DESC:FORM 2
THE PATENTS ACT 1970
[39 OF 1970]
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See Section 10; rule 13]
"METHOD OF INCREASING MAGNETIC FIELD USING A MULTIPOLE RING MAGNET IN BRUSHLESS PERMANET MAGNET MOTORS"
PORTESCAP INDIA PVT. LTD.
Unit No.2, SDF 1, SEEPZ - SEZ,
Andheri (E), Mumbai - 400096, India
The following specification particularly describes the invention and the manner in which it is to be performed.
,CLAIMS:We Claim:
1. A rotor assembly of a slotless radial flux brushless Permanent Magnet (PM) motor, comprising:
a multi-polar ring magnet (300, 600, 700) positioned around a cannulated shaft (302) of a rotor, wherein a first set of alternate magnetization vectors (304) of the multi-polar ring magnet (300, 600, 700) are normal to an outer diameter (322) of the multi-polar ring magnet (300, 600, 700) and a second set of alternate magnetization vectors (306) are tangential to the outer diameter (322) of the multi-polar ring magnet (300, 600, 700).
2. The rotor assembly of the slotless radial flux brushless PM motor as claimed in claim 1, wherein a number of first set of alternate magnetization vectors (304) and a number of second set of alternate magnetization vectors (306) are equal to number of poles of the multi-polar ring magnet (300, 600, 700).
3. The rotor assembly of the slotless radial flux brushless PM motor as claimed in claim 1, wherein magnetization active length of the multi-polar ring magnet (300, 600, 700) is equal to an arc length (314).
4. The rotor assembly of the slotless radial flux brushless PM motor as claimed in claim 1, wherein the first set of alternate magnetization vectors (304) and the second set of alternate magnetization vectors (306) result in a sinusoidal flux distribution in an airgap.
5. The rotor assembly of the slotless radial flux brushless PM motor as claimed in claim 1, wherein the multi-pole ring magnet (300, 600, 700) creates sinusoidal airgap flux density, and wherein the sinusoidal airgap flux density results in a sinusoidal torque constant.
Dated this 17th day of November 2020
[JAYANTA PAL]
IN/PA 172
Of REMFRY & SAGAR
ATTORNEY FOR THE APPLICANT[S]