Abstract:
Techniques disclosed herein include systems and methods for assembly of electric motor starter connecting packages that enable increased automation and reduced assembly via top-down assembly of circuit components, thereby allowing robotic placement, connection, and securing of circuit components. The connecting package can include an electric motor starter, with optional overload protector, packaged as one unit. The motor starter can include an electrical circuit containing a triac, current transformer, Positive Temperature Coefficient (PTC) element, resistor, and a capacitor. A cover and base of the connecting package enclose and firmly secure connected circuit elements without needing a circuit board or filler material. The device design enables quick testing of the motor starter circuit and circuit elements after being enclosed by the housing.
Abstract:
An enclosed motor protector has a housing formed by a base (10) and a cover (12) received on the base and enclosing a recess (10a) formed in the base. A first terminal (14) extends through an opening in the housing and mounts a stationary contact (14c) within the recess. An elongated movable contact arm (18) is cantilever mounted at one end in the recess and mounts a second movable contact (18a) on a free end of the arm which is adapted to move into and out of engagement with the stationary contact. A heater (20) is mounted in the recess in heat transfer relation with a snap acting thermostatic disc (22) disposed adjacent to the movable contact arm so that upon reaching a preselected temperature the disc will snap from one dished configuration to an opposite dished configuration with its motion transferred to the movable contact arm to move the contacts out of engagement. The cover is formed with a first multiple wall barrier (122) in the form of a triangular body when seen in a lateral cross section closing a first terminal receiving opening and a second multiple wall barrier (124) closing a second terminal receiving opening to interrupt the travel of arcs and the inlet of explosive gas to the enclosure. These features also diminish air supply in the enclosure to thereby weaken any combustion.
Abstract:
A switch assembly usable in a food waste disposer is disclosed having several improvements over the prior art. The switch assembly positively retains an overload switch, making assembly of the switch into the disposer easier. The switch assembly includes terminals, which attach to the start and run windings of the disposer. The terminals are arranged in a uniform direction along a single side of the switch assembly. This arrangement allows a single, integrated connector of winding leads to be easily connected to the switch assembly, facilitating assembly and reducing the possibility of incorrectly wiring the disposer during construction.
Abstract:
A hermetic compressor is disclosed having an electric motor, a compressor unit, and an overload protector within a hermetically sealed housing. The overload protector includes a thermally activated switching device for selectively providing current to the electric motor, a heater element thermally coupled to the switching device, and a control circuit controlling the heater element. The overload protector allows the disconnection of power to the motor due to factors and conditions specified in the remotely located control circuit.
Abstract:
A combination motor starter and protector module is described. The base member, in one embodiment, forms a motor protector compartment and a motor starter compartment. The motor protector, in one form, is a bimetallic switch configured to be coupled between a power source and the motor windings. The switch includes a stationary contact and a movable contact. A bimetal element, responsive to current flow through the protector, controls movement of the movable contact. The starter, in one form, is a positive temperature coefficient resistor (PTCR) disk configured to be connected in series circuit with the motor start winding. The cover of the combination housing includes, in one form, an integral capacitor support arm and terminal openings for receiving blade terminals of a run capacitor. The terminal openings in the cover align with blade receiving receptacles coupled to the PTCR start circuit. The blade terminals of a run capacitor are inserted into the receptacle openings and into electrical engagement with the blade receiving receptacles. The capacitor is supported by the module cover, including the capacitor support arm.
Abstract:
A method of assembling an overload protector for use in a combination starter-protector device adapted to be associated in circuit relation with a dynamoelectic machine. To practice this method, a conductive member is extended through a slot in a sidewall of a casing, and a contact section of the conductive member is located within an open ended recess in the casing defined by the sidewall and a base wall while a terminal section of the conductive member is located on an extension wall extending laterally of the sidewall. The terminal section is secured against displacement to the extension wall. A support for a bimetal switch element is disposed in an assembly position within the open ended recess, and the bimetal switch element is biased into engagement in circuit relation with the contact section.An overload protector, a combination starter-protector device and a method of assembling a starter-protector device are also disclosed.
Abstract:
An improved electromagnetic relay having a wafer of material with positive temperature coefficient of resistivity (PTC) mounted inside the relay combines a sturdy construction with low manufacturing costs adapting the relay for use as a starting relay for electric motors of compressors. For this purpose, the magnetic members of the relay are incorporated in the electrical relay circuit and are provided with attachments for plug-on connections of the relay to circuit pins of motor-compressor units.
Abstract:
A method of making an electrical control having a relay device, a solid state starter device and an overload protector device predeterminately arranged therein and connected in circuit relation.
Abstract:
This disclosure deals with a time delay cut-out circuit for the start winding of an AC electric motor. The circuit includes an electronic switch which is connected in series with the start winding and which may be selectively closed to energize the start winding. Time delay means is provided which, in response to current flow therethrough, provides a timing period. An auxiliary coil is inductively coupled to the motor windings and supplies current to operate the time delay means. The time delay means operates the electronic switch to energize the start winding during the timing period. The components of the circuit, except for the coil, are mounted in a capsule which may be plugged into the motor from the exterior of the stator. The time delay means includes a self heating, heat responsive device, and the components are sized and arranged to optimize the heat generation and dissipation properties and thereby obtain the desired operating characteristics.
Abstract:
This disclosure deals with a time delay cut-out circuit for the start winding of an AC electric motor. The circuit includes an electronic switch which is connected in series with the start winding and which may be selectively closed to energize the start winding. Time delay means is provided which in response to current flow therethrough, provides a timing period. An auxiliary coil is wound on the motor stator and supplies current to operate the time delay means. The electronic switch is connected to respond to the time delay means which closes the electronic switch to energize the start winding during the timing period. The components of the circuit, except for the coil, are mounted in a capsule which may be plugged into the motor from the exterior of the stator. The time delay means includes a heat responsive device, and the components are sized and arranged in the capsule to optimize the heat generation and dissipation properties and thereby obtain the desired operating characteristics.