GB1271431A - Improvements in or relating to electrical tools - Google Patents

Improvements in or relating to electrical tools

Info

Publication number
GB1271431A
GB1271431A GB2151869A GB2151869A GB1271431A GB 1271431 A GB1271431 A GB 1271431A GB 2151869 A GB2151869 A GB 2151869A GB 2151869 A GB2151869 A GB 2151869A GB 1271431 A GB1271431 A GB 1271431A
Authority
GB
United Kingdom
Prior art keywords
speed
motor
april
armature
series
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2151869A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19681763279 external-priority patent/DE1763279C3/en
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB1271431A publication Critical patent/GB1271431A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
    • H02P25/182—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays whereby the speed is regulated by using centrifucal devices, e.g. switch, resistor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/10—Commutator motors, e.g. repulsion motors
    • H02P25/14—Universal motors

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Control Of Eletrric Generators (AREA)
  • Motor And Converter Starters (AREA)

Abstract

1,271,431. Control of A.C. motors. ROBERT BOSCH G.m.b.H. 28 April, 1969 [27 April, 1968], No. 21518/69. Heading H2J. [Also in Division G3] A tool is driven by an A.C. series motor producing full load torque when operating above the normal working speed. The speed may be stabilized by a centrifugal governor, or a tachometer generator associated with a thyristor. Alternatively, a resistor having an inverse voltage-characteristic is connected in series or in parallel with the motor armature. A safety device comprises a switch responsive to the pressure of the cooling air-stream for switching- off the motor when the speed becomes excessive. The centrifugal governor may have an additional pair of contacts acting as a switch-off device, or a vane-type governor may cause rapid braking in the event of excessive speed. In other embodiments, a safety relay responds to changing current distribution between field and armature, or to the voltage developed by a generator.
GB2151869A 1968-04-27 1969-04-28 Improvements in or relating to electrical tools Expired GB1271431A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681763279 DE1763279C3 (en) 1968-04-27 Arrangement for regulating the speed of a universal motor

Publications (1)

Publication Number Publication Date
GB1271431A true GB1271431A (en) 1972-04-19

Family

ID=5697455

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2151869A Expired GB1271431A (en) 1968-04-27 1969-04-28 Improvements in or relating to electrical tools

Country Status (2)

Country Link
FR (1) FR2007143A1 (en)
GB (1) GB1271431A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981002818A1 (en) * 1980-03-24 1981-10-01 Black & Decker Inc Microcomputer controlled power tool

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981002818A1 (en) * 1980-03-24 1981-10-01 Black & Decker Inc Microcomputer controlled power tool
US4317176A (en) * 1980-03-24 1982-02-23 Black & Decker Inc. Microcomputer controlled power tool

Also Published As

Publication number Publication date
FR2007143A1 (en) 1970-01-02
DE1763279A1 (en) 1972-02-17
DE1763279B2 (en) 1976-05-13

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