US20040205887A1 - Variable speed electrical motor with separate start windings and without centrifugal switch - Google Patents

Variable speed electrical motor with separate start windings and without centrifugal switch Download PDF

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Publication number
US20040205887A1
US20040205887A1 US10763605 US76360504A US2004205887A1 US 20040205887 A1 US20040205887 A1 US 20040205887A1 US 10763605 US10763605 US 10763605 US 76360504 A US76360504 A US 76360504A US 2004205887 A1 US2004205887 A1 US 2004205887A1
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Prior art keywords
water
speed
motor
switch
electrical
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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
Application number
US10763605
Inventor
Casey Loyd
Pedro Vargas
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Lloyds IP Holdings LLC
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CALIFORNIA ACRYLIC INDUSTRIES
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K17/00Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02Asynchronous induction motors
    • H02K17/30Structural 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

Abstract

A variable speed electrical motor has windings and a rotor disposed within a motor housing. The motor is capable of operating at one of a plurality of discrete operating speeds. The electrical circuitry for each speed includes both a start winding for only that speed and a start capacitor for only that speed. In an optional embodiment, a switch for varying the speed of the rotor is disposed at a location external of the motor housing. The variable speed electric motor is ideal for use in a water recreational combination, such as a spa, hot tub or recirculating bath tub.

Description

    FIELD OF THE INVENTION
  • This invention relates generally to electrical motors and, more specifically, to variable speed motors. [0001]
  • BACKGROUND OF THE INVENTION
  • Variable speed electrical motors are very popular for a wide range of uses. Typically, the switch mechanism which provides the motor with the capability of switching between two or more speeds is disposed on the rotating rotor portion of the motor, within the motor housing. Such switch mechanisms necessarily rotate as the rotor rotates. To connect the rotating switch to control wiring, some sort of brush and ring configuration must be provided. [0002]
  • One problem with such variable speed electrical motors is that the switching mechanism frequently fails. Also, the brush and ring configuration is prone to failure. In both cases, repair of the motor is awkward, time-consuming and expensive. [0003]
  • Another problem with such variable speed electrical motors arises when the user attempts to change the speed of the motor to a faster setting. With conventional variable speed motors, this action results in a momentary large increase in power consumption in the motor as the motor attempts to overcome inertial forces and ramp up the rotation of the rotor to the faster speed in a very short period of time. Such sudden increase in power consumption causes a large “spike” of required amperage to the windings and frequently trips out one of the thermal protectors on the motor. This results in a frustrating shutting down of the motor. [0004]
  • Accordingly, there is a need for a variable speed electrical motor which avoids this problem in the prior art. [0005]
  • SUMMARY OF THE INVENTION
  • The invention satisfies this need. In one embodiment of the invention, the invention is a variable speed electrical motor capable of operating at one of a plurality of discrete operating speeds. In the invention, the electrical circuitry for each speed includes both a start winding for only that speed and a start capacitor for only that speed. [0006]
  • In another embodiment of the invention, the invention comprises the variable speed electrical motor described above in combination with a switch for varying the speed of the motor, wherein the switch is disposed external of the motor housing.[0007]
  • DESCRIPTION OF THE DRAWINGS
  • These and other features, aspects and advantages of the present invention will become better understood with reference to the following description, appended claims and accompanying drawings where: [0008]
  • FIG. 1 is an isometric view of an electrical motor combination having features of the invention; [0009]
  • FIG. 2 is a side view of a water recreational combination employing the electrical motor combination illustrated in FIG. 1; [0010]
  • FIG. 3 is an electrical circuit diagram of a variable speed electrical motor having features of the invention; and [0011]
  • FIG. 4 is a electrical circuit diagram for a variable speed motor of the prior art.[0012]
  • DETAILED DESCRIPTION
  • The following discussion describes in detail one embodiment of the invention and several variations of that embodiment. This discussion should not be construed, however, as limiting the invention to those particular embodiments. Practitioners skilled in the art will recognize numerous other embodiments as well. [0013]
  • The invention is an electrical motor combination [0014] 10 comprising a variable speed electrical AC induction motor 12 and a switch 14 for varying the speed of the motor 12.
  • The electrical motor [0015] 12 has windings and a rotor (not shown) disposed within a motor housing 16. Contrary to electrical AC induction motors of the prior art, the electrical motor 12 of the invention 10 has no speed-varying switch disposed within the motor housing 16. The switch 14 for varying the speed of the motor 12 is disposed external of the motor housing 16. The switch 14 is typically disposed within a separate switch box 18.
  • The electrical motor combination of the invention [0016] 10 is ideal for use in a water recreational combination 20 such as a spa, hot tub or recirculation bath tub. Such a water recreational combination 20 is described in co-pending U.S. patent application Ser. No. ______, filed Mar. 14, 2002, entitled ADJUSTABLE WATER THERAPY COMBINATION, the entire contents of which are incorporated herein by this reference.
  • FIG. 2 illustrates a typical portable spa [0017] 20 having a water basin 22 with side walls 24. Water is circulated from the bottom of the water basin 22 through water circulation lines 25, a centrifugal water pump 26 and back to the water basin 22, typically via water injection jets (not shown). The variable speed AC induction motor 12 is used to drive the water pump 26 so that water entering the water basin 22 via the water injection jets can be varied with respect to intensity and pulse characteristics. Speed control of the electrical motor 12 is accomplished by the switch 14 which is disposed within a switch box 18 external of the electrical motor 12. Main line operating power is wired to the switch box 18 via main power wires 28. Electrical motor power is provided from the switch box 18 to the electrical motor 12 via electrical motor input wires 30. The switch 14 within the switch box 18 controls the amount of main line power to the electrical motor 12. Control of the switch 14 can be made via a control panel (not shown) which is operably attached to the switch 14 within the switch box 18 by control wires 32. As illustrated in FIG. 2, the pump 26, water circulation lines 25, electrical motor 12 and switch box 18 can be conveniently located within a spa surround 34. Large doorways 36 within the spa surround 34 provide easy access to the pump 26, motor 12 and switch box 18 for maintenance purposes.
  • As can be readily appreciated, maintenance on or replacement of the switch [0018] 14 is easily accomplished within the invention because the electrical motor 12 does not have to be opened to obtain access to the switch 14. Rather, the switch 14 is easily accessed by simply opening the switch box 18.
  • In a preferred embodiment of the invention, the invention is the variable speed electrical motor [0019] 12 described immediately above in combination with a switch 14, such as previously described above, for varying the speed of the motor 12, wherein the switch 14 is disposed external of the motor housing 16.
  • In another preferred embodiment of the invention, the electrical motor [0020] 12 is a variable speed electrical motor capable of operating at one of a plurality of discrete operating speeds. In the invention, the electrical circuitry for each of the plurality of discrete operating speeds includes both a start winding 40 for only that speed and a start capacitor 42 for only that speed. Such a circuitry (for a two-speed electrical motor 12) is illustrated in FIG. 3. Such a circuitry is contrasted with the electrical circuitry of variable speed electrical motors of the prior art wherein there is only one start winding and only one start capacitor for the entirety of the motor. The circuitry for such a motor is illustrated in FIG. 4.
  • The invention successfully overcomes the aforementioned problems in the prior art. By providing a switch for varying the speed of the motor external of the motor housing, prior art problems with rotating switch contacts and brush and ring configurations are eliminated. Moreover, by providing a separate start winding and a separate start capacitor for each speed in the motor, large amperage “spikes” are eliminated when switching the motor from a lower speed to a higher speed. For example, in one embodiment of the invention, the switching from a low speed to a high speed setting only caused an amperage “spike” of about six amps, whereas, in an otherwise identical motor of the prior art, amperage “spikes” of 50 amps or more are frequently encountered. [0021]
  • Having thus described the invention, it should be apparent that numerous structural modifications and adaptations may be resorted to without departing from the scope and fair meaning of the instant invention as set forth hereinabove and as described hereinbelow by the claims. [0022]

Claims (6)

    What is claimed is:
  1. 1. A variable speed electrical motor capable of operating at one of a plurality of discrete operating speeds, wherein the electrical circuitry for each speed includes both a start winding for only that speed and a start capacitor for only that speed.
  2. 2. An electrical motor combination comprising:
    (a) a variable speed electrical motor capable of operating at one of a plurality of discrete operating speeds, wherein the electrical circuitry for each speed includes both a start winding for only that speed and a start capacitor for only that speed; and
    (b) a switch for varying the speed of the motor, wherein the switch is disposed external of the motor housing.
  3. 3. The electrical motor combination of claim 2 wherein the switch is disposed within a separate switch box.
  4. 4. The electrical motor combination of claim 1 wherein the combination is disposed within a water recreational combination, the water recreational combination comprising:
    (a) a water basin capable of retaining a human being partially submerged below a quantity of water;
    (b) a water pump having a suction side and a discharged side; and
    (c) water circulation conduits connecting the water basin to the suction side of the pump and connecting the discharge side of the pump to the water basin;
    wherein the electrical motor drives the water pump.
  5. 5. A water recreational combination comprising:
    (a) a water basin capable of retaining a human being partially submerged below a quantity of water;
    (b) a water pump having a suction side and a discharged side;
    (c) water circulation conduits connecting the water basin to the suction side of the pump and connecting the discharge side of the pump to the water basin;
    (d) a variable speed electrical AC induction motor for driving the water pump; and
    (e) a switch for varying the speed of the rotor, wherein the switch is disposed external of the motor housing in a separate switch box.
  6. 6. The water recreational combination of claim 5 wherein the water basin, the pump, the electrical motor and the switch box are enclosed within a spa surround.
US10763605 2002-05-08 2004-01-22 Variable speed electrical motor with separate start windings and without centrifugal switch Abandoned US20040205887A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US10142397 US20030208840A1 (en) 2002-05-08 2002-05-08 Variable speed electrical motor without centrifugal switch
US10763605 US20040205887A1 (en) 2002-05-08 2004-01-22 Variable speed electrical motor with separate start windings and without centrifugal switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10763605 US20040205887A1 (en) 2002-05-08 2004-01-22 Variable speed electrical motor with separate start windings and without centrifugal switch

Related Parent Applications (1)

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US10142397 Continuation-In-Part US20030208840A1 (en) 2002-05-08 2002-05-08 Variable speed electrical motor without centrifugal switch

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US20040205887A1 true true US20040205887A1 (en) 2004-10-21

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US10142397 Abandoned US20030208840A1 (en) 2002-05-08 2002-05-08 Variable speed electrical motor without centrifugal switch
US10763605 Abandoned US20040205887A1 (en) 2002-05-08 2004-01-22 Variable speed electrical motor with separate start windings and without centrifugal switch

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US10142397 Abandoned US20030208840A1 (en) 2002-05-08 2002-05-08 Variable speed electrical motor without centrifugal switch

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CA (1) CA2428394A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2534011C2 (en) * 2009-09-04 2014-11-27 Макита Корпорейшн Rpm variator switch

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8473110B2 (en) * 2008-11-25 2013-06-25 Regal Beloit America, Inc. Systems and methods for controlling operation of a motor

Citations (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1082989A (en) * 1913-05-21 1913-12-30 John Baxter Closure for milk-jars and the like.
US1743772A (en) * 1926-07-02 1930-01-14 Gen Electric Multispeed motor control system
US2784362A (en) * 1955-11-17 1957-03-05 Robbins & Myers Electric motor circuits
US4066937A (en) * 1976-01-13 1978-01-03 Lennox Industries, Inc. Control circuit for a two speed single phase motor
US4082989A (en) * 1976-01-13 1978-04-04 Lennox Ind Inc Switching contactor circuit for five-lead two-speed single-phase motor
US4100917A (en) * 1976-10-18 1978-07-18 Dazey Products Co. Hydrotherapy unit
US4263540A (en) * 1979-07-05 1981-04-21 General Electric Company Two-speed refrigerant motor compressor
US4348626A (en) * 1980-09-16 1982-09-07 General Electric Company Two-speed single phase motor with centrifugal switch
US4382218A (en) * 1982-06-30 1983-05-03 Stratford Manufacturing, Inc. Speed control for fan motor
US4453118A (en) * 1982-11-08 1984-06-05 Century Electric, Inc. Starting control circuit for a multispeed A.C. motor
US4532458A (en) * 1980-09-26 1985-07-30 National Research Development Corporation Variable-speed electrical machines
US4614904A (en) * 1983-09-30 1986-09-30 Ebara Corporation Capacitor-run dry type submersible motor assembly with a built-in starting capacitor
US4726917A (en) * 1985-07-23 1988-02-23 Abe, Co., Ltd. Water current and air bubble generating apparatus for bath
US5056168A (en) * 1987-09-16 1991-10-15 Franz Kaldewei Gmbh & Co. Whirlpool bathtub
US5227710A (en) * 1989-12-28 1993-07-13 The Alexander J. Lewus Revocable Inter Vivos (Living) Trust Multiple speed single phase motor
US5300871A (en) * 1992-08-21 1994-04-05 Chien Luen Industries Company, Ltd., Inc. Dual capacitor speed control apparatus and method for electric motor
US5514943A (en) * 1994-07-18 1996-05-07 Carrier Corporation Multi-speed motor control system
US5548854A (en) * 1993-08-16 1996-08-27 Kohler Co. Hydro-massage tub control system
US5686806A (en) * 1994-12-19 1997-11-11 Trans-Coil, Inc. Low-pass filter and electronic speed control system for electric motors
US6078154A (en) * 1999-02-12 2000-06-20 Delco Electronics Corporation Circuitry for determining actuator position
US6121746A (en) * 1999-06-10 2000-09-19 General Electric Company Speed reduction switch
US6189171B1 (en) * 1999-03-16 2001-02-20 General Electric Company Washing machine having a variable speed motor
US6289530B1 (en) * 1999-04-14 2001-09-18 Mr. Tubs, Inc. Jetted laundry/utility/kitchen sink
US6295662B1 (en) * 1996-11-22 2001-10-02 Softub, Inc. Porous solenoid structure
US6346790B1 (en) * 2000-04-12 2002-02-12 Emerson Electric Co. Induction motor system with an induction motor and an electrically isolated voltage modulation motor controller
US6396674B1 (en) * 2000-04-11 2002-05-28 Ford Global Technologies, Inc. System and method for monitoring the operation of a power converter
US6412123B1 (en) * 2000-11-01 2002-07-02 Pleasure Time Products (Hong Kong) Limited Portable spa
US6933638B2 (en) * 2003-10-30 2005-08-23 A. O. Smith Corporation Electric motor having a reverse air flow cooling system
US7034426B2 (en) * 2002-06-25 2006-04-25 Miraculous Motors Corporation Electric motor windings
US7045979B2 (en) * 2003-02-28 2006-05-16 A.O. Smith Corporation Multiple-speed electric machine and method of operating the same

Patent Citations (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1082989A (en) * 1913-05-21 1913-12-30 John Baxter Closure for milk-jars and the like.
US1743772A (en) * 1926-07-02 1930-01-14 Gen Electric Multispeed motor control system
US2784362A (en) * 1955-11-17 1957-03-05 Robbins & Myers Electric motor circuits
US4066937A (en) * 1976-01-13 1978-01-03 Lennox Industries, Inc. Control circuit for a two speed single phase motor
US4082989A (en) * 1976-01-13 1978-04-04 Lennox Ind Inc Switching contactor circuit for five-lead two-speed single-phase motor
US4100917A (en) * 1976-10-18 1978-07-18 Dazey Products Co. Hydrotherapy unit
US4263540A (en) * 1979-07-05 1981-04-21 General Electric Company Two-speed refrigerant motor compressor
US4348626A (en) * 1980-09-16 1982-09-07 General Electric Company Two-speed single phase motor with centrifugal switch
US4532458A (en) * 1980-09-26 1985-07-30 National Research Development Corporation Variable-speed electrical machines
US4382218A (en) * 1982-06-30 1983-05-03 Stratford Manufacturing, Inc. Speed control for fan motor
US4453118A (en) * 1982-11-08 1984-06-05 Century Electric, Inc. Starting control circuit for a multispeed A.C. motor
US4614904A (en) * 1983-09-30 1986-09-30 Ebara Corporation Capacitor-run dry type submersible motor assembly with a built-in starting capacitor
US4726917A (en) * 1985-07-23 1988-02-23 Abe, Co., Ltd. Water current and air bubble generating apparatus for bath
US5056168A (en) * 1987-09-16 1991-10-15 Franz Kaldewei Gmbh & Co. Whirlpool bathtub
US5227710A (en) * 1989-12-28 1993-07-13 The Alexander J. Lewus Revocable Inter Vivos (Living) Trust Multiple speed single phase motor
US5300871A (en) * 1992-08-21 1994-04-05 Chien Luen Industries Company, Ltd., Inc. Dual capacitor speed control apparatus and method for electric motor
US5548854A (en) * 1993-08-16 1996-08-27 Kohler Co. Hydro-massage tub control system
US5514943A (en) * 1994-07-18 1996-05-07 Carrier Corporation Multi-speed motor control system
US5686806A (en) * 1994-12-19 1997-11-11 Trans-Coil, Inc. Low-pass filter and electronic speed control system for electric motors
US6295662B1 (en) * 1996-11-22 2001-10-02 Softub, Inc. Porous solenoid structure
US6078154A (en) * 1999-02-12 2000-06-20 Delco Electronics Corporation Circuitry for determining actuator position
US6189171B1 (en) * 1999-03-16 2001-02-20 General Electric Company Washing machine having a variable speed motor
US6289530B1 (en) * 1999-04-14 2001-09-18 Mr. Tubs, Inc. Jetted laundry/utility/kitchen sink
US6121746A (en) * 1999-06-10 2000-09-19 General Electric Company Speed reduction switch
US6396674B1 (en) * 2000-04-11 2002-05-28 Ford Global Technologies, Inc. System and method for monitoring the operation of a power converter
US6346790B1 (en) * 2000-04-12 2002-02-12 Emerson Electric Co. Induction motor system with an induction motor and an electrically isolated voltage modulation motor controller
US6412123B1 (en) * 2000-11-01 2002-07-02 Pleasure Time Products (Hong Kong) Limited Portable spa
US7034426B2 (en) * 2002-06-25 2006-04-25 Miraculous Motors Corporation Electric motor windings
US7045979B2 (en) * 2003-02-28 2006-05-16 A.O. Smith Corporation Multiple-speed electric machine and method of operating the same
US6933638B2 (en) * 2003-10-30 2005-08-23 A. O. Smith Corporation Electric motor having a reverse air flow cooling system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2534011C2 (en) * 2009-09-04 2014-11-27 Макита Корпорейшн Rpm variator switch

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US20030208840A1 (en) 2003-11-13 application
CA2428394A1 (en) 2003-11-08 application

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Effective date: 20040604

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