Starting device for a single phase induction motor
First Claim
1. Starting device for a single phase induction motor, of the type having a cage type rotor and a stator with at least one main winding and one starting winding connected in series with first and second terminals of an alternating current source comprising:
- a relay having at least one contact with a pair of terminals, one of the terminals of said contact being connected to the first terminal of the alternating current source and the other terminal connected to the starting winding;
a coil for actuating the relay;
an electronic timer circuit connected to the coil for actuating the relay to open the relay contact by supplying a current to the coil thereof to end the starting operation of the motor after a period of time has elapsed from the motor powering up, said electronic timer circuit comprising;
a current limiting circuit having a first terminal connected to the second terminal of the alternating current source and a second terminal;
a rectifier circuit with an input connected to the second terminal of the current limiting circuit and an output;
a timing capacitor having its terminals connected between the output of said rectifier circuit and the first terminal of the supply source; and
output terminals respectively connected to the terminals of the timing capacitor and which are in turn connected to the coil for actuating the relay.
1 Assignment
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Accused Products
Abstract
A starting device for a single phase induction motor, of the type having a cage type rotor and a stator having at least one main coil and one starting coil, which is connected in series with first and second terminals of an alternating current source. The starting device comprises a relay (RL) having at least one contact, with one of the terminals thereof being connected to the first terminal (1) of the alternating current source (F), while the other terminal of said contact is connected to the terminal of the starting coil (L2); and a coil (B) for actuating the relay; an electronic timer circuit (T), which is connected to the terminals of the coil (B) for actuating the relay (RL), in order to open the contact of the latter by supplying a current to the coil (B) thereof, thereby finishing the starting operation of the motor (M), after a period of time has elapsed from the motor (M) powering up. In case the motor includes a permanent capacitor (CP), said capacitor will be connected in series with a starting coil (L2) between the terminal of the latter and the first terminal ( 1) of the alternating current source.
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Citations
21 Claims
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1. Starting device for a single phase induction motor, of the type having a cage type rotor and a stator with at least one main winding and one starting winding connected in series with first and second terminals of an alternating current source comprising:
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a relay having at least one contact with a pair of terminals, one of the terminals of said contact being connected to the first terminal of the alternating current source and the other terminal connected to the starting winding; a coil for actuating the relay; an electronic timer circuit connected to the coil for actuating the relay to open the relay contact by supplying a current to the coil thereof to end the starting operation of the motor after a period of time has elapsed from the motor powering up, said electronic timer circuit comprising; a current limiting circuit having a first terminal connected to the second terminal of the alternating current source and a second terminal; a rectifier circuit with an input connected to the second terminal of the current limiting circuit and an output; a timing capacitor having its terminals connected between the output of said rectifier circuit and the first terminal of the supply source; and output terminals respectively connected to the terminals of the timing capacitor and which are in turn connected to the coil for actuating the relay. - View Dependent Claims (2, 5, 6, 7, 8, 11, 12, 13, 14, 15, 20, 21)
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3. Starting device for a single phase induction motor, of the type having a cage type rotor and a stator with at least one main winding and one starting winding connected in series with first and second terminals of an alternating current source comprising:
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a relay having at least one contact with a pair of terminals, one of the terminals of said contact being connected to the first terminal of the alternating current source and the other terminal connected to the starting winding; a coil for actuating the relay; an electronic timer circuit connected to the coil for actuating the relay to open the relay contact by supplying a current to the coil thereof to end the starting operation of the motor after a period of time has elapsed from the motor powering up, said electronic timer circuit comprising; a current limiting circuit having a first terminal connected to the second terminal of the alternating current source and a second terminal; a rectifier circuit having an input connected to the second terminal of the current limiting circuit and an output; a timing capacitor connected between the output of said rectifier circuit and the first terminal of the supply source; and a voltage trigger circuit having input terminals connected to the first and second terminals of said timing capacitor and output terminals connected to the coil for actuating the relay. - View Dependent Claims (4, 16, 17, 18, 19)
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9. Starting device for a single phase induction motor, of the type having a cage type rotor and a stator with at least one main winding and one starting winding connected in series with first and second terminals of an alternating current source comprising:
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a relay having at least one contact with a pair of terminals, one of the terminals of said contact being connected to the first terminal of the alternating current source and the other terminal connected to the starting winding; a coil for actuating the relay; an electronic timer circuit connected to the coil for actuating the relay to open the relay contact by supplying a current to the coil thereof to end the starting operation of the motor after a period of time has elapsed from the motor powering up, and an external impedance connected between the starting winding and the terminal of the normally closed contact of the relay. - View Dependent Claims (10)
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Specification