Electric circuit for portable heater
First Claim
1. An electrical circuit for connection to a conventional domestic 120 volt source having a current carrying capacity of 15 amperes for powering a current controlled induction motor while generating heat, said circuit comprising a resistor means whose value can be selected connected in series with said motor, the selected value of said resistor means being such as to provide on connection of said circuit to said source, a current flow through said resistor means to produce a voltage drop thereacross just less than the source voltage, said current controlled motor having coil windings of fewer than 50 and at least about 28 turns of wire of a wire size to accept a current of up to about 15 amperes without heating, whereby the current through said resistor means whose value has been selected determines motor speed.
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Accused Products
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.
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Citations
13 Claims
- 1. An electrical circuit for connection to a conventional domestic 120 volt source having a current carrying capacity of 15 amperes for powering a current controlled induction motor while generating heat, said circuit comprising a resistor means whose value can be selected connected in series with said motor, the selected value of said resistor means being such as to provide on connection of said circuit to said source, a current flow through said resistor means to produce a voltage drop thereacross just less than the source voltage, said current controlled motor having coil windings of fewer than 50 and at least about 28 turns of wire of a wire size to accept a current of up to about 15 amperes without heating, whereby the current through said resistor means whose value has been selected determines motor speed.
- 7. A current controlled induction motor for driving a fan in a heater circuit to be connected to a domestic voltage source where a resistor heater means forms an electrical load having a value to provide on connection of the circuit to the source a voltage drop across said load 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 fewer than 50 and at least about 28 turns and being a wire size of the order of 14 to 18 gauge to accept heater current of at least 12.5 amperes without heating.
- 9. A current controlled induction motor for series connection with a load which on connection to a domestic voltage source provides a voltage drop across the load just less than the voltage of the source, said motor having windings of fewer than 50 and at least about 28 turns, said windings being of 14 to 18 gauge wire having a current carrying capacity of at least 12.5 amperes without heating.
Specification