Strong air cooling structure of broadband variable-frequency motor

Abstract

The invention discloses a strong wind cooling structure of a broadband variable-frequency motor, and solves the problems of how to meet the heat dissipation requirement of a high-power and wide-frequency-conversion variable-frequency motor and how to greatly reduce the occupied space of the whole equipment. A double-air-path cooling structure is adopted in the motor, the traditional mode that an air-air heat exchange cooler is arranged at the top end of the motor is changed, the air-air heat exchange cooler is omitted, and a centrifugal fan on a rotating shaft of the motor is omitted; a driving end and a non-driving end on the front side of a motor shell are respectively provided with a front air inlet, a driving end and a non-driving end on the rear side of the motor shell are respectively provided with a rear air inlet, an air outlet is formed in the middle of the rear side of the motor shell, a cooling fan is connected to the air outlet, and a double-loop strong air cooling air path is formed in the motor through the cooling fan; therefore, the strong wind cooling of the motor is realized, and the occupied space of the whole equipment is saved.

Description

technical field [0001] The invention relates to a variable frequency motor, in particular to a strong air cooling structure of a wide frequency variable frequency motor. Background technique [0002] In large-scale laboratories, frequency conversion motors with a wide frequency range are generally equipped. The motors need to be frequently operated at speeds between 0-50Hz. The power density of the frequency conversion motors is relatively high. During operation, the motor will heat up very much. Serious; the existing ventilation cooling structure of this type of motor generally adopts a double-air cooling structure. There is an air outlet, and centrifugal fans are installed at both ends of the motor shaft inside the motor housing, and a larger cooler wind cover is installed above the top of the motor housing, and a shaft is arranged in the cooler wind cover. The air-cooled pipe in the direction of the cooler BS is provided with a cooling fan connected with the air-cooled p...

AI Technical Summary

Problems solved by technology

[0002] In large-scale laboratories, frequency conversion motors with a wide frequency range are generally equipped. The motors need to be frequently operated at speeds between 0-50Hz. The power density of the frequency conversion motors is relatively high. During operation, the motor will heat up very much. Serious; the existing ventilation cooling structure of this type of motor generally adopts a double-air cooling structure. There is an air outlet, and centrifugal fans are installed at both ends of the motor shaft inside the motor housing, and a larger cooler wind cover is installed above the top of the motor housing, and a shaft is arranged in the cooler wind cover. The air-cooled pipe in the direction of the cooler BS is provided with a cooling fan connected with the air-cooled pipe; when the motor is running, relying on the centrifugal fans at both ends of the motor shaft, the cold air in the cooler cover passes through the top of the AS end and the BS end The air inlet is sucked into the motor casing, and the cold air then passes through the axial air duct on the motor rotor and the radial air duct on the stator to cool the motor, and the heated air finally returns to the cooling machine through the air outlet. In the cooler cover, the hot air returning to the cooler cover and the cold air in the air-cooled pipe perform air-to-air heat exchange, and the cooled air enters the motor again through the air inlets on the top of the AS end and BS end to form a cycle Air-cooled system; the volume of the cooler shell of this cooling structure is basically close to the volume of the motor shell. Therefore, the variable frequency motor and cooler need to occupy a large installation space, but when the laboratory space is limited, The motor with this structure will encounter the problem that the installation space cannot be satisfied; especially when the frequency conversion motor runs for a long time at a very low frequency, there will also be the above-mentioned circulating air-cooled cooling system, which cannot meet the heat exchange requirements. The current design is to add a strong cooling fan on the top of the cooler cover to speed up the flow rate of the circulating cooling air in the motor and cooling cover to meet the heat exchange requirements, but the addition of a strong cooling fan will further increase the Increased the requirements for equipment installation space; how to meet the heat dissipation requirements of high-power and wide-frequency variable frequency motors, and greatly reduce the occupied space of the entire equipment has become a problem that needs to be solved on site

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