EP0547243A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method and apparatus for controlling and driving induction motor
Assignee: Fanuc Corp
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Filing: 1992-07-06
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Granted: —
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Expires: 2012-07-06
Abstract
Abstract A method and apparatus for controlling and driving an induction motor, by which its constant output power can be generated in a wide rotating range. Each of the star-connected windings of the induction motor is divided into two parts, (5t and 3t), at a predetermined ratio of their numbers of turns (e.g. 5:3). At a low speed, only changeover switches MC2 are closed, and through the divided windings (5t and 3t), currents flow. At a medium speed, only changeover switches MC3 are closed, and only through the divided windings (5t), currents flow. At a high speed, only changeover switches MC1 are closed, and only through the divided windings (3t), currents flow. That is, the induction motor is driven, by changing over the number of turns of each winding into one of three stages, so as to make it large at a low speed and make it small as the speed of the motor is increased.
Inventors
- 👤 Kosei Room 11-601 Fanuc Manshion Nakamura
- 👤 Yukio 1915-5 Funatsu Katsuzawa
- 👤 Yasuyuki Fanuc Dai-3 Vira-Karamatsu Nakazawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 01:35
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/16; H02P25/18; H02P2207/00; H02P2207/01
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
152 words
A control apparatus for actuating an induction motor comprising: respective phase windings of Y-connection type each having one end connected to an electric power supply terminal and the other end connected to a neutral point; a first and a second split windings, which are formed by splitting each of said windings at a predetermined split ratio based on the number of turns of winding, the split points of said split windings being respectively connected to a first and a second intermediate terminals; a first changeover switch interposed between said first intermediate terminal of each phase and electric power supply terminal; a second changeover switch interposed between said first and second intermediate terminals of each phase; a third changeover switch interposed between intermediate terminals of said second split windings; and a switching control means for on-off controlling said first, second and third switches in accordance with a rotational speed of said induction motor.
Claim 2
Dependent Claim
254 words
A control method for controlling an induction motor with an actuation control apparatus for the induction motor comprising: phase windings of Y-connection type each having one end connected to an electric power supply terminal and the other end to a neutral point; a first and a second split windings, which are formed by splitting each of said windings at a predetermined split ratio based on the number of turns of winding, the split points of said windings being respectively connected to a first and second intermediate terminals; a first changeover switch interposed between said first intermediate terminal of each phase and said electric power supply terminal; a second changeover switch interposed between said first and second intermediate terminals of each phase; a third changeover switch interposed between said second intermediate terminals of said second split windings; and a switching control means for on-off controlling said first, second and third switches; wherein said controlling method comprising steps of: turning on said second changeover switch and turning off said first and third changeover switches in the case where a rotational speed of the induction motor is in a low speed region; turning on said third changeover switch and turning off said first and second changeover switches in the case where the rotational speed of the induction motor is in a middle speed region; and turning on said first changeover switch and turning off said second and third changeover switches in the case where the rotational speed of this induction motor is in a high speed region.
Claim 3
Dependent Claim
30 words
A control method for actuating an induction motor in accordance with claim 2, in which said second split winding has a larger number of turns than said first split winding.
Claim 4
Dependent Claim
253 words
A control method for controlling an induction motor with an actuation control apparatus for the induction motor comprising: phase windings of Y-connection type each having one end connected to an electric power supply terminal and the other end to a neutral point; a first and a second split windings, which are formed by splitting each of said windings at a predetermined split ratio based on the number of turns of winding, the split points of said windings being respectively connected to a first and second intermediate terminals; a first changeover switch interposed between said first intermediate terminal of each phase and said electric power supply terminal; a second changeover switch interposed between said first and second intermediate terminals of each phase; a third changeover switch interposed between said intermediate terminals of said second split windings; and a switching control means for on-off controlling said first, second and third switches; wherein said controlling method comprising steps of: turning on said second changeover switch and turning off said first and third changeover switches in the case where a rotational speed of this induction motor is in a low speed region; turning on said first changeover switch and turning off said second and third changeover switches in the case where the rotational speed of this induction motor is in a middle speed region; and turning on said third changeover switch and turning off said first and second changeover switches in the case where the rotational speed of this induction motor is in a high speed region.
Claim 5
Dependent Claim
30 words
A control method for actuating an induction motor in accordance with claim 4, in which said first split winding has a larger number of turns than said second split winding.
References Cited (Backward Citations)
No citation records indexed.
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