The historical development of the DC motor as an electric variable-speed drive since the beginning of the twenties has meant
that DC motors are customarily used with internal/forced ventilation (approx. 85 % of VSDs ≤ 250 kW).
For variable-speed AC drives, asynchronous standard motors have predominantly been utilized since the 70s/80s, which mostly
feature surface ventilation (approx. 90 % of VSDs ≤ 250 kW). Thus the process of matching the three-phase standard motors
to the requirements applying for variable-speed drives with AC converters has not yet been concluded.
The fact that AC motors with ratings of up to approx. 1400 kW are supplied in degree of protection IP 54 as standard is a tribute
to their simple and sturdy construction. For drive jobs in hazardous areas, explosion-protected AC motors are used almost
exclusively. This means that the AC motor has won itself a firm position and proved its practical utility most especially in those
sectors of industry characterized by aggressive ambient conditions and a high degree of dirt and dust in the cooling air.
that DC motors are customarily used with internal/forced ventilation (approx. 85 % of VSDs ≤ 250 kW).
For variable-speed AC drives, asynchronous standard motors have predominantly been utilized since the 70s/80s, which mostly
feature surface ventilation (approx. 90 % of VSDs ≤ 250 kW). Thus the process of matching the three-phase standard motors
to the requirements applying for variable-speed drives with AC converters has not yet been concluded.
The fact that AC motors with ratings of up to approx. 1400 kW are supplied in degree of protection IP 54 as standard is a tribute
to their simple and sturdy construction. For drive jobs in hazardous areas, explosion-protected AC motors are used almost
exclusively. This means that the AC motor has won itself a firm position and proved its practical utility most especially in those
sectors of industry characterized by aggressive ambient conditions and a high degree of dirt and dust in the cooling air.
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