FAQ's

Can I get just the motor for a blower assembly?  Yes you can. Most suppliers sell & stock both the complete blower or just the motor for the unit. The nameplate information from the motor, as well as the manufacturer of the motor, the make of the blower unit, with model numbers of both the motor & blower will help determine which is the proper motor or complete blower assembly to use.

How do I replace a motor?  First you need to know the manufacturer, horsepower, volts, RPM, amps and frame & enclosure off the name plate of the motor. It is also helpful to know for what application the motor is utilized.

Do you sell other products for spa's?  We can replace heater elements, high limits, unions, o-rings & much more. Additionally, we supply other parts for spa's should the problem exist outside of the motor or pump.

What's the difference between a vertical & tethered sump pump?  It's all about the float switches. A vertical float switch moves up & down a rod and is meant for tighter spots in a pit. A tethered float switch floats freely and is meant for a wider pit. Seymour-Smith sells & stocks Berkeley Submersible pumps in 115V 1/3HP Vertical or 1/2 -1/3HP Tethered.

How much are pool pump motors?  Price is determined by a number of factors which can be found on the motor name plate information. In order to replace your motor, we need the following information: manufacturer, horsepower, volts, RPM, frame, amps, service factor & whether the motor is single speed or two-speed.



Common Terms

Actuator: A device that creates mechanical motion by converting various forms of energy to rotating or linear mechanical energy.

Air-Over (AO): Motors for fan or blower service that are cooled by the air stream from the fan or blower. Motor is located in the air stream to cool the motor.

Alternating Current (AC): The standard power supply available from local electric utility companies.

Ambient Temperature (AMB): The temperature of the space (air) around the motor. Most motors are designed to operate in an ambient not to exceed 40C (104F).

Ampere (Amp): The standard unit of electric current. The current produced by a pressure of one volt in a circuit having a resistance of one ohm.

Armature: The rotating part of a brush type direct current (DC) motor. In an induction motor, the rotating part is called a rotor.

Bearings: A bearing is a mechanical assembly that allows for a rotational load (shaft, rod, etc.) to be supported on a fixed non-moving surface.

    Sleeve: Common in home appliance motors. Normally used in blower applications where low noise levels are important.

    Ball: Used when high shaft load (radial or axial thrust load) capacity is required. Ball bearings are usually used in industrial and agricultural motors.

Blower: A blower is an assembly of a motor and an impeller mounted in a ducted enclosure that causes the air to flow at a higher velocity than that of a typical fan that uses a propeller. Blowers are typically found in furnaces and other HVAC related equipment.

Brush: Current conducting material in a DC motor, usually graphite, or a combination of graphite and other materials. The brush rides on the commutator of a motor and forms an electrical connection between the armature and the power source.

Capacitance: As the measure of electrical storage potential of a capacitor, the unit of capacitance is the farad, but typical values are expressed in microfarads (MFD).

Capacitor: A device that stores electrical energy. Used on single phase motors.

Commutator: The part of a DC motor armature that causes the electrical current to be switched to various armature windings. Properly sequenced switching creates the motor torque. The commutator also provides the means to transmit the electrical current to the moving armature through the brushes that ride on the commutator.

Coupling: A motor coupling is a mechanical device that allows the motor shaft to be connected to the load thereby allowing the motion of the motor to be applied.

DC Current: The power supply available from batteries, generators (not alternators), or a rectified source used for special purpose applications.

Duty Cycle: The relationship between operating time and the resting time of an electric motor.

    Continuous Duty: The operation of loads for over one hour.

    Intermittent Duty: The operation during alternate periods of load and rest. Usually expressed as 5 minutes, 30 minutes or one hour.

Efficiency: The ration of the useful work performed and the energy expended in producing it.

Enclosure: Term used to describe the motor housing.   

    ODP: Open Drip Proof, housing has openings in end shields and shell to allow air to cool the motor. Normally used in "clean" applications.

    TEFC: Totally Enclosed Fan Cooled, housing has no openings. Motor is cooled by an external fan on the non-drive end of the motor shaft. Used in dirty/damp applications.

    TENV: Totally Enclosed Non-Ventilated. Not equipped with an external cooling fan, depends on convection air for cooling.

    TEAO: Totally Enclosed Air Over. Air flow from the driven or external device provides cooling air flow of the motor.
 

Fan: A fan is an electromechanical assembly that contains a propeller coupled to a motor shaft. Once the motor begins to spin it rotates the blades of the propeller which intern induces the static air to move causing air flow.

Field: The stationary part of a DC motor, commonly consisting of permanent magnets. Sometimes used also to describe the stator of an AC motor.

Frame: Standardized motor mounting and shaft dimensions as established by NEMA or IEC.

Frequency: An expression of how often a complete cycle occurs. Cycles per second describe how many complete cycles occur in a given time increment. Hertz (hz) has been adopted to describe cycles per second so that time as well as number of cycles is specified. The standard power supply in North America is 60hz. Most of the rest of the world has 50hz power.

Full Load Amperes (FLA): Line current (amperage) drawn by a motor when operating at rated load and voltage on motor nameplate. Important for proper wire size selection, and motor starter or drive selection. Also called full load current.

Full Load Torque: The torque a motor produces at its rated horsepower and full-load speed.

Fuse: A piece of metal, connected in the circuit to be protected, that melts and interrupts the circuit when excess current flows.

Hertz: Frequency, in cycles per second, of AC power. Named after H.R. Hertz, the German scientist who discovered electrical oscillations.

Horsepower (HP): A measure of the rate of work. 33,000 pounds lifted one foot in one minute, or 550 pounds lifted one foot in one second. Exactly 746 watts of electrical power equals one horsepower.

International Electrotechnical Commission (IEC): The worldwide organization that promotes international unification of standards or norms. Its formal decisions on technical matters express, as nearly as possible, an international consensus.

Impedance: The total opposition in an electric circuit to the flow of an alternating current. Expressed in ohms.

Impeller: An impeller is the portion of the pump that couples the motor to the pump so that the motion of the motor can directly move the liquid in the pump housing.

Induction Motor: The simplest and most rugged electric motor, it consists of a wound stator and a rotor assembly. The AC induction motor is named because the electric current flowing in its secondary member (the rotor) is induced by the alternating current flowing in its primary member (stator). the power supply is connected only to the stator. The combined electromagnetic effects of the two currents produce the force to create rotation.

Insulation: In motors, classified by maximum allowable operating temperature. NEMA Classifications include: Class A=105C, Class B=130C, Class F=155C and Class H=180C.

Kilowatt: A unit of power equal to 1000 watts and approximately equal to 1.34 horsepower.

Load: The work required of a motor to drive attached equipment. Expressed in horsepower or torque at a certain motor speed.

Mounting, Basic Types: The most common motor mounts include: rigid base, resilient base C face or D flange, and extended through bolts.

NEMA (National Electrical Manufactures Association): A non-profit trade organization, supported by manufacturers of electrical apparatus and supplies in the United States. Its standards alleviate misunderstandings and help buyers select the proper products. NEMA standards for motors cover frame sizes and dimensions, horsepower ratings, service factors, temperature rises and performance characteristics.

Open Circuit: A break in an electrical circuit that prevents normal current flow.

Phase: The number of individual voltages applied to an AC motor. A single-phase motor has one voltage in the shape of a sine wave applied to it. A three-phase motor has three individual voltages applied to it. The three phases are at 120 degrees with respect to each other so that peaks of voltage occur at even time intervals to balance the power received and delivered by the motor throughout its 360 degrees of rotation.

Poles: Magnetic devices set up inside the motor by the placement and connection of the windings. Divide the number of poles into 7200 to determine the motor's normal speed. For example, 7200 divided by 2 poles equals 3600RPM.

Relay: A device have two separate circuits, it is constructed so that a small current in one of the circuits controls a large current in the other circuit. A motor starting relay opens or closes the starting circuit under predetermined electrical conditions in the main circuit (run winding).

Rotation: The direction in which a shaft turns is either clockwise (CW) or counterclockwise (CCW). When specifying rotation, also state if viewed from the shaft end or the opposite shaft end of the motor.

Rotor: The rotating component of an induction AC motor. It is typically constructed of a laminated, cylindrical iron core with slots of cast-aluminum conductors. Short-circuiting end rings complete the "squirrel cage," which rotates when the moving magnetic field induces current in the shorted conductors.

Service Factor: A measure of the overload capacity built into a motor. A 1.15 SF means the motor can deliver 15% more than the rated horsepower without injurious overheating. A 1.10 SF motor should not be loaded beyond its rated horsepower. Service factors will vary for different horsepower motors and for different speeds.

Short Circuit: A fault or defect in a winding causing part of the normal electrical circuit to be bypassed, frequently resulting in overheating of the winding and burnout.

Stator: The fixed part of an AC motor, consisting of copper windings within steel laminations.

Temperature Rise: The amount by which a motor, operating under rated conditions, is hotter than its surrounding ambient temperature.

Thermal Protector: A device, sensitive to current and heat, which protects the motor against overheating due to overload or failure to start. Basic types include automatic rest, manual reset and resistance temperature detectors.

Thermostat: A protector, which is temperature-sensing only, that is mounted on the stator winding. Two leads from the device must be connected to control circuit, which initiates corrective action. The customer must specify if the thermostats are to be normally closed or normally open.

Thermocouple: A pair of dissimilar conductors joined to produce a thermoelectric effect and used to accurately determine temperature. Thermocouples are used in laboratory testing of motors to determine the internal temperature of the motor winding.

Torque: The turning effort or force applied to a shaft, usually expressed in inch-pounds or inch-ounces for fractional and sub-fractional HP motors.

Transformer: Used to isolate line voltage from a circuit or to change voltage and current to lower or higher values. Constructed of primary and secondary windings around a common magnetic core.

Underwriters Laboratories (UL): Independent United States testing organization that sets safety standards for motors and other electrical equipment.

Variable Frequency Drive (VFD): Variable frequency drives are electronic signal generators that produce a variable alternating current, voltage and frequency output to power an ac motor thus providing speed and torque control.

Voltage: A unit of electromotive force that, when applied to conductors, will produce current in the conductors.

Watt: The amount of power required to maintain a current of 1 ampere at a pressure of one volt when the two are in phase with each other. One horsepower is equal to 746 watts.

Winding: Typically refers to the process of wrapping coils of copper wire around a core, usually of steel. In an AC induction motor, the primary winding is a stator consisting of wire coils inserted into slots within steel laminations. The secondary winding of an AC induction motor is usually not a winding at all, but rather a cast rotor assembly. In a permanent magnet DC motor, the winding is the rotating armature.

Powered By iFlex eCommerce
Seymour-Smith Electric © 2018