Electric circuit for portable heater

• US 20040084440A1
• Filed: 06/26/2003
• Published: 05/06/2004
• Est. Priority Date: 10/01/2001
• Status: Active Grant

• Current Assignee: Art K. Tateishi
• Original Assignee: Art K. Tateishi
• Inventors: Tateishi, Art K.
• Granted Patent: US 6,940,051 B2
• Time in Patent Office: Days
• US Class Current: 219/508
• CPC Class Codes: F24H 15/128 Preventing overheating
• CPC Class Codes: F24H 15/208 Temperature of the air after heating
• CPC Class Codes: F24H 15/281 Input from user
• CPC Class Codes: F24H 15/35 Control of the speed of fans
• CPC Class Codes: F24H 15/37 of electric heaters
• CPC Class Codes: F24H 15/395 Information to users, e.g. alarms
• CPC Class Codes: F24H 3/0417 portable or mobile
• CPC Class Codes: F24H 9/2071 using electrical energy supply

Abstract

A heater effectively uses a current controlled fan motor in series with a resistance heating arrangement. The fan motor preferably is wound with a gauge of wire to appropriate for the relatively high current provided to the fan motor. This arrangement is effectively used to adjust the fan speed to match the heat output when the heating arrangement has variable heat output. More desirable operating characteristics are achieved without increasing costs and fan motor manufacturing savings are realized. The portable heater preferably produces heat at different outputs and the current used to power the resistance heating arrangement is used to power the fan motor.

Claims

1. An electrical circuit for connection to a domestic voltage source for powering a low output current controlled motor while generating heat, said circuit comprising a resistor heater means connected in series with said motor, the value of said resistor heater means being such as to provide on connection of said circuit to said source, a current flow therethrough to produce a voltage drop thereacross just less than the source voltage, and said current controlled motor having coil windings of a low number of turns of wire of a wire size to accept the current flowing through the resistor heater means without heating whereby the voltage drop across the motor is less than about five volts.

2. A circuit as claimed in claim 1 in which said resistor heater means comprises at least two resistors and said circuit includes a switch to selectively connect said resistors in series with said motor in a manner to change the heating power of said resistor heater means and the current through said motor coils to change motor speed.

3. A circuit as claimed in claim 2 in which said wire size of said motor windings is of the order of 14 to 18 gage wire.

4. A circuit as claimed in claims 1, 2 or 3 in which the number of turns of said motor windings is approximately twenty-eight turns.

5. A circuit as claimed in claims 1, 2 or 3 in which said motor is a shaded 2 pole induction motor in which the number of turns of said coil windings comprise approximately 14 turns per pole.

6. A circuit as claimed in claim 1 in which the number of turns of said coil windings is of the order of 28 and said wire size of said windings is of the order of 14 to 18 gage wire.

7. A circuit as claimed in claim 6 in which said motor is a shaded 4 pole induction motor having approximately 7 turns of wire per pole.

8. A circuit as claimed in claims 1, 6 or 7 said resistor heater means comprises a first resistor and a second resistor connected in parallel through a first thermostat connected to interrupt current flow through said first resistor and a second thermostat in series with said first thermostat for interrupting current flow through said second resistor, said second thermostat being selected to interrupt current flow to said second resistor at a slightly lower temperature than the temperature at which said first thermostat interrupts current flow to said first resistor to provide an automatic heat control and motor speed change system.

9. A low powered current controlled motor for driving a fan in a circuit for connection to a domestic voltage source where the load is a resistor heater means having a value to provide on connection of the circuit to the source a voltage drop thereacross just less than the voltage of the source, said motor having coil windings for connection in series with the resistor heater means and the source whereby current flowing through the heater means flows through said motor coil windings, said coil windings having a low number of turns and being a wire size to accept heater current without heating.

10. A motor as claimed in claim 9 in which said wire size is of the order of 14 to 18 gage wire.

11. A motor as claimed in claims 9 or 10 in which the number of turns of said coil windings is approximately 28.

12. A motor as claimed in claims 9 or 10 in which said motor is a shaded 2 pole induction motor in which the number of turns of said motor windings comprises approximately 14 turns per pole.