GB1502067A - Electric motor overload protection - Google Patents
Electric motor overload protectionInfo
- Publication number
- GB1502067A GB1502067A GB2296676A GB2296676A GB1502067A GB 1502067 A GB1502067 A GB 1502067A GB 2296676 A GB2296676 A GB 2296676A GB 2296676 A GB2296676 A GB 2296676A GB 1502067 A GB1502067 A GB 1502067A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- motor
- point
- stalled
- positive
- 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
Links
Classifications
-
- 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
- H02H7/0833—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 for electric motors with control arrangements
-
- 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
- H02H7/093—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 increase beyond, or decrease below, a predetermined level of rotational speed
Landscapes
- Control Of Direct Current Motors (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Control Of Washing Machine And Dryer (AREA)
- Protection Of Generators And Motors (AREA)
- Electric Vacuum Cleaner (AREA)
Abstract
1502067 Control of DC motors PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 3 June 1976 [6 June 1975] 22966/76 Heading H2J For use with a variable, cyclically switched power supply circuit which includes a rectifying bridge having at least two thyristors 32, 33, a thyristor firing circuit 41, and a high power dissipation resistor 28 connected between the bridge and A.C. mains supply terminals, a permanent-magnet electric motor overload protection circuit 20 comprises means for detecting small residual voltage pulses which appear across the motor terminals 34, 35 and which have a polarity which is opposite to that of the voltage supplied to the motor, said pulses occurring at twice the frequency of the mains supply and each commencing in one half cycle of the supply voltage and ceasing in the next half cycle, the duration of said pulses being longer when the motor is stalled than when it rotates, and means responsive to an output of said detection means, which is provided when the motor is stalled, to provide a control signal for application to the thyristor firing circuit so as to retard the firing of the thyristors until slightly before the end of each half cycle whereby the current in the motor 40 is maintained at a very small value in a stable manner. Figs. 2 and 4 show respectively the voltage appearing across the armature terminals of the motor in a stalled condition and in a rotating condition. In the stalled condition, the duration for which the voltage is slightly positive, i.e. between constants t 3 -t 4 and t 6 -t 7 is considerably longer than the duration for which the voltage is positive, i.e. between t 14 -t 15 and t 18 -t 19 , in the rotating condition. As shown in Fig. 5, the negative terminal 34 of the motor is connected to an information point 78 of the protection circuit 20 and the positive terminal 35 is connected to a line 76 which is used as a reference. The combination of transistors 80, 84 produce, at the collector of 84, a pulse signal in accordance with the voltage which appears at point 78. Point 78 and the collector of 84 are connected to an integrating capacitor 89 via resistors 90 and 87 respectively, and it is arranged that when the motor is running, the voltage at point 88 is negative, but that when the motor is stalled, the voltage at point 88 is positive. A positive voltage at point 88 causes a transistor 94 to conduct and thereby lower the voltage at a point 57 of the thyristor firing circuit to thereby retard firing of the thyristors 32, 33. A warning may be given by a L.E.D. 102.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7517706A FR2313792A1 (en) | 1975-06-06 | 1975-06-06 | PROCESS FOR PROTECTING ELECTRIC MOTORS WITH PERMANENT MAGNETS POWERED BY A CUT-OFF RECTIFIED VOLTAGE AND DEVICES FOR IMPLEMENTING THE PROCESS |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1502067A true GB1502067A (en) | 1978-02-22 |
Family
ID=9156135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2296676A Expired GB1502067A (en) | 1975-06-06 | 1976-06-03 | Electric motor overload protection |
Country Status (7)
Country | Link |
---|---|
JP (1) | JPS5831831B2 (en) |
AR (1) | AR210131A1 (en) |
CA (1) | CA1054669A (en) |
DE (1) | DE2623001A1 (en) |
FR (1) | FR2313792A1 (en) |
GB (1) | GB1502067A (en) |
IT (1) | IT1061983B (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7902129B2 (en) | 2003-10-23 | 2011-03-08 | Buttercup Legacy, Llc | Delivery of agents to the cutting mechanism of paper shredders |
US8109455B2 (en) | 2003-10-23 | 2012-02-07 | Buttercup Legacy, Llc | Delivery of agents to the cutting mechanism of paper shredders |
CN112534702A (en) * | 2018-08-10 | 2021-03-19 | 松下知识产权经营株式会社 | Power conversion device |
CN113550120A (en) * | 2020-04-24 | 2021-10-26 | 青岛海尔滚筒洗衣机有限公司 | Clothes treatment equipment |
CN113550119A (en) * | 2020-04-24 | 2021-10-26 | 青岛海尔滚筒洗衣机有限公司 | Clothes treatment equipment |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57106388A (en) * | 1980-12-22 | 1982-07-02 | Janome Sewing Mach Co Ltd | Controller for safety of commutator motor |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE494823C (en) * | 1930-03-28 | Siemens Schuckertwerke Akt Ges | Safety arrangement for three-phase series collector motors | |
US3621355A (en) * | 1970-03-30 | 1971-11-16 | Gen Electric | Double half wave motor control |
FR2088706A5 (en) * | 1970-04-22 | 1972-01-07 | Sedelem | |
FR2208582A5 (en) * | 1972-11-23 | 1974-06-21 | Radiotechnique Compelec |
-
1975
- 1975-06-06 FR FR7517706A patent/FR2313792A1/en active Granted
-
1976
- 1976-05-22 DE DE19762623001 patent/DE2623001A1/en active Granted
- 1976-06-03 AR AR26349976A patent/AR210131A1/en active
- 1976-06-03 CA CA254009A patent/CA1054669A/en not_active Expired
- 1976-06-03 IT IT4978876A patent/IT1061983B/en active
- 1976-06-03 GB GB2296676A patent/GB1502067A/en not_active Expired
- 1976-06-04 JP JP51064725A patent/JPS5831831B2/en not_active Expired
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7902129B2 (en) | 2003-10-23 | 2011-03-08 | Buttercup Legacy, Llc | Delivery of agents to the cutting mechanism of paper shredders |
US8109455B2 (en) | 2003-10-23 | 2012-02-07 | Buttercup Legacy, Llc | Delivery of agents to the cutting mechanism of paper shredders |
US8544779B2 (en) | 2003-10-23 | 2013-10-01 | Mark S. Allen | Delivery of agents to the cutting mechanism of paper shredders |
US8708261B2 (en) | 2003-10-23 | 2014-04-29 | Buttercup Legacy, Llc | Delivery of agents to the cutting mechanism of paper shredders |
CN112534702A (en) * | 2018-08-10 | 2021-03-19 | 松下知识产权经营株式会社 | Power conversion device |
CN112534702B (en) * | 2018-08-10 | 2024-02-09 | 松下知识产权经营株式会社 | Power conversion device |
CN113550120A (en) * | 2020-04-24 | 2021-10-26 | 青岛海尔滚筒洗衣机有限公司 | Clothes treatment equipment |
CN113550119A (en) * | 2020-04-24 | 2021-10-26 | 青岛海尔滚筒洗衣机有限公司 | Clothes treatment equipment |
CN113550120B (en) * | 2020-04-24 | 2024-05-31 | 青岛海尔洗涤电器有限公司 | Clothes treatment equipment |
Also Published As
Publication number | Publication date |
---|---|
DE2623001C2 (en) | 1988-06-01 |
FR2313792B1 (en) | 1977-12-09 |
CA1054669A (en) | 1979-05-15 |
DE2623001A1 (en) | 1976-12-16 |
IT1061983B (en) | 1983-04-30 |
JPS5831831B2 (en) | 1983-07-08 |
AR210131A1 (en) | 1977-06-30 |
JPS51149516A (en) | 1976-12-22 |
FR2313792A1 (en) | 1976-12-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |