Induction motor auxiliary cooling system

A kit having component parts capable of being assembled to provide auxiliary cooling for an induction motor having an exterior surface with spaced motor cooling fins, comprising:

• a buffet thermal shroud adapted for orientation in opposed spaced relationship over the spaced motor cooling fins,
• after said orientation, the shroud adapted for defining an airflow channel between itself and the spaced motor cooling fins, for direction and passage of a cooling air flow;
• and
• a plurality of tabs adapted for orientation in the airflow channels between the spaced motor cooling fins, so that when so oriented are in thermal and fluid communication with the cooling air flow,
• wherein the plurality of tabs are oriented in an array, and
• wherein the plurality of tabs are of different respective lengths between the spaced motor cooling fins.

A totally enclosed fan cooled (TEFC) induction motor, comprising:

• a motor housing having an exterior surface with spaced motor cooling fins;
• a cooling fan within a fan housing for generating and directing a cooling airflow that is in communication with the spaced motor cooling fins;
• a buffet thermal shroud oriented in opposed spaced relationship over the spaced motor cooling fins,
• an airflow channel defined by the fan housing, the spaced motor cooling fins and the shroud, for direction and passage of the cooling air flow;
• and
• a plurality of tabs in the airflow channel between the spaced motor cooling fins, where the plurality of tabs is in thermal and fluid communication with the cooling air flow, the plurality of tabs comprising shroud fingers projecting inwardly from the shroud, the shroud fingers oriented in an array of parallel rows;
• wherein the spaced motor cooling fins comprises a pair of spaced motor cooling fins oriented parallel to airflow from the cooling fan and the fan housing;
• and
• wherein a series of fingers is aligned in a row between the pair of spaced motor cooling fins from proximal to distal of the cooling fan and the fan housing, each distal finger in the row being progressively longer than each prior finger.