BARBER COLEMAN MOTORS

Barber Coleman manufactures for use in heating, ventilating and air conditioning (HVAC) spaces. They manufacture a variety of which can be used in various different areas of the HVAC industry and for different domains of use, from the design of medium to large industrial needs to office buildings.

They have more than one hundred years of quality servicing and the manufacturing of top quality products. The Barber Coleman Company has managed to excel at producing systems for building , home and water industries covering the entire HVAC spectrum. Their products include:

• Control box
• Controls thermocouples
• Control valves
• Globe valves
• Diaphragm valves
• Pinch valves
• Needle valves
• Butterfly valves
• Ball valves
• Plug valves

They are popular for their wide range of products like Actuators, Controllers, Thermostats, Transmitters, Valves, Ignitors, Governors, Switches, Sensors and other devices for HVAC applications.

At a broad level, there are two different types of : AC and DC. Alternating current (AC) are a broad category of that include single/multiphase, universal, servo, induction, synchronous, and gear- types. An AC is an electric driven by an alternating current. It commonly consists of two basic parts; an outside stationary stator having coils supplied with alternating current to produce a rotating and an inside attached to the output shaft that is given a torque by the rotating . Where speed stability is important, some AC (such as some Papst ) have the stator on the inside and the on the outside to optimize inertia and cooling. The , generated by AC , is produced by an electromagnet powered by the same AC voltage as the coil. There are many advantages in the use of ac aside from the wide availability of AC power.

Although there are various types of AC from Barber Coleman in existence, there are two main types, depending on the type of used. The first type is the induction , which only runs slightly slower or faster than the supply frequency. The on the of this is created by an induced current. The second type is the synchronous , which does not rely on induction and as a result, can rotate exactly at the supply frequency or a sub-multiple of the supply frequency. The on the is either generated by current delivered through slip rings or by a permanent magnet. Other types of include eddy current , and also AC/DC mechanically-commutated machines in which speed is dependent on voltage and winding connection.

Various other types of AC include the following:

A typical two-phase AC servo- has a squirrel cage and a consisting of two windings:

• A constant-voltage (AC) main winding.
• A -voltage (AC) winding in quadrature (i.e., 90 degrees phase shifted) with the main winding so as to produce a rotating . Reversing phase makes the reverse.

An AC servo amplifier, a linear power amplifier, feeds the winding. The electrical resistance of the is made high intentionally so that the speed/torque curve is fairly linear. Two-phase servo are inherently high-speed, low-torque devices, heavily geared down to drive the load.

• Single-phase AC induction

Three-phase produce a rotating . However, when only single-phase power is available, the rotating must be produced using other means. Several methods are commonly used:

• Shaded-pole

A common single-phase is the shaded-pole and is used in devices requiring low starting torque, such as electric fans or the drain pump of washing machines and dishwashers or in other small household appliances. In this , small single-turn copper “shading coils” create the moving . Part of each pole is encircled by a copper coil or strap; the induced current in the strap opposes the change of flux through the coil. This causes a time lag in the flux passing through the shading coil, so that the maximum intensity moves across the pole face on each cycle. This produces a low level rotating which is large enough to turn both the and its attached load. As the picks up speed the torque builds up to its full level as the principal is rotating relative to the rotating .

A reversible shaded-pole was made by Barber-Colman several decades ago. It had a single coil and two principal poles, each split halfway to create two pairs of poles. Each of these four “half-poles” carried a coil, and the coils of diagonally-opposite half-poles were connected to a pair of terminals. One terminal of each pair was common, so only three terminals were needed in all.

An unusual, adjustable-speed, low-torque shaded-pole could be found in traffic-light and advertising-lighting lers

• Split-phase induction

Another common single-phase AC is the split-phase induction , commonly used in major appliances such as washing machines and dryers. Compared to the shaded pole , these can generally provide much greater starting torque by using a special startup winding in conjunction with a centrifugal switch. In the split-phase , the startup winding is designed with a higher resistance than the running winding

• Three-phase AC synchronous

If connections to the coils of a three-phase are taken out on slip-rings and fed a separate current to create a continuous (or if the consists of a permanent magnet), the result is called a synchronous because the will rotate synchronously with the rotating produced by the polyphase electrical supply. The synchronous can also be used as an alternator.

• Repulsion

These are wound- single-phase AC that are similar to universal . In a repulsion , the armature brushes are shorted together rather than connected in series with the . By transformer action, the stator induces currents in the , which create torque by repulsion instead of attraction as in other . Several types of repulsion have been manufactured, but the repulsion-start induction-run (RS-IR) has been used most frequently.

• DC

These are configured in many types and sizes, including brushless, servo, and gear types. A consists of a and a permanent stator. The is maintained using either permanent magnets or electro windings. DC are most commonly used in variable speed and torque applications.

• Linear

Another type of , Linear generate force only in the direction of travel. A linear applies thrust directly to a load, and does not require any intermediate mechanism to convert rotary motion into linear motion. Linear are capable of extremely high speeds, quick acceleration, and accurate positioning.

• Hydraulic

These are powered by pressurized hydraulic fluid and transfer rotational kinetic energy to mechanical devices. Hydraulic , when powered by a mechanical source, can rotate in reverse direction and act as a pump. Operating specifications and features are the most important parameters to consider when searching for hydraulic .

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