VARIABLE FREQUENCY DRIVES THEORY, APPLICATION, …
winding in order to develop mechanical torque. The stator windings of an induction motor are evenly distributed by 120 degrees electrical. As the three phase current enters the windings, it creates a rotating magnetic field within the air gap (the space between the rotor and stator laminations). The speed
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UNIFIED FACILITIES CRITERIA (UFC) - …
www.maintenance.orgufc 3-600-02 1 january 2001 approved for public release: distribution unlimited unified facilities criteria (ufc) operations and maintenance: inspection, testing,
EXPERIMENTAL MODAL ANALYSIS - maintenance.org
www.maintenance.orgExperimental modal analysis has grown steadily in popu-larity since the advent of the digital FFT spectrum analyzer in the early 1970’s. Today, impact testing (or bump testing) has become widespread as a fast and economical means of finding the modes of vibration of a machine or structure.
DYNAMIC ABSORBERS FOR SOLVING RESONANCE PROBLEMS
www.maintenance.org1 DYNAMIC ABSORBERS FOR SOLVING RESONANCE PROBLEMS Randy Fox Senior Staff Instructor Entek IRD International Corp. Houston, TX ABSTRACT Many experts in vibration analysis will agree that resonance is one of the five most common causes of excessive
Tool Box Training - How to Torque Electrical Connections
www.maintenance.orgelectrical connections is contained in two elements: start with clean contact surfaces, and apply the correct force. 3. When it comes to electrical connections there are many. Some of which are; (a) solid connections (e.g., bus bars), (b) lug connections (e.g., switchgears), (c) molded terminal connection (e.g., breakers), (d) screw terminals
INTERNATIONAL ISO STANDARD 14224 - Maintenance
www.maintenance.orgbased on common ground, a standard is required. This International Standard gives recommendations to the petroleum and natural gas industry on specification and execution of RM data collection, both as a separate exercise and in the day-to-day recording of historical data in maintenance management systems. 1) Guideline for Data Collection.
Vibration acceptance criteria - AMP Maintenance Forums
www.maintenance.orgoperation. • Just tolerable (Zone C): Machines with vibration within this zone are normally considered unsatisfactory for long-term continuous operation. Generally, the machine may be oper-ated for a limited period in this condition until a …
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Electric Motor Problems & Diagnostic Techniques
www.emerson.comStator-related failures account for a large portion of all electrical problems on AC motors. Most stator faults are caused by insulation breakdown which leads to winding failure. They include: 1. Open windings 2. Phase-to-ground 3. Phase-to-phase 4. Turn-to-turn short If the motor keeps running with stator faults, a high current will