Electric screwdriver security measures
PostDate：2013-12-10Click：1150
① class Ⅰ security tools : tools with a grounding device, all or most of the insulation structure parts have basic insulation. If the insulation is damaged, due to the accessible metal parts by grounding and protection grounding installed in fixed lines ( see the ground ) or to protect access to zero wires are connected together and not become a charged body to prevent shock the operator . ② Ⅱ Tools Safety: double insulation insulation structure of such tools by basic insulation and supplementary insulation or reinforced insulation components. When the basic insulation damage , the operator charged by the additional insulation and body separated , not to shock . Class Ⅱ tool must not be re- connected to the power plug , do not allow the ground . ③ Ⅲ class security tools : These tools consist of safe voltage power supply. Guiding body safe voltage between a conductor and earth or any RMS load voltage does not exceed 50V; three-phase power to the load voltage , rms between the conductor and the middle does not exceed 29V. Security voltage is typically supplied by a safety isolating transformer or converter has separate windings. Tools are not allowed to set the class Ⅲ protective grounding device . ④ radio interference suppression : single-phase series motor and DC motor with a commutator cause TV , radio hereby severe electrical interference , so the electric screwdriver to be considered in the design of radio interference Yang system . The main use of shielded Reed hereby symmetrical windings connection, set the electrical filters, filter connected into △ shape other measures. If necessary, also at both ends of the motor armature series of small inductors .
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Electric screwdriver as mechanical parts, work is inseparable from the electric power granted , electric power granted to provide energy and related control functions for the electric screwdriver. Driven by the rotation of the motor. Since the parameters are not the same motor electric screwdriver , electric power granted in the case of the same power output , speed will be different.
