US20080159882A1 - Motor-fan unit with thermal device - Google Patents
Motor-fan unit with thermal device Download PDFInfo
- Publication number
- US20080159882A1 US20080159882A1 US11/647,951 US64795106A US2008159882A1 US 20080159882 A1 US20080159882 A1 US 20080159882A1 US 64795106 A US64795106 A US 64795106A US 2008159882 A1 US2008159882 A1 US 2008159882A1
- Authority
- US
- United States
- Prior art keywords
- motor
- fan unit
- thermal device
- fan
- cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
Definitions
- the present invention generally relates to motor-fan units. More particularly, the present invention relates to the placement of a thermal device within a motor-fan unit. Most particularly, the present invention relates to a motor-fan unit having a thermal device assembly that is mounted in a cavity in a motor bracket portion, sandwiched between the motor bracket portion and the field laminations of the motor-fan unit.
- Motor-fan units In these motor-fan units, an electric motor is coupled with a fan to create a flow of air to be employed for any of a number of purposes, for example, to draw a vacuum. Often, the fan is used not only to produce a flow of useful air but also to provide cooling air to the motor.
- a fan mounted on a shaft driven by the motor draws air into a fan shroud to compress or pressurize the air. The pressurized air is released into the motor housing to flow across the motor windings to draw heat into the flow and exhaust it from the motor housing.
- Motor-fan unit 10 includes motor assembly 12 and fan assembly 14 .
- Motor-fan unit 10 includes electric motor 16 with an armature or winding 17 , commutator 18 , and brushes that provide a connection from the power source to commutator 18 and windings 17 .
- Shaft 20 is supported on suitable bearings such that it can freely rotate and is connected to commutator 18 so as to rotate therewith.
- a field coil 19 generates a magnetic field to cause the rotation.
- Motor assembly 12 is configured with commutator 18 closest to fan assembly 14 .
- Fan assembly 14 of motor-fan unit 10 includes fan 26 coupled to one end 27 of shaft 20 , as by nut, such that it rotates therewith.
- Fan assembly 14 is received by diffuser assembly 28 (a radial diffuser is shown, but other diffuser assemblies, such as a ported diffuser could be employed), and shroud 30 encapsulates both diffuser assembly 35 and fan 26 .
- shroud 30 is provided with axial port 31 , coaxial with axis A of shaft 20 , through which outside air is drawn by fan 26 .
- the motor assembly 12 includes an end plate assembly, generally indicated by the numeral 35 , to enclose the motor and support the brushes.
- the end plate assembly 35 generally includes a planar plate portion 36 , which may be annular as shown, and, a motor bracket portion 37 extending from the plate portion toward the motor 16 .
- the bracket portion 37 is adapted to support the motor assembly 15 .
- motor-fan units may be sealed or unsealed systems, and may permit differing degrees of air flow through the system.
- each system builds up heat that can destroy motor parts if permitted to build, and, therefore, thermal devices are often employed to monitor the temperature or amperage or both of a motor-fan unit and shut down the motor when the temperature being monitored rises above a set selected threshold.
- the thermal device 40 is mounted to the field coil 19 with MylarTM tape 41 and cable ties 42 , and is used to monitor the heat and/or amperage at the field coil 19 .
- the field coil 19 does get hot as the motor-fan unit is operated, its heat does not accurately correspond with the heat building up in the motor-fan unit as a whole.
- the field coil is significantly cooler than in open systems where the motor-fan unit runs at higher amps. Nevertheless, the heat build up in the sealed system is often greater than that built up in the open system because the heat cannot easily escape from the sealed system.
- monitoring the temperature and/or amperage at the field coil is not necessarily advisable nor is it necessarily very accurate in conveying information about the actual heat build up in the system.
- the mounting of the thermal device with cable ties and tape adds additional manufacturing complication and cost.
- the thermal device should monitor an area of the motor-fan unit that more accurately reflects the heat building up in the system, and should be mounted in a manner more easily and inexpensively manufactured.
- a motor-fan unit comprising: an end plate assembly having a motor bracket portion providing a cavity, field laminations axially displaced from and located adjacent said cavity, and a thermal device having a mount end inserted into said cavity, said thermal device being secured to the motor-fan unit through a frictional fit established by the contact between said thermal device and said cavity and said field laminations.
- FIG. 1 is a partially sectioned front elevational view of a prior art motor-fan unit with the left half of the cover removed to show details of the motor assembly, end plate assembly, diffuser assembly, and fan assembly;
- FIG. 2 is a bottom plan view of a prior art thermal device mounting to a motor-fan unit as in FIG. 1 ;
- FIG. 3 is a side elevation view of the mounting of a thermal device to a motor-fan unit in accordance with this invention
- FIG. 4 is an exploded view of a portion of the motor bracket portion of the motor-fan unit of this invention, shown contoured to receive a thermal device in accordance with this invention.
- FIG. 5 is a bottom plan view of the mounting of a thermal device to a motor-fan unit as in FIG. 4 .
- a motor-fan unit in accordance with this invention is designated by the numeral 110 .
- the motor-fan unit 110 is substantially identical to the motor-fan unit 10 of the prior art as shown in FIG. 1 . Thus, many elements of the motor-fan unit 110 need not be repeated here. Rather, the focus here is on the mounting of a thermal device 200 to the motor-fan unit 110 .
- the thermal device 200 is received, at a mount end 202 thereof, in motor bracket portion 137 of end plate assembly 135 . More particularly, the motor bracket portion 137 is bowed outwardly as at 138 to provide a cavity 150 that can receive the mount end 202 of the thermal device 200 . The remainder of the thermal device 200 extends out of the cavity 150 along side the field laminations 152 . Preferably a frictional fit is established between mount end 202 and bowed portion 138 and field laminations 152 .
- a sensor 204 is mounted at the field laminations 152 , and is enclosed in a Mylar pocket 206 . As seen in FIG. 6 , the thermal device 200 and field laminations 152 can both be enclosed in a foam sleeve 208 , which may be held by cable tie 210 .
- the thermal device 200 measures the general ambient temperature at the locality where it is place, and does not inappropriately measure the amperage or temperature at the field coil. As a result, it is a more reliable thermal device, because it will not incorrectly process that the motor-fan unit is operating at an acceptable temperature, as it might if it were mounted to the field coil.
- the thermal device 200 and the adaptation made to motor bracket portion 137 also permit the thermal device 200 to be more easily mounted to a motor-fan unit, negating the need for taping and/or cable ties. This will decrease the cost of manufacture.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A motor-fan unit includes a thermal device serving to monitor the operating temperature of the motor-fan unit. The thermal device is secured to the motor-fan unit through a frictional fit between the thermal device and a cavity provided in an end plate assembly and the field laminations of the motor-fan unit.
Description
- The present invention generally relates to motor-fan units. More particularly, the present invention relates to the placement of a thermal device within a motor-fan unit. Most particularly, the present invention relates to a motor-fan unit having a thermal device assembly that is mounted in a cavity in a motor bracket portion, sandwiched between the motor bracket portion and the field laminations of the motor-fan unit.
- Electronic motors and generators are well known in the art and have been put to use in a variety of applications. One application is the handling of air by what will be termed herein as a “motor-fan unit.” In these motor-fan units, an electric motor is coupled with a fan to create a flow of air to be employed for any of a number of purposes, for example, to draw a vacuum. Often, the fan is used not only to produce a flow of useful air but also to provide cooling air to the motor. A fan mounted on a shaft driven by the motor draws air into a fan shroud to compress or pressurize the air. The pressurized air is released into the motor housing to flow across the motor windings to draw heat into the flow and exhaust it from the motor housing.
- Referring to
FIG. 1 , a motor-fan unit is generally indicated by thenumeral 10. Motor-fan unit 10 includesmotor assembly 12 andfan assembly 14. Motor-fan unit 10 includeselectric motor 16 with an armature or winding 17,commutator 18, and brushes that provide a connection from the power source tocommutator 18 andwindings 17. Shaft 20 is supported on suitable bearings such that it can freely rotate and is connected tocommutator 18 so as to rotate therewith. Afield coil 19 generates a magnetic field to cause the rotation. -
Motor assembly 12 is configured withcommutator 18 closest tofan assembly 14.Fan assembly 14 of motor-fan unit 10 includesfan 26 coupled to oneend 27 ofshaft 20, as by nut, such that it rotates therewith.Fan assembly 14 is received by diffuser assembly 28 (a radial diffuser is shown, but other diffuser assemblies, such as a ported diffuser could be employed), andshroud 30 encapsulates bothdiffuser assembly 35 andfan 26. As known in the art,shroud 30 is provided withaxial port 31, coaxial with axis A ofshaft 20, through which outside air is drawn byfan 26. Asshaft 20 and thusfan 26 is rotated bymotor 16,fan 26 draws in air atport 31 and forces the air throughdiffuser assembly 35, which is configured to distribute air as needed according to the desired use of motor-fan unit 10. Themotor assembly 12 includes an end plate assembly, generally indicated by thenumeral 35, to enclose the motor and support the brushes. Theend plate assembly 35 generally includes aplanar plate portion 36, which may be annular as shown, and, amotor bracket portion 37 extending from the plate portion toward themotor 16. Thebracket portion 37 is adapted to support the motor assembly 15. - These motor-fan units may be sealed or unsealed systems, and may permit differing degrees of air flow through the system. A more open system, with good air through flow, typically runs at high amps, while a more sealed system, with poorer air through flow, runs at lower amps. In operation, each system builds up heat that can destroy motor parts if permitted to build, and, therefore, thermal devices are often employed to monitor the temperature or amperage or both of a motor-fan unit and shut down the motor when the temperature being monitored rises above a set selected threshold.
- As shown in
FIG. 2 , in the prior art, the thermal device 40 is mounted to thefield coil 19 with Mylar™ tape 41 andcable ties 42, and is used to monitor the heat and/or amperage at thefield coil 19. However, while thefield coil 19 does get hot as the motor-fan unit is operated, its heat does not accurately correspond with the heat building up in the motor-fan unit as a whole. For instance, in a sealed system in which the motor-fan unit runs as low amps, the field coil is significantly cooler than in open systems where the motor-fan unit runs at higher amps. Nevertheless, the heat build up in the sealed system is often greater than that built up in the open system because the heat cannot easily escape from the sealed system. Thus, monitoring the temperature and/or amperage at the field coil is not necessarily advisable nor is it necessarily very accurate in conveying information about the actual heat build up in the system. Additionally, the mounting of the thermal device with cable ties and tape adds additional manufacturing complication and cost. - Thus, there exists a need in the art for a new concept for the placement of a thermal device in a motor-fan unit. The thermal device should monitor an area of the motor-fan unit that more accurately reflects the heat building up in the system, and should be mounted in a manner more easily and inexpensively manufactured.
- A motor-fan unit comprising: an end plate assembly having a motor bracket portion providing a cavity, field laminations axially displaced from and located adjacent said cavity, and a thermal device having a mount end inserted into said cavity, said thermal device being secured to the motor-fan unit through a frictional fit established by the contact between said thermal device and said cavity and said field laminations. Independent claims to be added before filing.
-
FIG. 1 is a partially sectioned front elevational view of a prior art motor-fan unit with the left half of the cover removed to show details of the motor assembly, end plate assembly, diffuser assembly, and fan assembly; -
FIG. 2 is a bottom plan view of a prior art thermal device mounting to a motor-fan unit as inFIG. 1 ; -
FIG. 3 is a side elevation view of the mounting of a thermal device to a motor-fan unit in accordance with this invention; -
FIG. 4 is an exploded view of a portion of the motor bracket portion of the motor-fan unit of this invention, shown contoured to receive a thermal device in accordance with this invention; and -
FIG. 5 is a bottom plan view of the mounting of a thermal device to a motor-fan unit as inFIG. 4 . - Referring now to
FIGS. 3-5 , it can be seen that a motor-fan unit in accordance with this invention is designated by thenumeral 110. The motor-fan unit 110 is substantially identical to the motor-fan unit 10 of the prior art as shown inFIG. 1 . Thus, many elements of the motor-fan unit 110 need not be repeated here. Rather, the focus here is on the mounting of athermal device 200 to the motor-fan unit 110. - As can be seen, the
thermal device 200 is received, at a mount end 202 thereof, inmotor bracket portion 137 ofend plate assembly 135. More particularly, themotor bracket portion 137 is bowed outwardly as at 138 to provide a cavity 150 that can receive the mount end 202 of thethermal device 200. The remainder of thethermal device 200 extends out of the cavity 150 along side thefield laminations 152. Preferably a frictional fit is established between mount end 202 and bowedportion 138 andfield laminations 152. A sensor 204 is mounted at thefield laminations 152, and is enclosed in a Mylarpocket 206. As seen inFIG. 6 , thethermal device 200 andfield laminations 152 can both be enclosed in afoam sleeve 208, which may be held bycable tie 210. - The
thermal device 200, particularly the sensor 204, measures the general ambient temperature at the locality where it is place, and does not inappropriately measure the amperage or temperature at the field coil. As a result, it is a more reliable thermal device, because it will not incorrectly process that the motor-fan unit is operating at an acceptable temperature, as it might if it were mounted to the field coil. Thethermal device 200 and the adaptation made tomotor bracket portion 137 also permit thethermal device 200 to be more easily mounted to a motor-fan unit, negating the need for taping and/or cable ties. This will decrease the cost of manufacture. - In light of the foregoing, it should thus be evident that the process of the present invention, providing a motor-fan unit with a thermal device, substantially improves the art. While, in accordance with the patent statutes, only the preferred embodiments of the present invention have been described in detail herein above, the present invention is not to be limited thereto or thereby. Rather, the scope of the invention shall include all modifications and variations that fall within the scope of the attached claims.
Claims (1)
1. A motor-fan unit comprising:
an end plate assembly having a motor bracket portion providing a cavity;
field laminations axially displaced from and located adjacent said cavity; and
a thermal device having a mount end inserted into said cavity, said thermal device being secured to the motor-fan unit through a frictional fit established by the contact between said thermal device and said cavity and said field laminations.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/647,951 US20080159882A1 (en) | 2006-12-29 | 2006-12-29 | Motor-fan unit with thermal device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/647,951 US20080159882A1 (en) | 2006-12-29 | 2006-12-29 | Motor-fan unit with thermal device |
Publications (1)
Publication Number | Publication Date |
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US20080159882A1 true US20080159882A1 (en) | 2008-07-03 |
Family
ID=39584234
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/647,951 Abandoned US20080159882A1 (en) | 2006-12-29 | 2006-12-29 | Motor-fan unit with thermal device |
Country Status (1)
Country | Link |
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US (1) | US20080159882A1 (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3319096A (en) * | 1964-11-16 | 1967-05-09 | Westinghouse Electric Corp | Thermally protected dynamoelectric machine |
US3875439A (en) * | 1973-09-17 | 1975-04-01 | Gen Electric | Mounting clip for a dynamoelectric machine |
US4313069A (en) * | 1980-02-26 | 1982-01-26 | Westinghouse Electric Corp. | Mounting for thermal protector used in dynamoelectric machine stator windings |
US4894571A (en) * | 1988-10-07 | 1990-01-16 | Emerson Electric Co. | Apparatus for making electrical connections in a dynamoelectric machine |
US4914329A (en) * | 1988-10-07 | 1990-04-03 | Emerson Electric Co. | Ventilation air flow block in an electric motor |
US5861689A (en) * | 1996-05-29 | 1999-01-19 | Emerson Electric Co. | Leadless motor construction |
US20080156961A1 (en) * | 2006-12-29 | 2008-07-03 | David Finkenbinder | Vibration isolation mount for a motor assembly |
-
2006
- 2006-12-29 US US11/647,951 patent/US20080159882A1/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3319096A (en) * | 1964-11-16 | 1967-05-09 | Westinghouse Electric Corp | Thermally protected dynamoelectric machine |
US3875439A (en) * | 1973-09-17 | 1975-04-01 | Gen Electric | Mounting clip for a dynamoelectric machine |
US4313069A (en) * | 1980-02-26 | 1982-01-26 | Westinghouse Electric Corp. | Mounting for thermal protector used in dynamoelectric machine stator windings |
US4894571A (en) * | 1988-10-07 | 1990-01-16 | Emerson Electric Co. | Apparatus for making electrical connections in a dynamoelectric machine |
US4914329A (en) * | 1988-10-07 | 1990-04-03 | Emerson Electric Co. | Ventilation air flow block in an electric motor |
US5861689A (en) * | 1996-05-29 | 1999-01-19 | Emerson Electric Co. | Leadless motor construction |
US20080156961A1 (en) * | 2006-12-29 | 2008-07-03 | David Finkenbinder | Vibration isolation mount for a motor assembly |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: AMETEK, INC., OHIO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FINKENBINDER, DAVID B.;REEL/FRAME:019056/0092 Effective date: 20070316 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |