Abstract: This disclosure relates to an electric motor of a motor-pump assembly, the motor including an improved end bell. The end bell is located between the motor and the pump of the assembly and forms a common wall between them. The end bell is made of a material having a relatively high coefficient of thermal conductivity, and a cover made of a material having a relatively low coefficient of thermal conductivity separates the pumped liquid from the end bell. A bearing is supported by the end bell, and condensation around the bearing is prevented by the cover and by means for circulating relatively warm air around the bearing.

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 relates to control apparatus and particularly to a triggered switch connected in a first or controlled circuit and a trigger device connected in a second circuit. AC currents flow through the first and second circuits and there is a changing phase angle between the currents. Further, the current level in the second circuit changes. When the phase angle is greater than a certain value and the current level in the second circuit is above a certain level, the trigger device triggers the switch and energizes the first circuit. At angles below the value and current levels below the certain level, the switch is not triggered. Thus, the changing phase angle may be utilized to control the first circuit. The triggered switch is a thyristor type of device such as a triac, and the trigger device is preferably a reed switch. The control apparatus is particularly useful in controlling the start winding of a single phase AC motor.

Abstract: This disclosure deals with single phase AC electric motors. The motor includes run and start windings, a start winding cutout switch connected in series with the start winding, and an electrical connector. Different power supply arrangements are provided which couple with the connector. One arrangement includes a power supply cable which supplies power and a jumper attachment which connects the start and run windings in parallel, thus causing the motor to operate as a split phase motor. In another arrangement, a cable supplies power and a capacitor attachment is provided for connecting the start winding to a start capacitor, thus causing the motor to operate as a capacitor start motor. The motor may be constructed to receive the attachments at either end of the motor.

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.

Abstract: This disclosure relates to a centrifugal mechanism and switch construction particularly for use in an electric motor. The mechanism includes a support part that is secured to and rotates with the motor shaft, and a weight that is carried by the support part. The weight has its center of gravity to one side of the motor axis, and the weight is pivotally attached to the support part. Centrifugal force tends to swing the weight in one direction and springs connected between the support part and the weight tend to counter the centrifugal force. A lightweight disc is pivotally connected to the moving end of the weight, the disc being located to activate the switch. The weight and a hinge member form a parallel arm connection between the disc and the support part.

Abstract: This disclosure relates to apparatus and method for controlling and protecting an electric motor. A transmitter is coupled to the motor and to the power lines for generating pulses on the power lines in certain circumstances such as during an overheated motor condition. A control unit is coupled to the power lines and senses the pulses and monitors the power current magnitude in the lines. The unit compares the current level with previously established upper and lower limits. If the current level is outside the limits for a preset length of time, a fault condition exists and the motor is turned off for a length of time that depends upon the severity of the fault. The unit also turns off the motor upon the receipt of pulses from the transmitter when a certain number of pulses regularly recur. The unit includes indicators for displaying the nature of the fault.