GB360440A - Improvements in and relating to electric motor control - Google Patents

Improvements in and relating to electric motor control

Info

Publication number
GB360440A
GB360440A GB2359530A GB2359530A GB360440A GB 360440 A GB360440 A GB 360440A GB 2359530 A GB2359530 A GB 2359530A GB 2359530 A GB2359530 A GB 2359530A GB 360440 A GB360440 A GB 360440A
Authority
GB
United Kingdom
Prior art keywords
interlock
series
brush
coil
contactor
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
GB2359530A
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.)
ARTHUR FREDERICK HEINRICH
British Thomson Houston Co Ltd
Original Assignee
ARTHUR FREDERICK HEINRICH
British Thomson Houston 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 ARTHUR FREDERICK HEINRICH, British Thomson Houston Co Ltd filed Critical ARTHUR FREDERICK HEINRICH
Priority to GB2359530A priority Critical patent/GB360440A/en
Publication of GB360440A publication Critical patent/GB360440A/en
Expired legal-status Critical Current

Links

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  • Motor Or Generator Current Collectors (AREA)

Abstract

360,440. Control of A.C. motors. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London, and HEINRICH, A. F., 34, Lancaster Road, Rugby. Aug. 6, 1930, No. 23595. [Class 38 (iii).] In the alternating-current motor described in Specification 288,987, [Class 35, Dynamo-electric generators &c.], wherein speed regulation is effected by varying the effective secondary turns, the necessary variation is effected automatically. In the case of a lift motor having secondary winding parts which can be connected in series or in parallel, the change from series to parallel connection is effected at the synchronous brush position, but only when decelerating, the series connection being used at all other times. The Figure shows the circuit and control arrangements for such a motor. The primary winding P is connected to the supply system through one or the other of the reversing switches 1, 2 which carry interlocks 11, 21 in the circuit of a coil 4a operating a switch 4 which connects the elements S1, S2 of the secondary winding in series or parallel. The commutator winding R feeds the secondary winding through two movable brush sets and only one brush B1, B2 of each set is shown. The switch 4 is normally constrained by a spring to occupy the series position shown. A is an interlock on the brush gear of the motor which is closed when the brush gear is in a subsynchronous position and open otherwise, and B is an interlock with the reverse action. 5 is a pilot contactor having an operating coil 5a and a retaining interlock 51, Switches A, B are so positioned that A opens shortly before B closes when the brush gear is moved towards the high-speed position and B opens shortly before A closes when the brush gear is moved towards the low-speed position. Also contacts c, d of the switch 4 are arranged to close before contact e is opened when moving from the series to the parallel connection, and e is closed before c, d are opened when changing from parallel to series. In operation, with the brush gear in the low-speed position and either of the switches 1, 2 closed, interlock 11 or 21 is also closed, but as B is open the energizing coil 5a of contactor 5 is open circuited so that coil 4a is de-energized and the switch 4 remains in the series position. As the brush gear is moved past the synchronous position A opens and B closes so that contactor 5 is closed by the energization of the coil 5a and the interlock 51 also closes. If the brush gear is moved towards the low-speed position, B opens, but the retaining interlock 51 keeps the coil 5a energized so that contactor 5 remains closed. When A closes, coil 4a is energized and the switch 4 moves into the other position to connect the winding S1' S2 in parallel. In the case of a constant horse-power motor, the series connection may be used always for under synchronous running so that the interlock A and contactor 5 can be omitted. In the case of a fan motor, the series connection may be used always for over synchronous running so that the interlock B and contactor 5 can be omitted. Interlock A, B may comprise switches having lever arms carrying rollers which are actuated by cams or ramps on one or both brush rockers. If the switch 4 is to be operated in some position other than the synchronous, there must be no overlap between the closing of contacts c, d and the opening of e to avoid short-circuiting the brushes B1, B2.
GB2359530A 1930-08-06 1930-08-06 Improvements in and relating to electric motor control Expired GB360440A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2359530A GB360440A (en) 1930-08-06 1930-08-06 Improvements in and relating to electric motor control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2359530A GB360440A (en) 1930-08-06 1930-08-06 Improvements in and relating to electric motor control

Publications (1)

Publication Number Publication Date
GB360440A true GB360440A (en) 1931-11-06

Family

ID=10198213

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2359530A Expired GB360440A (en) 1930-08-06 1930-08-06 Improvements in and relating to electric motor control

Country Status (1)

Country Link
GB (1) GB360440A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109683057A (en) * 2017-10-18 2019-04-26 中国电力科学研究院 A kind of online disturbance source locating method and system of subsynchronous oscillation of electrical power system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109683057A (en) * 2017-10-18 2019-04-26 中国电力科学研究院 A kind of online disturbance source locating method and system of subsynchronous oscillation of electrical power system
CN109683057B (en) * 2017-10-18 2021-09-21 中国电力科学研究院 Method and system for positioning subsynchronous oscillation online disturbance source of power system

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