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Motors cooling guide Cooling ?? November Guide Cooling systems for electric motors CContents Why proper cooling is important Reading an IC code The most common cooling methods IC TEFC IC TENV IC TEFV IC TEAO Alternative cooling methods Selecting the right

Cooling ?? November Guide Cooling systems for electric motors CContents Why proper cooling is important Reading an IC code The most common cooling methods IC TEFC IC TENV IC TEFV IC TEAO Alternative cooling methods Selecting the right cooling About Hoyer C Why proper cooling is important Like in many other situations in life the right level of cool can mean the di ?erence between keeping things running smoothly and su ?ering a heat-induced breakdown When an electric motor is in operation the rotor and stator losses generate heat which must be managed through an appropriate cooling method E ?cient cooling ?? or the lack thereof ?? has a signi ?cant impact on the lifetime of your motor This is especially the case for the bearings and the insulation system which are the components most vulnerable to overheating In addition long-term overheating can cause metal fatigue This basic rule of thumb illustrates the relationship between heat and lifetime The lifetime of your motor ? s isolation system is divided by two for every C over the rated temperature and multiplied by two for every C below The lifetime of your motor ? s bearing grease is divided by two for every C over the rated temperature and multiplied by two for every C below In addition to ensuring the health of the motor maintaining optimal temperature levels are important to avoid e ?ciency reduction in general In short ensuring proper heat management results in a more reliable and robust motor with a longer lifetime And with an e ?ective cooling system it is often possible to use a smaller motor which carries signi ?cant size- weightand cost reductions There are many cooling options available for electric motors The optimal choice depends on your application where the motor is mounted the operating environment and several other factors In this guide we give you what you need to know to make an informed choice C Reading an IC code In the IEC - standard several suitable methods for e ?cient cooling of electric motors are de ?ned Each method is designated with an IC code which breaks down the individual elements of the cooling method In the IEC - standard several suitable methods for e ?cient cooling of electric motors are de ?ned Each method is designated with an IC code which breaks down the individual elements of the cooling method The IC code can be expressed with either a long or short designation e g IC A A IC which is broken down as follows IC A Code letters Circuit arrangement Free circulation Frame surface cooled Primary coolant A Air long designation only Method of movement of primary coolant Free convection Self circulation A Secondary coolant A Air W Water long designation only Method of movement of secondary coolant Free convection Self circulation Machine mounted independent component Relative displacement IC code vs NEMA designation In some cases letter acronyms based on the NEMA National Electrical Manufacturers Association de ?nitions are used