PHASE ELECTRIC MOTOR FROM TWO-PHASE OPERATION | 0 |
|
SU964842A1 |
| SMOOTHING REACTOR FOR MOTOR SMOOTH-STARTER | 2009 |
|
RU2402829C1 |
| THREE-PHASE CURRENT-LIMITING REACTOR FOR MOTOR SMOOTH-STARTER | 2009 |
|
RU2398301C1 |
| DEVICE FOR ADJUSTING REACTIVE CURRENT | 0 |
|
SU1136127A1 |
| DEVICE FOR COMPENSATING FOR VOLTAGE FLUCTUATIONS | 0 |
|
SU866645A1 |
