GB1014000A - Improvements in control systems for a.c. electric motors - Google Patents

Improvements in control systems for a.c. electric motors

Info

Publication number
GB1014000A
GB1014000A GB4131964A GB4131964A GB1014000A GB 1014000 A GB1014000 A GB 1014000A GB 4131964 A GB4131964 A GB 4131964A GB 4131964 A GB4131964 A GB 4131964A GB 1014000 A GB1014000 A GB 1014000A
Authority
GB
United Kingdom
Prior art keywords
winding
transformer
choke
rectifier
control systems
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
GB4131964A
Inventor
Augustus David John Ractliffe
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.)
Electrical Apparatus Co Ltd
Original Assignee
Electrical Apparatus Co Ltd
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 Electrical Apparatus Co Ltd filed Critical Electrical Apparatus Co Ltd
Priority to GB4131964A priority Critical patent/GB1014000A/en
Publication of GB1014000A publication Critical patent/GB1014000A/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
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
    • H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
    • H02P3/24—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor by applying dc to the motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B66C13/22—Control systems or devices for electric drives
    • B66C13/23—Circuits for controlling the lowering of the load
    • B66C13/26—Circuits for controlling the lowering of the load by ac motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/08—Electrical assemblies or electrical control devices for cranes, winches, capstans or electrical hoists
    • B66C2700/081—Electrical assemblies or electrical control devices for cranes, winches, capstans or electrical hoists with ac motors

Abstract

1,014,000. Control of A.C. motors. ELECTRICAL APPARATUS CO. Ltd. Oct. 9, 1964, No. 41319/64. Heading H2J. An induction motor is braked by supplying a stator winding with direct-current derived from rectifier 27 which is connected through choke-winding 19 across winding 37 of a mains-supplied auto-transformer. The choke has a saturating winding 18 whereby the impedance of coil 19 is reduced, when the rotor current increases, to increase the braking current. This enables the motor to operate at a stable lowering speed irrespective of the magnitude of the load. A discharge resistor 32, having a non-linear volt-ampere characteristic, protects the rectifier 27 against excessive voltage. The transformer may be tapped, and may be replaced by a transformer having separate primary and secondary windings. Specification 794,891 is referred to.
GB4131964A 1964-10-09 1964-10-09 Improvements in control systems for a.c. electric motors Expired GB1014000A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4131964A GB1014000A (en) 1964-10-09 1964-10-09 Improvements in control systems for a.c. electric motors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4131964A GB1014000A (en) 1964-10-09 1964-10-09 Improvements in control systems for a.c. electric motors

Publications (1)

Publication Number Publication Date
GB1014000A true GB1014000A (en) 1965-12-22

Family

ID=10419139

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4131964A Expired GB1014000A (en) 1964-10-09 1964-10-09 Improvements in control systems for a.c. electric motors

Country Status (1)

Country Link
GB (1) GB1014000A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2243730A (en) * 1990-03-21 1991-11-06 Truetzschler & Co An electric motor braking apparatus and method for braking a rotating roller

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2243730A (en) * 1990-03-21 1991-11-06 Truetzschler & Co An electric motor braking apparatus and method for braking a rotating roller
GB2243730B (en) * 1990-03-21 1994-05-11 Truetzschler Gmbh & Co Kg An apparatus and method for braking a rotating roller
US5374885A (en) * 1990-03-21 1994-12-20 Trutzschler Gmbh & Co. Kg Method and apparatus for braking a rotary component in a textile fiber processing machine

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