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US 4,388,581 AGranted
Dynamoelectric machine
AssigneeGeneral Electric Company
InventorHar S. Bhatnagar
Life of this patent
Estimating the term…
Abstract
A dynamoelectric machine has only a pair of line terminals adapted for selective connection across a single phase power source and is operable to be started in a split-phase mode, to run at a predetermined low speed in a single phase mode, and to run at a predetermined high speed generally in a two phase mode.
Claims13
A dynamoelectric machine adapted for energization at a predetermined low speed in a single phase mode and for energization at a predetermined high speed generally in a two phase mode across a single phase power source in response to selective manual operation of a line switch adapted for connection in circuit relation between the dynamoelectric machine and the power source, the dynamoelectric machine comprising:
- a housing including a pair of opposite end plates;
- a terminal board supported on said housing at least generally adjacent one of said end plates and including a pair of terminal means adapted for respective connection with the power source;
- a ferromagnetic stator arranged with said housing between said end plates and spaced from said terminal board, said stator including a bore, and a plurality of winding receiving slots;
- a winding circuit disposed in at least some of said slots of said stator and including auxiliary winding means having a first winding section and a second winding section with one side of each of said first and second sections connected together in series circuit relation, a low speed main winding means, a high speed main winding means, the other side of said first winding section and one side of each of said low speed main winding means and said high speed main winding means being connected with one of said terminal means, the other side of each of said high speed main winding means and said second winding section being connected with each other at a circuit junction, and a capacitor connected between said circuit junction and the other side of said second winding section wherein said high speed run winding means, said first and second sections of said auxiliary winding means and said capacitor defines a permanently interconnected parallel winding circuit combination;
- a rotatable shaft extending through said bore of said stator and rotatably journaled in said opposite end plates;
- a rotor on said shaft conjointly rotatable therewith and disposed at least in part within said bore of said stator so as to be arranged in magnetic coupling relation therewith upon the energization of the dynamoelectric machine;
- a relay disposed at least in part within said housing and including first and second contacts, said first contact being connected with said parallel winding circuit combination at said circuit junction, coil means connected between said second contact and said one terminal means of said terminal board and adapted for excitation upon the energization of the dynamoelectric machine across the power source, a first switch member urged toward making engagement with said first contact and associated in magnetic coupling relation with said coil means, said first switch member being movable to break from said first contact and make with said second contact upon the excitation of said coil means;
- a centrifugal switch actuating mechanism supported on at least one of said rotor and said shaft so as to be conjointly rotatable therewith and having a push collar disposed about said shaft, said centrifugal switch actuating mechanism being operable generally in response to rotation of said rotor upon the enegization of the dynamoelectric machine to move said push collar between an at-rest position and an axially displaced position thereof with respect to said shaft;
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- switch means for at least in part controlling said winding circuit and supported on said terminal board, said switch means including third, fourth, and fifth contacts, said third contact being connected with said circuit junction, said fourth contact being connected with said first and second winding sections of said auxiliary winding means between the one sides thereof, respectively, said fifth contact being connected with the other side of said low speed main winding means, a second switch member arranged generally in driven relation with said push collar of said centrifugal switch actuating mechanism and urged toward making engagement with both of said third and fourth contacts when said push collar is in its at-rest position, and said second switch member being connected in circuit relation with said second contact of said relay, said first switch member being magnetically attracted from said first contact into making engagement with said second contact in response to the excitation of said coil means of said relay when the line switch is manually operated to initially effect starting excitation of only said high speed main winding means and said second winding section of said auxiliary winding means in said parallel winding circuit combination when said push collar is in its at-rest position with said second switch member in making engagement with both of said third and fourth contacts so as to effect split-phase starting energization of the dynamoelectric machine, said push collar being movable from its at-rest position to its axially displaced position in response to the operation of said centrifugal switch operating mechanism generally as said rotor attains the preselected low speed in response to the split-phase starting energization of the dynamoelectric machine with the movement of said push collar driving said second switch member from both said third and fourth contacts terminating the split-phase starting energization of the dynamoelectric machine and into making engagement with said fifth contact exciting said low speed main winding means so as to effect the single phase energization at the predetermined low speed of the dynamoelectric machine across the power source, said first switch member thereafter returning from said second contact to remake with said first contact in response to the deexcitation of said coil means of said relay in the event of the manual operation of the line switch to effect a preselected momentary deenergization of the dynamoelectric machine across the power source reducing the rotational speed of said rotor and said centrifugal switch operating mechanism below the predetermined low speed so as to effect return movement of said push collar from its displaced position toward its at-rest position and the disengagement of said second switch member from said fifth contact to deexcite said low speed main winding means, and said parallel winding circuit combination being subsequently excited when the line switch is again manually operated to reconnect the dynamoelectric machine across the power source and effect the reenergization of the dynamoelectric machine generally in the two phase mode thereof at the predetermined high speed.
7 more elements
A dynamoelectric machine adapted for selective energization at a predetermined low speed and at a predetermined high speed across a single phase power source, the dynamoelectric machine comprising:
- a winding circuit including a low speed main winding means for excitation to effect the energization of the dynamoelectric machine at the predetermined low speed thereof, and a parallel winding circuit combination of a high speed main winding means and auxiliary winding means for conjoint excitation to effect both a starting energization of the dynamoelectric machine and the energization thereof at the predetermined high speed;
- a pair of switch means for translation, between a pair of switching modes thereof, respectively, to control said winding circuit and with one of said switch means being translated in response to dynamoelectric machine speed, said switch means pair in one of the respective switching modes thereof effecting the excitation of said high speed winding means and a part of said auxiliary winding means in said parallel winding circuit combination upon initial starting energization of the dynamoelectric machine across the power source and said one switch means being translated from its one switching mode effecting the deexcitation of said parallel winding circuit combination into the other of its switching modes to effect the excitation of said low speed main winding means and the energization of the dynamoelectric machine at the predetermined low speed thereof generally as the predetermined low speed is attained in response to the initial starting energization of the dynamoelectric machine, said one switch means also being translated from its other switching mode effecting the deexcitation of said low speed main winding means upon the occurrence of a preselected momentary deenergization of the dynamoelectric machine across the power source reducing the speed of the dynamoelectric machine below the predetermined low speed, and said other switch means also being translated from its one switching mode into the other of its switching modes upon the occurrence of the preselected momentary deenergization of the dynamoelectric machine across the power source thereby to effect the excitation of said parallel winding circuit combination and the energization of the dynamoelectric machine at the predetermined high speed thereof when the dynamoelectric machine is reenergized across the power source subsequent to the preselected momentary interruption of the dynamoelectric machine energization.
A dynamoelectric machine adapted for selective energization at a predetermined low speed and at a predetermined high speed across a single phase power source, the dynamoelectric machine comprising:
- centrifugal switch means operable generally in response to dynamoelectric machine speed for switching from a first position to a second position when the dynamoelectric machine is energized at least to the predetermined low speed thereof across the power source;
- relay means for operation between an excited condition effected when said centrifugal switch means is in its first position and a deexcited condition when said centrifugal switch is in its second position;
- a parallel winding circuit combination including a high speed main winding means permanently connected across a series combination of an auxiliary winding means and a phase shift capacitor with only said high speed main winding means and a part of said auxiliary winding means being initially excited to effect start-up energization of the dynamoelectric machine when said centrifugal switch means is in its first position and said relay means is in its excited condition until the dynamoelectric machine generally attains the predetermined low speed thereof;
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- low speed main winding means adapted for excitation to maintain the predetermined low speed energization of the dynamoelectric machine when said centrifugal switch is in its second position and said relay means is in its deexcited condition, and said parallel winding circuit combination being thereafter further reexcited to effect the energization of the dynamoelectric machine at the predetermined high speed thereof when said relay means is translated to its deexcited condition in response to a preselected momentary deenergization of the dynamoelectric machine across the power source.
2 more elements
A dynamoelectric machine adapted for energization at a predetermined low speed and at a predetermined high speed across a single phase power source, the dynamoelectric machine comprising:
- a low speed main winding means;
- a parallel winding circuit combination including a high speed main winding means connected across a series combination of a phase shift capacitor and a pair of series connected auxiliary winding sections;
- switch means responsive to dynamoelectric machine speed and movable between one position for short circuiting said capacitor and one of said auxiliary winding sections so that upon start-up energization of the dynamoelectric machine only said high speed main winding means and the other of said auxiliary winding sections are excited in parallel and another position of said switch means to terminate the start-up energization of the dynamoelectric machine generally as the dynamoelectric machine attains the predetermined low speed thereof and to effect the excitation of said low speed main winding means so as to maintain the predetermined low speed energization of the dynamoelectric machine;
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- relay means for operation between a pair of switching modes, said relay being disposed in one of its switching modes when said switch means is in its one and another positions and said relay means being operable in response to a preselected condition to the other of its switching modes to effect the termination of the predetermined low speed energization of the dynamoelectric machine and the excitation of said parallel winding circuit combination so as to energize the dynamoelectric machine at the predetermined high speed thereof.
2 more elements
A dynamoelectric machine adapted for energization at a predetermined low speed and a predetermined high speed across a single phase power source, the dynamoelectric machine comprising:
- a pair of main windings;
- a series combination of a phase-shift capacitor and a pair of auxiliary windings connected in a parallel combination with one of said main windings;
- means operable generally for short circuiting one of said auxiliary windings and said phase-shift capacitor at a speed of the dynamoelectric machine below the predetermined low speed so that only the other of said auxiliary windings is excited with said one main winding in said parallel combination to effect a split phase starting mode of the dynamoelectric machine;
- means operable generally as the dynamoelectric machine attains its predetermined low speed for effecting the excitation of the other of said main windings and for effecting the deexcitation of said one main winding and said other auxiliary winding so that said other main winding effects the energization of the dynamoelectric machine at the predetermined low speed thereof in a single phase mode;
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- means operable generally at a speed of the dynamoelectric machine less than the predetermined low and speed occasioned in the event of a preselected momentary interruption in the energization of the dynamoelectric machine across the power source for effecting the deexcitation of said other main winding and for effecting the excitation of said parallel combination so as to energize the dynamoelectric machine in a two phase mode to the predetermined high speed thereof.
3 more elements
A dynamoelectric machine adapted for selective energization at a predetermined low speed and at a predetermined high speed across a power source, the dynamoelectric machine comprising:
- a low speed running winding and a high speed running winding;
- centrifugal switch means operable generally for switching between a first position and a second position;
- relay means adapted for operation in an energized condition and a deenergized condition;
- a first auxiliary winding operative when energized in parallel with one of said low and high speed running windings to accelerate the dynamoelectric machine to at least the predetermined low speed thereof;
- a second auxiliary winding;
- means for connecting said first and second auxiliary windings in a series combination with each other and in a parallel combination with said high speed running winding, said parallel combination being effective when energized to accelerate the dynamoelectric machine from its predetermined low speed to its predetermined high speed;
- means for placing said relay means in its energized condition when the dynamoelectric machine is initially started across the power source;
- means associated with said relay means for maintaining said relay means in its energized condition after being placed therein upon the initial starting of the dynamoelectric machine across the power source when said centrifugal switch is in its first position, said centrifugal switch being operative in its second position to energize said low speed running winding;
- means for disabling said placing means when said centrifugal switch is in its second position;
- means operable generally in the event of the occurrence of a preselected momentary interruption of the energization of the dynamoelectric machine across the power source when said centrifugal switch is in its second position for effecting the deenergization of said relay means, said relay means being effective in its deenergized condition to deenergize said low speed running winding and to energize said parallel combination whereby the dynamoelectric machine is energized to its predetermined high speed.
7 more elements
Dependencies are inferred from the claim text.