BLUSHLESS DC MOTOR AND BLUSHLESS DC MOTOR CONTROLLER

Title:

BLUSHLESS DC MOTOR AND BLUSHLESS DC MOTOR CONTROLLER

Document Type and Number:

WIPO Patent Application WO/2004/049541

Kind Code:

A1

Abstract:

Let (Ѳ₀) be the angle formed between the end on the magnetic pole center side of a magnetic flux barrier (22) and the end of an adjacent magnetic flux barrier (22) on the side contacting a rib 23 with respect to the rotor center, f be the oscillation frequency desired to be reduced, Pn be the number of pole pairs, f₀ = Pn * N be the electric angle frequency, N be the motor rpm, m = 1, 3, 5,..., and Ѳ_r be the angle formed by ribs with respect to the rotor center. The angle is set such that the relation Ѳ₀ = 180°* m / (Pn * f / f₀), (where, 2 Ѳ₀ - Ѳ_r < 90°) is satisfied, whereby high efficiency and low noise can be easily made compatible.

Inventors:

NISHIJIMA KIYOTAKA (JP)

Application Number:

PCT/JP2003/015203

Publication Date:

June 10, 2004

Filing Date:

November 28, 2003

Export Citation:

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Assignee:

DAIKIN IND LTD (JP)
NISHIJIMA KIYOTAKA (JP)

International Classes:

H02K1/27; H02K21/14; H02K29/03; H02K29/00; (IPC1-7): H02K1/27; H02P6/18; H02K29/06

Foreign References:

US6008559A	1999-12-28
JP2001231196A	2001-08-24
US6218753B1	2001-04-17
JP2001268873A	2001-09-28
EP1289101A2	2003-03-05

Other References: