Abstract The invention relates to a starting device for a single phase asynchronous motor comprising an auxiliary winding. The device includes first and second glow discharge lamps with each lamp having a thermal switch and these lamps being in series with the auxiliary winding. The first lamp has a glow discharge current established by current flowing in the auxiliary winding. The first lamp switch has normally closed contacts and the second lamp switch has normally open contacts. A resistor in shunt with the second lamp causes ignition of the second lamp when crossed by a predetermined supply voltage. The second lamp switch is closeable after a time lag due to a glow discharge current of said second lamp. The first lamp switch is openable after a time lag when a maximum line current is established when said second line switch is closed. The resistor causing extinguishing of the second lamp when a minimum voltage drop thereacross is established by a minimum line current consisting only of said first lamp discharge current.
Inventors
👤 G Laursen
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-05 22:17
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A starting device for a single phase asynchronous motor comprising an auxiliary winding, first and second glow discharge lamps each having a thermal switch, said lamps being in series with said winding, saif first lamp having a glow discharge current established by current flowing in said auxiliary winding, said first lamp switch having normally closed contacts and said second lamp switch having normally open contacts, a resistor in shunt with said second lamp for causing ignition of said second lamp when crossed by a predetermined supply voltage, said second lamp switch being closeable after a time lag due to a glow discharge current of said second lamp, said first lamp switch being openable after a time lag when a maximum line current is established when said second line switch is closed, said resistor causing extinguishing of said second lamp when a minimum voltage drop thereacross is established by a minimum line current consisting only of said first lamp discharge current.
Claim 2
Dependent Claim
160 words
A starting device for a single phase asynchronous motor comprising an auxiliary winding, first and second glow discharge lamps each having a thermal switch, said lamps being in series with said winding, saif first lamp having a glow discharge current established by current flowing in said auxiliary winding, said first lamp switch having normally closed contacts and said second lamp switch having normally open contacts, a resistor in shunt with said second lamp for causing ignition of said second lamp when crossed by a predetermined supply voltage, said second lamp switch being closeable after a time lag due to a glow discharge current of said second lamp, said first lamp switch being openable after a time lag when a maximum line current is established when said second line switch is closed, said resistor causing extinguishing of said second lamp when a minimum voltage drop thereacross is established by a minimum line current consisting only of said first lamp discharge current.