INDUCTION MOTOR - FANUC LTD

Title:

INDUCTION MOTOR

Document Type and Number:

WIPO Patent Application WO/1999/000890

Kind Code:

A1

Abstract:

An induction motor which is free from an induced voltage and has high power characteristics over a wide range. The winding of each phase comprises a plurality of partial windings having identical number of turns. When a low speed high torque rotation is necessary, the partial windings of each phase are connected in series in a Y-connection as shown in Fig. 2a, when an intermediate and low speed rotation is necessary, the partial windings of each phase are connected in series in a $g(D)-connection as shown in Fig. 2b. In the case of an intermediate-high rotation, the partial windings are connected in parallel in a Y-connection as shown in Fig. 2c. In the case of a high rotation, the partial windings are connected in parallel in a $g(D)-connection as shown in Fig. 2d. Since all the windings of the phases are used and the numbers of turns of the windings are reduced from the low speed rotation to the high speed rotation in order, an unused winding does not exist, an induced voltage is not generated, the drop of the power at the time of the changeover of the winding pattern can be covered, and high power characteristics can be obtained over a wide range.

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Inventors:

NAKAMURA KOSEI (JP)
MASUYA MICHI (JP)
MAEDA HISASHI (JP)
ICHIKAWA SHINPEI (JP)

Application Number:

PCT/JP1998/002934

Publication Date:

January 07, 1999

Filing Date:

June 30, 1998

Export Citation:

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Assignee:

FANUC LTD (JP)
NAKAMURA KOSEI (JP)
MASUYA MICHI (JP)
MAEDA HISASHI (JP)
ICHIKAWA SHINPEI (JP)

International Classes:

H02P23/00; H02K17/14; H02P23/07; H02P25/10; (IPC1-7): H02P7/36; H02K17/14; H02P7/36

Foreign References:

JPH0646594A	1994-02-18
JPS5989559A	1984-05-23
JPH066961A	1994-01-14
JPS56117563A	1981-09-16

Other References: