GB2073958A - Fan assembly - Google Patents

Fan assembly Download PDF

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Publication number
GB2073958A
GB2073958A GB8105902A GB8105902A GB2073958A GB 2073958 A GB2073958 A GB 2073958A GB 8105902 A GB8105902 A GB 8105902A GB 8105902 A GB8105902 A GB 8105902A GB 2073958 A GB2073958 A GB 2073958A
Authority
GB
United Kingdom
Prior art keywords
stator
shaft
rotor
mounting portion
fan
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.)
Withdrawn
Application number
GB8105902A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UNION NGOK KEE ELECTRICAL Manufacturing
Original Assignee
UNION NGOK KEE ELECTRICAL Manufacturing
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by UNION NGOK KEE ELECTRICAL Manufacturing filed Critical UNION NGOK KEE ELECTRICAL Manufacturing
Priority to GB8105902A priority Critical patent/GB2073958A/en
Publication of GB2073958A publication Critical patent/GB2073958A/en
Withdrawn legal-status Critical Current

Links

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
    • F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
    • F04D25/062—Details of the bearings
    • 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
    • F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
    • F04D25/0633—Details of the magnetic circuit
    • 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
    • F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
    • F04D25/064—Details of the rotor
    • 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
    • F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
    • F04D25/0646—Details of the stator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/30—Structural association of asynchronous induction motors with auxiliary electric devices influencing the characteristics of the motor or controlling the motor, e.g. with impedances or switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1737—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotor around a fixed spindle; radially supporting the rotor directly
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

A fan assembly including a housing containing an electrical motor of the permanent split-phase capacitor type operating in a high slip condition. The motor has a cage rotor and a stator mounted within the rotor. An auxiliary ventilating fan, fast with the rotor, ventilates the motor housing. Main fan blading, fast with the rotor, ventilates a room in which the fan operates. The assembly includes a bearing holder with bearings, whereby the rotor is mounted for rotation about the stator. A shaft extends coaxially through the rotor and stetor. The stator and bearing mounting portions of the shaft form a series of steps of reducing diameter in a direction from the ceiling mounting portion to the bearing mounting portion. An end part of the bearing portion of the shaft is received in an end wall of a control housing which contains electrical controls for the motor. The control includes a potentiometer with an operating spindle co-axial with the shaft and which is rotated by a chain wheel. A ball-chain engages the wheel and passes through a guide mounted on the housing. <IMAGE>

Description

SPECIFICATION Fan assembly This invention relates to a fan assembly which may be embodied, for example, as a ceiling-mounted ventilating fan with a cast-iron or aluminium die-cast housing.
A conventional 52" (132cm) cast-iron housing fan for mounting on a ceiling is heavy and of large diameter. It uses an inside rotor and a shaded pole induction motor. It is not reversible, its efficiency is poor, it has a low power factor and its production costs are high. Despite this, such a ceiling fan is popular due to what may be termed its "classical housing" and its low operating speed (i.e. low r.p.m.). Whilst various attempts have been made to improve the performance, etc of this type of ceiling fan, the "classical housing" imposes design limitations on any improvement, for example, with regard to installing a different motor within the confines of the housing. Moreover, the need for a low operating speed usually means that up to 28 poles are required in a shaded pole motor, hence leading to increased production costs.If a different type of motor is used, such as a permanent split-phase capacitor motor, then the motor may need to be run in a high slip condition to achieve a low operating speed and this creates a further problem of increased temperature.
A permanent split-phase capacitor motor is preferred, because of its high power factor, high efficiency, reversibility and low production costs. Afurther disadvantage of some prior art ceiling fans is that their construction does not facilitate assembly or maintenance.
The present invention provides a ceiling fan subassembly comprising an electrical motor having a cage rotor and a stator mounted within the rotor, a shaft supporting the stator and co-axial with the rotor and the stator, the rotor supporting a fan and a bearing holder, bearings being provided in said holder for rotatably mounting the rotor on the shaft, the shaft including a ceiling mounting portion, which is located above the stator, and a bearing mounting portion, which is located below the stator, whereby the shaft extends co-axially through the stator, a stator mounting portion of the shaft and the bearing mounting portion of the shaft having a series of stepped portions of reducing diameter in a direction from the ceiling mounting portion to the bearing mounting portion whereby said stepped portions are received within respective apertures of reducing diameter in the stator and said bearings.
The present invention also provides a ceiling fan assembly comprising a split-phase capacitor motor having a cage rotor and a stator mounted within the rotor; a shaft supporting the stator and being co-axial with the rotor and the stator; the rotor supporting an auxiliary ventilating fan; a housing for said rotor, said stator and said auxiliary ventilating fan; main fan blading fast with said rotor; a bearing holder; and bearings provided in said holder for rotatably mounting the rotor on the shaft; said shaft including a ceiling mounting portion located above the stator, a stator mounting portion level with the stator, and a bearing mounting portion located below the stator, whereby the shaft extends coaxially through the stator; the stator and bearing mounting portions of the shaft being stepped with respect to the ceiling mounting portion of the shaft and with respect to each other so as to provide stepped portions of reducing diameter in a direction from the ceiling mounting portion to the bearing mounting portion, said stepped portions being received within respective apertures of reducing diameter in the stator and within said bearings.
Besides the advantages of using a permanent split-phase capacitor motor, which runs at a satisfactory operating temperature due to the additional ventilating fan, manufacture, installation of component parts and maintenance are facilitated. Moreover, reverse operation can be easily obtained. The invention can thus be embodied to provide an assembly with a permanent split-phase capacitor motor, operating in high slip condition, in a "classical housing", without risk of damage due to high temperature under operating conditions. Use of such a motor enables the number of poles to be reduced. For example, only 18 poles may be required in order to operate at low r.p.m. As the motor operates in a high slip condition, the use of an auxiliary fan, which is fast with the rotor, ventilates the housing and reduces the operating temperature to a low level.
In a preferred embodiment of the invention, the bearing portion of the shaft terminates in a free end which is received in an end wall of a control housing containing a control for the motor. The control is preferably of a rotary type having a rotatable spindle mounted co-axially with the shaft which supports the stator and the rotor. The spindle is fast with a chain wheel and the control includes a chain, such as a ball chain, which engages with the chain wheel and passes through a side wall of the control housing. A suitable control includes a conventional stepless solid state regulator including a potentiometer operated by the spindle. Suitably, the control includes means for reversing the electrical connections to the stator.
An embodiment of the invention will now be described with reference to the accompanying drawings, in which: Figure 1 is a sectional elevation through a fan assembly according to an example of the invention.
Figures 2a and 2b respectively show a fan used in the assembly, as seen end-on and in cross-sectional elevation.
Figures 3-6 show parts of a chain-wheel control mechanism used in the assembly.
Referring to the drawings, a fan assembly comprises an electrical motor of the permanent, splitphase capacitor type, having a cage rotor 3 and a stator 2 mounted within the rotor. A stepped shaft 1 passes co-axially through the rotor and supports bearings in the form of ball races 6 which are received in respective ends of a sleeve-shaped portion 4a of a holder 4. The rest of the holder 4 extends radially of the sleeve-shaped portion 4a to provide a support for an auxiliary fan 5 and the cage rotor 3 which are secured by bolts as shown (Figure 1). The auxiliary fan 5 is provided to ventilate a housing 18 and to keep the motor cool as it operates in a high slip condition. Blades 19 (oniy partly shown due to the scale of the drawing) form the main fan which ventilates a room in which the ceiling fan operates.The blades 19 are secured by rivets or screws to respective cranked arms 20 which are in turn secured by screws 21 to the bearing holder 4.
The stator 2 is fixed in a cast-iron housing 2a also as shown (Figure 1). The housing 18 depends from a shaft 22 to which it is secured by means of a grub screw 23. Shaft 22 is secured to a ceiling rose (not shown) in accordance with conventional practice.
The end of shaft 1, adjacent the outermost bearing 6 is threaded and is received in a sleeve-shaped portion of an end wall of a control housing 8 which contains an electrical control including a potentiometer 14 and a switch 14a. Double left turin nuts 7 secure the threaded end of shaft 1. Potentiometer 14, which is part of a conventional stepless solid state regulator (not shown), has an operating spindle 15 co-axial with shaft 1. The operating spindle 15 is fast with a chain wheel 10 which rotates within a chain wheel holder 9 and which is engaged by a ball-chain 13 for manual adjustment. One end portion of the chain 13 passes through guide means including a leading screw 12 secured by a leading nut 11 as shown (Figure 1).The other end of the chain portion is not shown in the drawing but it also passes out through the leading screw and nut assembly as evident from Figure 5a. The position of the operating shaft is adjusted by pulling on the respective ends of chain 13.
The motor is reversible, as mentioned above, and its speed is controllable by pulling on the chain 13 to adjust the potentiometer 14. As the motor operates in a high-slip condition, its temperature will rise but the built-in fan keeps the assembly cool.
Figures 3a and 3b show the chain wheel holder 9 in plan and elevation and Figures 4a and 4b are similar views of the chain wheel 10. The leading screw 10 is similarly illustrated in Figures 5a and 5b, showing a pair of bores 16, forthe respective end portions of the chain 13. Figure 6 illustrates the leading nut 11.
The control housing 8 facilitates the installation of the electrical or electronic controls for the motor and is convenient to use because it is self-contained and it may be attached directly to the free end of shaft 1 with minimum electrical connections being made to the motor. Hence various types of control can be easily fitted.

Claims (10)

1. A ceiling fan sub-assembly comprising an electrical motor having a cage rotor and a stator mounted within the rotor, a shaft supporting the stator and co-axial with the rotor and the stator, the rotor supporting a fan and a bearing holder, bearings being provided in said holder for rotatably mounting the rotor on the shaft, the shaft including a ceiling mounting portion, which is located above the stator, and a bearing mounting portion, which is located below the stator, whereby the shaft extends co-axially through the stator, a stator mounting portion of the shaft and the bearing mounting portion of the shaft having a series of stepped portions of reducing diameter in a direction from the ceiling mounting portion to the bearing mounting portion whereby said stepped portions are received within respective apertures of reducing diameter in the stator and said bearings.
2. A ceiling fan assembly comprising a splitphase capacitor motor having a cage rotor and a stator mounted within the rotor; a shaft supporting the stator and being co-axial with the rotor and the stator; the rotor supporting an auxiliary ventilating fan; a housing for said rotor, said stator and said auxiliary ventilating fan; main fan blading fast with said rotor; a bearing holder; and bearings provided in said holder for rotatably mounting the rotor on the shaft; said shaft including a ceiling mounting portion located above the stator, a stator mounting portion level with the stator, and a bearing mounting portion located below the stator, whereby the shaft extends co-axially through the stator; the stator and bearing mounting portions of the shaft being stepped with respect to the ceiling mounting portion of the shaft and with respect to each other so as to provide stepped portions of reducing diameter in a direction from the ceiling mounting portion to the bearing mounting portion, said stepped portions being received within respective apertures of reducing diameter in the stator and within said bearings.
3. A sub-assembly according to claim 1 or an assembly according to claim 2, wherein the bearing portion of the shaft terminates in a free end which is received in an end wall of a control housing which contains a control for said motor.
4. A sub-assembly or assembly according to claim 3, wherein the control is of a rotary type having a rotatable shaft which is mounted co-axially with the shaft which supports the stator and the rotor, said rotatable shaft being fast with a chain wheel and the control including a chain, which engages with the chain wheel, passing through a side wall of said control housing.
5. A sub-assembly or assembly according to claim 4, wherein said control comprises a stepless said state regulator which includes a potentiometer operable by said rotatable shaft.
6. A sub-assembly or assembly according to any one of claims 3-5 wherein said control includes means for reversing electrical connections to the stator.
7. A ceiling fan assembly substantially as herein described with reference to the accompanying drawings.
New claims or amendments to claims filed on SL1 sent 817181.
New or amended claims:
8. A control assembly comprising an operating shaft rotatably mounted within a housing; a chain wheel fast with said shaft; and a chain engaging said chain wheel for adjusting the annular position of said shaft.
9. A control assembly according to claim 8 wherein the chain wheel is mounted for rotation adjacent a chain wheel holder, the chain being located between the chain wheel and the chain wheel holder and having end portions which pass through guide means mounted on the housing.
10. A control assembly according to claim 9 wherein the chain is a ball-chain.
GB8105902A 1980-02-26 1981-02-25 Fan assembly Withdrawn GB2073958A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8105902A GB2073958A (en) 1980-02-26 1981-02-25 Fan assembly

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8006426 1980-02-26
GB8105902A GB2073958A (en) 1980-02-26 1981-02-25 Fan assembly

Publications (1)

Publication Number Publication Date
GB2073958A true GB2073958A (en) 1981-10-21

Family

ID=26274613

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8105902A Withdrawn GB2073958A (en) 1980-02-26 1981-02-25 Fan assembly

Country Status (1)

Country Link
GB (1) GB2073958A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2172936A (en) * 1985-03-23 1986-10-01 Smiths Industries Plc Fan having individually mounted blades
AU619453B2 (en) * 1987-03-11 1992-01-30 Skf Industrial Trading And Development Company B.V. Ceiling fan
EP0823554A1 (en) * 1996-08-07 1998-02-11 Hunter Fan Company Ceiling fan motor
US7066721B2 (en) 2003-06-11 2006-06-27 Hunter Fan Company Ceiling fan motors

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2172936A (en) * 1985-03-23 1986-10-01 Smiths Industries Plc Fan having individually mounted blades
AU619453B2 (en) * 1987-03-11 1992-01-30 Skf Industrial Trading And Development Company B.V. Ceiling fan
EP0823554A1 (en) * 1996-08-07 1998-02-11 Hunter Fan Company Ceiling fan motor
US5883449A (en) * 1996-08-07 1999-03-16 Hunter Fan Company Ceiling fan motors
US7066721B2 (en) 2003-06-11 2006-06-27 Hunter Fan Company Ceiling fan motors

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)