Bosch High-frequency production tools professional blue Page 43
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A real concept: high-frequency tools The operating frequency determines the power How a good idea was consistently further devel- Three-phase current with an increased frequency of oped: The designation “high-frequency tools” came 200 or 300 Hz allows for hand tools with high to be known through the market launch of the tools electrical powers at low motor weight. As the and was given to those powerful high-frequency frequency of the three-phase current increases, the tools with asynchronous motors, operated with motor speed and therefore the power of the three-phase current at an increased frequency of asynchronous motors increase at the same ratio. 200 or 300 Hz. In a physical sense, there is no real This is limited by the maximum permitted circum- connection between these tools and genuine ferential speed (working speed) of the tools. high-frequency technology, but they still came to be High-frequency tools operated at a frequency of known under this name. 200 to 300 Hz have an optimum power-to-weight STRAIGHT GRINDERS Guide | High-frequency technology | 43 ratio (Fig. 1). Larger gears are necessary if there are greater differences between motor and working three-phase drive is cancelled out by the greater weight of the transmission gear unit. High-frequency systems equipped only with grinders should be operated with 300 Hz. Applying three-phase current with increased frequency perfectly meets the demand for lightweight but powerful hand ACCESSORIES tools. ANGLE GRINDERS speed. As a result, the weight saving on the Weight (kg) Total weight Weight of the Fig. 1 The dependence of the motor and gear weight on the frequency at constant motor power and rated speed: The ratio of power to weight is optimal at 300 Hz. Weight of the motor 0 100 200 300 400 500 Frequency (Hz) HIGH-FREquENCy TECHNOLOGy gearbox
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