According to the "Analysis Report on Production and Marketing Demand Forecast and Transformation and Upgrading of China's Electric Tool Industry", electric tools are mainly divided into metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools. Common electric tools include electric drills, electric grinders, electric wrenches and screwdrivers, electric hammers and impact drills, concrete vibrators, and electric planers. Safety protection Class I tools are equipped with grounding devices, and all or most parts of the insulation structure have basic insulation. If the insulation is damaged, the accessible metal parts are connected to the protective grounding (see grounding) or protective neutral wire installed in the fixed circuit through a grounding device, which will not become a live body and can prevent the operator from getting electric shock. The insulation structure of Class II tools consists of double insulation or reinforced insulation composed of basic insulation and additional insulation. When the basic insulation is damaged, the operator is separated from the charged body by additional insulation to prevent electric shock. Class II tools must use non reconnected power plugs and are not allowed to be grounded. Class III tools are powered by a safe voltage power supply. The effective value of no-load voltage between safety voltage guidance bodies or between any conductor and ground shall not exceed 50V; For three-phase power supplies, the effective value of the no-load voltage between the conductor and the neutral line shall not exceed 29V. The safety voltage is usually supplied by a safety isolation transformer or a converter with independent windings. Protective grounding devices are not allowed to be installed on Class III tools. Radio interference: Single-phase series motors and DC motors with commutators can cause serious electromagnetic interference to televisions and radios. Therefore, when designing electric tools, it is necessary to consider the interference of pitch control on the radio. Measures such as shielding, symmetrical connection of excitation windings, installation of electrical filters, and connection of filters in a delta shape are mainly adopted. If necessary, small inductance coils can also be connected in series at both ends of the motor armature
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