WATER PUMP MOTOR, AND WATER PUMP USING SAME

• US 20120183421A1
• Filed: 02/13/2012
• Published: 07/19/2012
• Est. Priority Date: 08/17/2009
• Status: Active Grant

• Current Assignee: Amotech Co., Ltd.
• Original Assignee: Amotech Co., Ltd.
• Inventors: KIM, Byoung Soo
• Granted Patent: US 9,318,931 B2
• Time in Patent Office: Days
• US Class Current: 417/423.7
• CPC Class Codes: D06F 2103/48 of the motor driving the pump
• CPC Class Codes: D06F 39/085 Arrangements or adaptations of pumps
• CPC Class Codes: F04D 13/06 the pump being electrically driven
• CPC Class Codes: F04D 13/0606 Canned motor pumps
• CPC Class Codes: F04D 13/0626 Details of the can
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02K 2211/03 Machines characterised by circuit boards, e.g. pcb
• CPC Class Codes: H02K 5/10 with arrangements for protection from ingress, e.g. water or fingers
• CPC Class Codes: H02K 5/128 using air-gap sleeves or air-gap discs
• CPC Class Codes: H02K 5/1672 radially supporting the rotary shaft at both ends of the rotor H02K5/1677 takes precedence
• CPC Class Codes: H02K 7/14 Structural association with mechanical loads, e.g. with hand-held machine tools or fans with fan or impeller for cooling the machine H02K9/06

Abstract

“Provided is a water pump motor that implements a waterproof structure of a motor using a cover to seal a stator, and a water pump using the same. The water pump motor includes: a lower case on top of which a cylindrical protrusion is provided; a stator whose lower portion is supported on top of the protrusion and is sealed by the lower case; a stator case that is formed of an annular trench shape that seals the inner circumferential portion; a rotational shaft whose lower portion is rotatably supported by a groove; a rotor placed at the upper-inner circumferential portion of the stator case and at the center of which the rotational shaft is coupled to thus rotate according to an action with respect to the stator; and an upper case coupled with the lower case in an inverted cup shape.”

Claims

1. A water pump motor comprising:

a lower case on top of which a cylindrical protrusion is provided;

a stator whose lower portion is supported on top of the protrusion and is sealed by the lower case;

a stator case that is formed of an annular trench shape that seals the inner circumferential portion, outer circumferential portion and upper surface of the stator in which the lower portion which extends from the inner circumferential portion of the stator case is sealed by a circular sealing plate, and a groove is formed at the center of the stator case;

a rotational shaft whose lower portion is rotatably supported by the groove;

a rotor that is placed at the upper-inner circumferential portion of the stator case and at the center of which the rotational shaft is coupled to thus rotate according to an action with respect to the stator; and

an upper case that is coupled with the lower case in an inverted cup shape so as to seal the upper surface and lateral surface of the stator case.

2. The water pump motor according to claim 1, wherein the upper case further comprises:

a flange that is bent at right angles and that is extensively formed in the same length as that of the lower case; and

a fastening unit that fastens the flange and the lower case.

3. The water pump motor according to claim 1, wherein the rotor comprises:

a back yoke that creates a magnetic circuit and at the center of which the rotational shaft is coupled; and

a main magnet that is formed of a ring shape so as to be coupled on the outer circumference of the back yoke and that is dividedly magnetized into a number of magnetic poles.

4. The water pump motor according to claim 3, further comprising:

a number of sub-magnets that are made into the same number of the number of the dividedly magnetized magnetic poles, and that are positioned adjacent to the back yoke and the main magnet.

5. The water pump motor according to claim 4, further comprising:

a rotor support that is formed on the top and bottom surfaces of the back yoke and the main magnet for integration.

6. The water pump motor according to claim 1, further comprising:

a middle case that is made into a circular plate shape on top of the inner circumferential portion of the stator case and that covers the rotor in a sealing state, in which the upper portion of the rotational shaft is rotatably supported at the center of the middle case.

7. The water pump motor according to claim 1, further comprising:

a lower bearing that is installed in the groove of the stator case to thereby rotatably support the rotational shaft; and

an upper bearing that is installed at the center of the upper case to thereby rotatably support the rotational shaft.

8. The water pump motor according to claim 1, further comprising:

a control printed circuit board (PCB) whose outer circumferential portion is supported between the stator and the protrusion of the lower case, to thereby apply a drive signal for coil of the stator.

9. The water pump motor according to claim 1, wherein the stator is characterized in that coil is wound on a number of T-shaped teeth and then sealing resin is molded into the outer circumferential portion.

10. The water pump motor according to claim 1, wherein the rotor comprises:

a circular rod-shaped back yoke at the center of which the rotational shaft is coupled, on the outer circumferential surface of which a number of grooves are formed at regular intervals, and that creates a magnetic circuit;

a number of sub-magnets that are inserted and disposed into the number of the grooves of the back yoke; and

a main magnet that is coupled on the outer circumferential portion of the back yoke in a ring shape and that is dividedly magnetized to have the same number of magnetic poles as that of the sub-magnets.

11. The water pump motor according to claim 1, wherein the rotor comprises:

a circular rod-shaped back yoke at the center of which the rotational shaft is coupled, and that creates a magnetic circuit;

a main magnet that is coupled on the outer circumferential portion of the back yoke in a ring shape, that is dividedly magnetized into a number of magnetic poles as that of the sub-magnets, and on the inner circumferential portion of which a groove is formed for each magnetic pole; and

a number of sub-magnets that are made into the same number as that of the dividedly magnetized magnetic poles and that are inserted into the grooves.

12. The water pump motor according to claim 10, wherein the sub-magnets are made into anisotropic magnet pieces and the main magnet is made into isotropic magnet pieces.

13. A water pump comprising:

a lower case on top of which a cylindrical protrusion is provided;

a stator whose lower portion is supported on top of the protrusion and is sealed by the lower case;

a stator case that is formed of an annular trench shape that seals the inner circumferential portion, outer circumferential portion and upper surface of the stator in which the lower portion which extends from the inner circumferential portion of the stator case is sealed by a circular sealing plate, and a groove is formed at the center of the stator case;

a rotational shaft whose lower portion is rotatably supported by the groove;

a rotor that is placed at the upper-inner circumferential portion of the stator case and at the center of which the rotational shaft is coupled to thus rotate according to an action with respect to the stator;

an upper case that is coupled with the lower case in an inverted cup shape so as to seal the upper surface and lateral surface of the stator case;

an impeller that is coupled with the rotational shaft that is extended to the upper portion of the upper case and that comprises a number of wings that are radially formed from the central shaft of the impeller; and

a pump drain housing that contains the impeller therein, whose lower portion is coupled with the upper case, and that guides a fluid flow path from the top portion to the later portion.

14. The water pump according to claim 13, wherein the rotor comprises;

a back yoke that creates a magnetic circuit; and

an isotropic main magnet that is formed of a ring shape so as to be coupled on the back yoke and that is dividedly magnetized into a number of magnetic poles.

15. The water pump according to claim 14, wherein the rotor further comprises:

a number of anisotropic sub-magnets that are made into the same number as that of the dividedly magnetized magnetic poles of the isotropic main magnet, and that are disposed adjacent to the back yoke and the isotropic main magnet.

16. The water pump according to claim 14, wherein the rotor is integrally formed on top and bottom surfaces of the back yoke and the isotropic main magnet in an insert-molding method using resin.

17. The water pump according to claim 13, further comprising:

a middle case that is made into a circular plate shape on top of the inner circumferential portion of the stator case and that covers the rotor in a sealing state, in which the upper portion of the rotational shaft is rotatably supported at the center of the middle case.

18. The water pump according to claim 13, wherein the impeller comprises:

a coupler that is positioned at the center of the impeller;

a coupling hole that is positioned at the center of the coupler and that fixedly couples the rotational shaft;

a number of wings that are radially formed around the coupler;

a circular plate that supports the lower portions of the number of the wings; and

a number of blades that are formed on the lower surface of the circular plate.