FIELD: machine building.
SUBSTANCE: driven tool comprises DC motor, switching circuit, at least one rpm setting unit, ON-duration setting unit, excitation unit, working magnitude identification unit, fault identification unit and threshold magnitude setting unit. Said fault identification unit compares working magnitude revealed by working magnitude identification unit and threshold magnitude set on the basis of working magnitude to define if working state of driven tool is faulted. Threshold magnitude setting unit sets threshold magnitude continuously or in stepwise manner in compliance with rpm set by rpm setting unit.
EFFECT: higher reliability.
10 cl, 5 dwg
| Title | Year | Author | Number |
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