Solid-state motor control circuit using triac elements

Claim 2

The combination comprising, a. a motor; b. electrical power means coupled to said motor; c. first and third semiconductor means further coupled to said motor and to said power means; d. means for simultaneously gating on said first and third semiconductor means; to enable said power means to rotate said motor in a first direction; e. second semiconductor means further coupled to said motor and to said power means; f. means for simultaneously gating on said first and second semiconductor means to enable said power means to rotate said motor in a second direction; g. fourth semiconductor means further coupled to said motor and to said power means; h. storage means coupled to said power source, motor and fourth semiconductor device; i. means for simultaneously gating on said third and fourth semiconductor means to enable a charge stored in said storage means to brake said motor.

Claim 3

The combination in accordance with claim 1 wherein said motor comprises a single-phased type.

Claim 4

The combination in accordance with claim 2 wherein said motor comprises a split-phase motor.

Claim 5

The combination in accordance with claim 1 wherein said first and third semiconductor means comprises respective first and third triac devices connected in series and further connected in series with the motor windings whereby the current flowing in said triacs and the motor windings causes the motor shaft to rotate in said first direction.

Claim 6

The combination in accordance with claim 1 wherein said second semiconductor device comprises a respective second triac device connected in series with the motor windings whereby the current flowing in said first and second triacs and the motor windings causes said motor shaft to rotate in said second direction.

Claim 7

The combination in accordance with claim 1 wherein said fourth semiconductor means comprises a respective fourth triac device connected in series relationship with at least one of the motor windings and said third triac device for conducting said stored charge through said one winding to cause the motor to stop rotating.

Claim 8

The combination comprising: a. a motor having first and second windings and a capacitor connected across said windings, b. first and second semiconductor devices connected in series relationship, one terminal of said first semiconductor device comprising said series connection being connected to one of said motor winding, and one terminal of said second semiconductor device comprising said series connection, being connected to ground potential, the gate electrode of said first semiconductor being coupled to one end of said second motor winding, the gate electrode of said second semiconductor being connected to a control signal, c. a third switching semiconductor device, one terminal being connected to said second motor winding and its second terminal being connected to ground, the gate electrode being connected to a second control signal, d. an AC power source, one side of which is at ground potential, e. a capacitor, one terminal thereof being coupled to the ungrounded side of said power source, f. a fourth semiconductor device, one terminal thereof being connected to the other side of said capacitor, and the second terminal being connected to the series connection between said first and second semiconductor, the gate terminal of said fourth semiconductor coupled to the grounded side of said power source, g. a diode connected across Said terminals of said fourth semiconductor, whereby control signals applied to the gate terminals of said first and third semiconductor device causes said motor to rotate in a first direction, and a control signal applied only to the gate terminal of said first semiconductor device causes said motor to rotate in a second direction, and the removal of a control signal from the gate terminals of said first and third semiconductor devices causes the charge on said capacitor to discharge through said motor to cause the latter to come to a stop.

Claim 9

The combination comprising: a. a motor having first and second windings and a capacitor connected across said windings, b. first and second semiconductor devices connected in series relationship, one terminal of said first semiconductor device comprising said series connection being connected to one of said motor winding, and one terminal of said second semiconductor device comprising said series connection, being connected to ground potential, the gate electrode of said first semiconductor being coupled to one end of said second motor winding, the gate electrode of said second semiconductor being connected to a control signal, c. a third switching semiconductor device, one terminal being connected to said second motor winding and its second terminal being connected to ground, the gate electrode being connected to a second control signal, d. an AC power source, one side of which is at ground potential, e. a capacitor, one terminal thereof being coupled to the ungrounded side of said power source, f. a fourth semiconductor device, one terminal thereof being connected to the other side of said capacitor, and the second terminal being connected to the series connection between said first and second semiconductor, the gate terminal of said fourth semiconductor coupled to the grounded side of said power source, g. a diode connected across Said terminals of said fourth semiconductor, whereby control signals applied to the gate terminals of said first and third semiconductor device causes said motor to rotate in a first direction, and a control signal applied only to the gate terminal of said first semiconductor device causes said motor to rotate in a second direction, and the removal of a control signal from the gate terminals of said first and third semiconductor devices causes the charge on said capacitor to discharge through said motor to cause the latter to come to a stop.

Claim 10

The combination in accordance with claim 6 wherein said motor is single-phased.

Claim 11

The combination in accordance with claim 7 wherein said motor is a split-phase type.