Bosch High-frequency production tools professional blue Page 44
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44 | High-frequency technology | Guide High-frequency technology A guide for the user Durable and reliable three-phase motors ▶ Constant speed under load The drop in speed of Bosch high-frequency tools is A magnetic field forms in a three-phase current motor, only 3–5% at rated load (Fig. 2). This guarantees which circulates through the motor. This is called a that the recommended cutting speeds can be fully rotary field and is dependent on the number of pole exploited during grinding. The constant cutting pairs and frequency. When the smallest possible num- speed allows you to use bits more efficiently and, at ber of pole pairs is used, at a frequency of 50 Hz, for the same time, to extend their lifetime. example, this results in a rotary field or rotor speed of 3,000 rpm; at a frequency of 200 Hz: 12,000 rpm and at 300 Hz: 18,000 rpm. ▶ Low maintenance costs at high load capacity Bosch high-frequency tools have a service-friendly design with a motor free of wearing parts. Even Due to its low bearing clearance and the fixed stator under the highest loads (e.g. in foundries), they are winding, the motor is mechanically and electrically acknowledged as having a long lifetime and incur very reliable in operation and excels due to its smooth, only low maintenance costs. low-vibration running. The drop in speed at rated load is only 3–5%, and the peak power is approximately ▶ High degree of efficiency 2½ times the rated power. Brief overloads are pos- The high degree of efficiency of Bosch high-frequen- sible if they do not lead to the permitted winding cy tools allows for their cost-effective and environ- temperature being exceeded. mentally friendly use in continuous operation. Since hand tools are supposed to be as lightweight and powerful as possible, Bosch has opted for “dust protection with direct cooling” in its high-frequency motors. This approach combines the advantages of enclosed and open designs. The flow of cool air ensures good heat dissipation, while dust and dirt are ing system. The design of Bosch high-frequency tools offers the following advantages in the application: Power output [W] simultaneously prevented from infiltrating the circulatPeak power Power output ▶ Optimum power at low weight In continuous operation, Bosch high-frequency tools achieve power of up to 400 watts per kilogram of machine weight. The peak powers can briefly deliver up to 2½ times the continuous Speed power. These high reserves allow for a decisive improvement to performance. Rated power Power input [W] Fig. 2 Power and speed progression in relation to load torque Speed [rpm]
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