GB2024542A - Controlling Electric Fan Heaters - Google Patents

Controlling Electric Fan Heaters Download PDF

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Publication number
GB2024542A
GB2024542A GB7846167A GB7846167A GB2024542A GB 2024542 A GB2024542 A GB 2024542A GB 7846167 A GB7846167 A GB 7846167A GB 7846167 A GB7846167 A GB 7846167A GB 2024542 A GB2024542 A GB 2024542A
Authority
GB
United Kingdom
Prior art keywords
motor
supply
switch
heater element
circuit
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Withdrawn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
GB7846167A
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.)
Volex PLC
Original Assignee
Ward and Goldstone Ltd
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 Ward and Goldstone Ltd filed Critical Ward and Goldstone Ltd
Priority to GB7846167A priority Critical patent/GB2024542A/en
Publication of GB2024542A publication Critical patent/GB2024542A/en
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D20/00—Hair drying devices; Accessories therefor
    • A45D20/22—Helmets with hot air supply or ventilating means, e.g. electrically heated air current
    • A45D20/30—Electric circuitry specially adapted for hair drying devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/24—Variable impedance in stator or rotor circuit

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Direct Current Motors (AREA)
  • Cleaning And Drying Hair (AREA)

Abstract

A circuit particularly of use in a fan heater comprises a D.C. motor 26 for the fan, the-motor being connected through a half wave rectifier 24 across a part of a heater element 10. Either the whole or part of the heater element is connected to an A.C. supply by means of a sliding switch 14. Thus when the A.C. supply is connected across a part of the element by moving the switch to connect poles C, D the heat is increased and there is a corresponding increase in motor speed due to the increased potential applied to the motor. <IMAGE>

Description

SPECIFICATION Low Voltage D.C. Motors This invention relates to a low voltage D.C.
motor and associated circuiting for operating the motor by a higher voltage A.C. supply.
According to the invention there is provided a low voltage D.C. motor connected through a half wave rectifier circuit across a part of a heater element, the element being intended for connection to an A.C supply.
By the present invention, therefore, the voltage to the D.C. motor is reduced below the voltage of the A.C. supply by using the heater element, in effect, as a potentiometer.
The arrangement of the present invention is particularly intended for fan heaters such as hair driers where the motor drives a fan to produce a current of air over the heater element. It is preferred that such constructions should include means for altering the temperature of the heater element together with means for correspondingly altering the speed of the motor so that the hotter the element the greater the motor speed and viceversa. According to the present invention that is achieved by providing for the A.C. supply to be delivered across the whole or a part of the heater element. When the A.C. supply is switched from being connected across the whole element to a connection across a part of the element the heat energy produced is increased and the speed of the motor increases also.
A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawing which is a circuit diagram of an arrangement according to the invention.
Referring to the drawing the arrangement comprises a heater element 10 connected to one pole B of a switch generally indicated by reference numeral 14. The other end of heater 10 is connected to terminal 1 6 that being one of the terminals for an A.C. mains supply. The other terminal for the A.C. supply is referenced 1 8 and is connected to pole C of the switch 14. Pole D of the switch is connected to a tap 20 on the element 10, and pole A of the switch is unconnected. A further tap 22 on the element 10 is connected through a diode 24 and D.C. motor 26 to the terminal 16.
The device operates as follows: When poles A and B of the switch are connected together by sliding dolly 28 the device is inoperative. To switch on the device the dolly 28 is moved to connect poles B and C. In that condition the whole element is energised and half wave rectified current is supplied to the motor.
If now the dolly is moved to connect poles C and D the whole mains supply is then applied across only a part of the element so that greater heat energy is generated. Moreover, because the tap 22 is fixed the potential applied to the motor is increased and the motor speed increases.
It will be understood that the above described embodiment can be modified in many ways. For example the number of poles in the switch can be increased together with the number of tappings between the switch and the element so as to increase the number of heat settings and corresponding motor speeds above two.
Claims
1. A circuit comprising a low voltage D.C.
motor connected through a half wave rectifier circuit across a part of a heater element, the element being intended for connection to an A.C.
supply.
2. A circuit as claimed in Claim 1, wherein means are provided for connecting the A.C.
supply across a part or the whole of the heater element whereby when the A.C. supply is connected across a part of the heater element the D.C. potential applied to the motor is increased.
3. A circuit as claimed in Claim 1 or Claim 2, wherein means are provided for connecting the A.C. supply across a plurality of different parts of the heating element.
4. A circuit substantially as described herein with reference to the accompanying drawing.
5. A fan heater including a circuit as claimed in al,y preceding claim wherein the motor is arranged to drive a fan and direct a stream of air across the heater element.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Low Voltage D.C. Motors This invention relates to a low voltage D.C. motor and associated circuiting for operating the motor by a higher voltage A.C. supply. According to the invention there is provided a low voltage D.C. motor connected through a half wave rectifier circuit across a part of a heater element, the element being intended for connection to an A.C supply. By the present invention, therefore, the voltage to the D.C. motor is reduced below the voltage of the A.C. supply by using the heater element, in effect, as a potentiometer. The arrangement of the present invention is particularly intended for fan heaters such as hair driers where the motor drives a fan to produce a current of air over the heater element. It is preferred that such constructions should include means for altering the temperature of the heater element together with means for correspondingly altering the speed of the motor so that the hotter the element the greater the motor speed and viceversa. According to the present invention that is achieved by providing for the A.C. supply to be delivered across the whole or a part of the heater element. When the A.C. supply is switched from being connected across the whole element to a connection across a part of the element the heat energy produced is increased and the speed of the motor increases also. A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawing which is a circuit diagram of an arrangement according to the invention. Referring to the drawing the arrangement comprises a heater element 10 connected to one pole B of a switch generally indicated by reference numeral 14. The other end of heater 10 is connected to terminal 1 6 that being one of the terminals for an A.C. mains supply. The other terminal for the A.C. supply is referenced 1 8 and is connected to pole C of the switch 14. Pole D of the switch is connected to a tap 20 on the element 10, and pole A of the switch is unconnected. A further tap 22 on the element 10 is connected through a diode 24 and D.C. motor 26 to the terminal 16. The device operates as follows: When poles A and B of the switch are connected together by sliding dolly 28 the device is inoperative. To switch on the device the dolly 28 is moved to connect poles B and C. In that condition the whole element is energised and half wave rectified current is supplied to the motor. If now the dolly is moved to connect poles C and D the whole mains supply is then applied across only a part of the element so that greater heat energy is generated. Moreover, because the tap 22 is fixed the potential applied to the motor is increased and the motor speed increases. It will be understood that the above described embodiment can be modified in many ways. For example the number of poles in the switch can be increased together with the number of tappings between the switch and the element so as to increase the number of heat settings and corresponding motor speeds above two. Claims
1. A circuit comprising a low voltage D.C.
motor connected through a half wave rectifier circuit across a part of a heater element, the element being intended for connection to an A.C.
supply.
2. A circuit as claimed in Claim 1, wherein means are provided for connecting the A.C.
supply across a part or the whole of the heater element whereby when the A.C. supply is connected across a part of the heater element the D.C. potential applied to the motor is increased.
3. A circuit as claimed in Claim 1 or Claim 2, wherein means are provided for connecting the A.C. supply across a plurality of different parts of the heating element.
4. A circuit substantially as described herein with reference to the accompanying drawing.
5. A fan heater including a circuit as claimed in al,y preceding claim wherein the motor is arranged to drive a fan and direct a stream of air across the heater element.
GB7846167A 1977-09-01 1978-11-27 Controlling Electric Fan Heaters Withdrawn GB2024542A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7846167A GB2024542A (en) 1977-09-01 1978-11-27 Controlling Electric Fan Heaters

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3645577 1977-09-01
GB7846167A GB2024542A (en) 1977-09-01 1978-11-27 Controlling Electric Fan Heaters

Publications (1)

Publication Number Publication Date
GB2024542A true GB2024542A (en) 1980-01-09

Family

ID=26263123

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7846167A Withdrawn GB2024542A (en) 1977-09-01 1978-11-27 Controlling Electric Fan Heaters

Country Status (1)

Country Link
GB (1) GB2024542A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2498038A1 (en) * 1981-01-15 1982-07-16 Braun Ag ELECTRICAL ASSEMBLY FOR OPERATION AT MULTIPLE STAGES OF HEATERS AND OF A FAN MOTOR, FOR EXAMPLE IN A HAIR DRYER

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2498038A1 (en) * 1981-01-15 1982-07-16 Braun Ag ELECTRICAL ASSEMBLY FOR OPERATION AT MULTIPLE STAGES OF HEATERS AND OF A FAN MOTOR, FOR EXAMPLE IN A HAIR DRYER

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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)