FR2440638A1 - OVERLOAD PROTECTION DEVICE FOR A DRIVE MOTOR, PARTICULARLY FOR A DENTISTRY TREATMENT APPARATUS - Google Patents

OVERLOAD PROTECTION DEVICE FOR A DRIVE MOTOR, PARTICULARLY FOR A DENTISTRY TREATMENT APPARATUS

Info

Publication number
FR2440638A1
FR2440638A1 FR7926838A FR7926838A FR2440638A1 FR 2440638 A1 FR2440638 A1 FR 2440638A1 FR 7926838 A FR7926838 A FR 7926838A FR 7926838 A FR7926838 A FR 7926838A FR 2440638 A1 FR2440638 A1 FR 2440638A1
Authority
FR
France
Prior art keywords
circuit
storage element
motor
drive motor
storage
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.)
Granted
Application number
FR7926838A
Other languages
French (fr)
Other versions
FR2440638B1 (en
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.)
Kaltenbach and Voigt GmbH
Original Assignee
Kaltenbach and Voigt 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
Application filed by Kaltenbach and Voigt GmbH filed Critical Kaltenbach and Voigt GmbH
Publication of FR2440638A1 publication Critical patent/FR2440638A1/en
Application granted granted Critical
Publication of FR2440638B1 publication Critical patent/FR2440638B1/fr
Granted legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/0007—Control devices or systems
    • A61C1/0015—Electrical systems
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/02—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools
    • A61C1/06—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools with electric drive
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H6/00—Emergency protective circuit arrangements responsive to undesired changes from normal non-electric working conditions using simulators of the apparatus being protected, e.g. using thermal images
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Veterinary Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Engineering & Computer Science (AREA)
  • Control Of Direct Current Motors (AREA)
  • Protection Of Generators And Motors (AREA)
  • Stopping Of Electric Motors (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

The circuit arrangement contains a measuring circuit (OP1, OP2) having a storage circuit (C1, R3, R4, R8) whose storage element (C1) is in each case charged, when motor overloads occur, by a value which is dependent on the current intensity and duration, and which is discharged again when there are no overload currents. The storage circuit (C1, R3, R4, R8) is dimensioned such that its charging time constant is less than its discharging time constant in order to achieve as good an approximation as possible of the charge state of the storage element to the motor (winding) temperature. The storage element (C1) is connected to a threshold-value monitoring circuit (OP2) which stops the drive motor (M), via a switching element (T) located in the motor supply circuit (L1 - L3) when a specific charge voltage on the storage element (C1) is exceeded.
FR7926838A 1978-11-03 1979-10-30 OVERLOAD PROTECTION DEVICE FOR A DRIVE MOTOR, PARTICULARLY FOR A DENTISTRY TREATMENT APPARATUS Granted FR2440638A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2847765A DE2847765C2 (en) 1978-11-03 1978-11-03 Circuit arrangement for protecting a drive motor from overload, in particular for a dental device

Publications (2)

Publication Number Publication Date
FR2440638A1 true FR2440638A1 (en) 1980-05-30
FR2440638B1 FR2440638B1 (en) 1984-02-24

Family

ID=6053814

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7926838A Granted FR2440638A1 (en) 1978-11-03 1979-10-30 OVERLOAD PROTECTION DEVICE FOR A DRIVE MOTOR, PARTICULARLY FOR A DENTISTRY TREATMENT APPARATUS

Country Status (6)

Country Link
JP (1) JPS5566228A (en)
AT (1) AT381811B (en)
CH (1) CH649178A5 (en)
DE (1) DE2847765C2 (en)
FR (1) FR2440638A1 (en)
IT (1) IT1119562B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0119142A1 (en) * 1983-03-15 1984-09-19 Black & Decker Inc. Electric motor power supply unit for a portable machine allowing protection against the reaction torque

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3042138A1 (en) * 1980-11-03 1982-05-27 Mannesmann AG, 4000 Düsseldorf PROTECTIVE CIRCUIT DEVICE FOR A DC MOTOR, ESPECIALLY FOR A PRINTER REWINDING DC MOTOR
JPS57113726A (en) * 1980-12-29 1982-07-15 Matsushita Electric Ind Co Ltd Overcurrent breaking device for miniature dc motor
DE3128410A1 (en) * 1981-07-17 1983-02-03 Hilti AG, 9494 Schaan EVALUATION CIRCUIT FOR AN ELECTRIC TORQUE SIGNAL ON A DRILLING MACHINE
KR860000144B1 (en) * 1981-11-20 1986-02-27 도시오 미끼야 Drilling machine having an electromagnetic base
DE3519472A1 (en) * 1984-07-03 1986-01-16 Keiper Recaro GmbH & Co, 5630 Remscheid Protection circuit
DE3513179C2 (en) * 1985-04-12 2001-03-15 Papst Licensing Gmbh & Co Kg Protection circuit for collectorless DC motors
DE19705925B4 (en) * 1997-02-17 2005-11-03 Robert Bosch Gmbh Control device for operating a wiper motor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE689100C (en) * 1937-10-23 1940-03-11 Karl Schneider Motor overload protection device
GB1178132A (en) * 1966-03-18 1970-01-21 Biviator Sa Electric Limiter Circuit
FR2277513A7 (en) * 1974-07-01 1976-01-30 Bbc Brown Boveri & Cie PROTECTION DEVICE FOR THE ROTOR OF AN ELECTRIC MACHINE
US3956670A (en) * 1973-01-30 1976-05-11 Westinghouse Electric Corporation Circuit interrupter circuit including improved control
FR2352433A1 (en) * 1976-05-20 1977-12-16 Kaltenbach & Voigt CIRCUIT FOR REGULATING THE ROTATION SPEED OF A DIRECT CURRENT MOTOR, ESPECIALLY FOR DENTISTRY HANDPIECES

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2258174C3 (en) * 1972-11-28 1979-04-05 Hartmann & Braun Ag, 6000 Frankfurt Circuit arrangement for monitoring the heating of current-carrying protégés
JPS50144061A (en) * 1974-05-10 1975-11-19 Meidensha Corporation Motor overload protection system for electric cars
JPS5286134A (en) * 1976-01-14 1977-07-18 Toshiba Corp Overload protector for motor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE689100C (en) * 1937-10-23 1940-03-11 Karl Schneider Motor overload protection device
GB1178132A (en) * 1966-03-18 1970-01-21 Biviator Sa Electric Limiter Circuit
US3956670A (en) * 1973-01-30 1976-05-11 Westinghouse Electric Corporation Circuit interrupter circuit including improved control
FR2277513A7 (en) * 1974-07-01 1976-01-30 Bbc Brown Boveri & Cie PROTECTION DEVICE FOR THE ROTOR OF AN ELECTRIC MACHINE
FR2352433A1 (en) * 1976-05-20 1977-12-16 Kaltenbach & Voigt CIRCUIT FOR REGULATING THE ROTATION SPEED OF A DIRECT CURRENT MOTOR, ESPECIALLY FOR DENTISTRY HANDPIECES

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0119142A1 (en) * 1983-03-15 1984-09-19 Black & Decker Inc. Electric motor power supply unit for a portable machine allowing protection against the reaction torque
FR2542937A1 (en) * 1983-03-15 1984-09-21 Black & Decker Inc DEVICE FOR ELECTRICALLY POWERING THE ENGINE OF AN ELECTRO-PORTAL MACHINE ENSURING THE PROTECTION AGAINST THE REACTION TORQUE PRODUCED THEREBY

Also Published As

Publication number Publication date
IT7969140A0 (en) 1979-11-02
DE2847765C2 (en) 1984-02-16
AT381811B (en) 1986-12-10
ATA649379A (en) 1986-04-15
FR2440638B1 (en) 1984-02-24
JPS5566228A (en) 1980-05-19
DE2847765A1 (en) 1980-05-08
CH649178A5 (en) 1985-04-30
IT1119562B (en) 1986-03-10

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Legal Events

Date Code Title Description
ST Notification of lapse