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Band saws! You love 'em, We got 'em. Our selection of band saws are so good, you may need to pinch yourself. Find Cheap band saws right here as well as discount band saws! Look hereTHE MOTORMost hermetic compressors use induction motors cooled by either liquid or suction-gas refrigerant. Induction motors have copper windings that, when alternating current is run through them, create the magnetic fields that cause the motor to turn. These copper windings are bulky, adding size and weight to the compressor.Two-pole, 60-Hz induction motors operate at approximately 3,600 rpm. A higher number of revolutions per minute can be obtained by increasing the frequency. Compressors that require higher shaft speeds tend to use gears. While gears are a proven technology, they create noise and vibration, consume power, and require lubrication.The magnet-bearing compressor features a synchronous permanent-magnet brushless DC motor with a completely integrated variable-frequency drive (VFD). The stator windings found on conventional induction motors are replaced with a permanent-magnet rotor. Alternating current from the inverter energizes the armature windings. The stator (excitation) and rotor (armature) change places. No commutator brushes are required. The motor and key electronic components are internally refrigerant-cooled, so no special cooling is required for the VFD or the motor. The machine''s speed and drive functions in either steering mode is controlled through the left-hand joystick, while the right-hand joystick controls lift and tilt functions, as well as auxiliary hydraulic functions. The joysticks were supplied by Sauer-Danfoss eletrohydraulics, with a grip that is proprietary to Bobcat and co-developed by Sauer-Danfoss.In all-wheel steer mode, the wheels follow a precisely engineered turning pattern designed to provide the highest amount of maneuverability with the lowest amount of impact to the surface. "There are variations in speed from the inside and outside wheels, as well as different turn angles," said Osborn. "The outside tire will turn at a 13[degrees] angle in a full turn and the inside tire turns at up to 24[degrees], no matter which way you''re turning. The inside and outside are at different angles and different speeds in order to minimize the turf disturbance, the marking on the asphalt, concrete, the tire wear, all the things that we were looking to address." ©2003 www.band-saws-for-sale.com. All rights reserved. |