Bosch Power Tools 1375-01, 1375AK manual Robust Technology for LONG-TERM HEAVY-DUTY USE, Fan

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ROBUST TECHNOLOGY FOR LONG-TERM HEAVY-DUTY USE.

A real concept:

The operating

High-frequency Tools

frequency determines

 

the performance

Ahigh-frequency motor is a three-phase current motor with a short-circuit rotor. Its stator and rotor consist of a laminated sheet-metal bundle. If the stator winding of the motor is connected to the three-phase current supply, a magnetic field is created (rotary field), which runs through the motor due the arrangement of the winding and which is dependent on number of pole pairs and the frequency.

Fan

How a good idea was consistently further developed: The designation ’high-frequency tools’ came to be known through the market launch of the tools and was given to those powerful high-frequency tools with asynchronous motors, operated with three-phase current at an increased frequency of 200 or 300 Hz. In a physical sense, there is no real connection between these tools and genuine high-frequency technology, but they still came to be known under this name.

In hand tools, rotary current at increased frequency of 200 or

300 Hz combines high electrical performance with minimal motor weight. As the frequency of the rotary current increases, there is a proportional increase in motor speed and thus in the perfor- mance of asynchronic motors. This is limited by the maximum admissible circumference velocity (operating rotational speed) of the tools. An optimum perfor- mance/weight ratio is achieved by high-frequency tools operating at a frequency of 200 to 300 Hz

(Fig. 1). Large differences bet- ween motor rotational speed and operating rotational speed require larger gears. This means that weight savings from the rotary current drive are negated by the increased weight from the stepdown gearing. High-frequency installations using exclusively grinders should be operated at 300 Hz. Using rotary current at increased frequency optimally fulfils the demand for light yet high-performance hand tools.

Stator

Rotor

Housing

Weight (kg)

Total weight

Gear weight

Motor weight

0

100

200

300

400

500

Frequency (Hz)

Fig. 1 The graph shows the dependence of motor and gearing weight on frequency at constant motor performance and rated rotational speed. 300 Hz yields an optimum performance/weight ratio.

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Contents TOP Contents HIGH-FREQUENCY Power Tools Inexpensive Power ApplicationAN Overview with a Single Click ALL Industrial Tools Online DrillsOver N/mm Iron N/mm Selection Guide for DrillsCast180 20 to 15 to 10 to 50 to 30 to 80 to Drill diameter mmDrills Accessories for Drills Dimensional Drawings DrillsRecommended Speeds for HSS Twist Drill Bits 16 mm, B16Grinders Idle rpm With abrasives Selection Guide for GrindersNumber Selection Guide for Grinders Disc and Random Orbit SandersWithwheels ShapedFor grinding points Straight GrindersTo 50 mm in diameter CompleteVoltage 27 to 50 mm in diameterHGS 57/50 Ls HGS 65/3240 to 50 mm in diameter PowerHGS 77/50 HGS 85/40For grinding wheels 50 to 80 mm in diameter Switchtype Remarks ComeswithComplete Speed HGS 77/75For grinding wheels 125 to 180 mm in diameterRemarks Comeswith 100 to 180 mm in diameter Angle GrindersWith 180 to 230 mm in diameterHWS 85/180 HWS 88/180For grinding wheels 230 to 300 mm in diameter HWS 810/230HWS 810/300 Disc sanders and random orbit Disc Sanders and Random Orbit SandersSanders for sanding discs with Mm diameterAccessories for Angle Grinders Dimensional Drawings Straight Grinders Dimensions mm 602 210 602 211 602 245 602 243 Dimensional Drawings Angle Grinders Screwdrivers Dimensional Drawings Disc Sanders Random Orbit SandersTorque accuracy depending Selection Guide for ScrewdriversOn screwdriver system Screwdriving typeWith adjustable cut-out Clutch for screws from CUT-OUT ScrewdriversTo M Impact wrenches for Impact WrenchesScrews from M 6 to M SquareTappers for threads up to 8 mm in diameter TappersHGR 55/10 Current withoutAccessories for SHUT-OFF Screwdriver Special Accessories for ScrewdriversDimensional Drawings CUT-OUT Screwdrivers Dimensional Drawings Angle Wrenches Dimensional Drawings Impact WrenchesAccessories Balancer Loadmin LoadmaxBalancer For loads From 0.3 to 17 kgPlug CONNECTIONS, Leads Stator Rotor Housing Robust Technology for LONG-TERM HEAVY-DUTY USEFan Sample calculation for a Tool installationHigh-frequency electric Network groupsFrequency converter with synchronic generator Designing AN Installation for HIGH-FREQUENCY Electric ToolsParallel operation of frequency converters Compensating for reactive currentElectrical Safety Distribution Network Cable cross-section as a function of voltage and lead length Bosch Service Quality
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