A variable frequency speed regulating
system of a high-frequency vibrating motor is disclosed, relating to construction tool. The motor in present
system is incapable of achieving soft start and is liable to, while cessation, damage a frequency converter and arc in an AC
contactor due to failing to forbid a
branch control cabinet being closed on condition that the frequency converter is in operation, thus bringing potential safety jeopardy while raising the maintenance cost of
system, and the
interlock circuit is so complex as to be disadvantageous to inspection. A
control circuit of the variable frequency
speed control system comprises a detection circuit and a protection circuit, wherein, the detection circuit is provided with a
signal detection end connected with a
signal output end ofthe frequency converter, the detection circuit comprises a
relay, the coil of which is serially connected in the detection circuit as well as a normally
open contact and a normally closed contact of which are arranged in the protection circuit. The variable frequency
speed control system of the high-frequency vibrating motor achieves the purpose of protecting the frequency converter and the AC
contactor, prevents arc phenomenon of the AC
contactor, enhances production safety while prolonging the service life of product, and has simple
interlock circuit, which facilitates the inspection.