Starting device for single-phase induction motor
AssigneePanasonic Corporation
InventorsMikio Sahashi, Akihiko Matsuya, Shinichi Iwasaki, Motoi Okada, Kazuo Itoh
Life of this patent
Estimating the term…
Abstract
When a starting current flows in an auxiliary winding S, a main PTC 12 and an auxiliary PTC 14 generate heat by themselves and the electrical resistance value increases. When the auxiliary PTC 14 reaches 140 deg. C., the snap action bimetal 18 is turned off, and no current flows into the main PTC 12, and starting of the single-phase induction motor 70 is complete. When the snap action bimetal 18 is cut off, slight current continues to flow only into the auxiliary PTC 14 side, and by the slight generated heat, the snap action bimetal 18 is kept in OFF state.
Claims26
A starter of single-phase induction motor having main winding and auxiliary winding energized by alternating current power source, comprising:
- a casing,
- a positive characteristic thermistor connected in series to the auxiliary winding,
- an auxiliary positive characteristic thermistor connected parallel to the positive characteristic thermistor,
- a snap action bimetal connected in series to a series circuit of auxiliary winding and positive characteristic thermistor for sensing the heat from the auxiliary positive characteristic thermistor and turning off when reaching a set temperature, and
- an enclosed compartment accommodated in the casing, for enclosing the snap action bimetal and auxiliary positive characteristic thermistor.
A starter of single-phase induction motor having main winding and auxiliary winding energized by alternating-current power source, comprising:
- a casing,
- a positive characteristic thermistor connected in series to the auxiliary winding,
- an auxiliary positive characteristic thermistor connected parallel to the positive characteristic thermistor,
- a bimetal connected in series to a series circuit of auxiliary winding and positive characteristic thermistor for sensing the heat from the auxiliary positive characteristic thermistor and turning off when reaching a set temperature,
- an enclosed compartment accommodated in the casing, for enclosing the bimetal and auxiliary positive characteristic thermistor, and
- a magnet for applying magnetic force to the bimetal so as to force the contact point to the ON side.
A starter of single-phase induction motor having main winding and auxiliary winding energized by alternating-current power source, comprising:
- a casing,
- a positive characteristic thermistor connected in series to the auxiliary winding,
- an auxiliary positive characteristic thermistor connected parallel to the positive characteristic thermistor,
- a temperature sensing magnet for sensing the heat from the auxiliary positive characteristic thermistor and demagnetizing when reaching a set temperature,
- a switch connected in series to a series circuit of auxiliary winding and positive characteristic thermistor, and turning on as being attracted by the magnetic force of the temperature sensing magnet, and turning off by demagnetization of the temperature sensing magnet, and
- an enclosed compartment accommodated in the casing, for enclosing the switch.
A starter of single-phase induction motor having main winding and auxiliary winding energized by alternating-current power source, comprising:
- a positive characteristic thermistor connected in series to the auxiliary winding,
- an auxiliary positive characteristic thermistor connected parallel to the positive characteristic thermistor,
- a temperature sensing magnet for sensing the heat from the auxiliary positive characteristic thermistor and demagnetizing when reaching a set temperature, and
- a reed switch connected in series to a series circuit of auxiliary winding and positive characteristic thermistor, and turning on as being attracted by the magnetic force of the temperature sensing magnet, and turning off by demagnetization of the temperature sensing magnet.
A starter of single-phase induction motor having main winding and auxiliary winding, comprising a positive characteristic thermistor connected in series to the auxiliary winding, and a socket terminal for connecting electrically with a detachable connection pin,
- wherein the socket terminal has a pair of plates extending sideways in the axial direction of connection pin bent to the inner side, has the leading end formed in an arc shape so as to conform to the columnar shape of the connection pin, and is provided with a connection pin holder having the leading ends spaced from each other, and
- the connection pin holder is divided into two sections by the slit in the connection pin axial direction and vertical direction, into leading end side first position, and inner side second position.
A starter of single-phase induction motor having main winding and auxiliary winding energized by alternating-current power source, comprising:
- a casing,
- a positive characteristic thermistor connected in series to the auxiliary winding,
- an auxiliary positive characteristic thermistor connected parallel to the positive characteristic thermistor,
- a slow action bimetal connected in series to a series circuit of auxiliary winding and positive characteristic thermistor for sensing the heat from the auxiliary positive characteristic thermistor and turning off when reaching a set temperature, and
- an enclosed compartment accommodated in the casing, for enclosing the slow action bimetal and auxiliary positive characteristic thermistor.
A starter of single-phase induction motor having main winding and auxiliary winding energized by alternating-current power source, comprising:
- a positive characteristic thermistor connected in series to the auxiliary winding,
- an auxiliary positive characteristic thermistor connected parallel to the positive characteristic thermistor,
- a slow action bimetal connected in series to a series circuit of auxiliary winding and positive characteristic thermistor for sensing the heat from the auxiliary positive characteristic thermistor and turning off when reaching a set temperature, and
- a snap action bimetal connected in series to a series circuit of auxiliary winding, positive characteristic thermistor, and slow action bimetal for sensing the heat from the positive characteristic thermistor and turning off when reaching a specified high temperature.
Dependencies are inferred from the claim text.