Totally-Enclosed Fan-Cooled Motor Drive Side Bearing Cooling
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Solution Overview
Problem
Conventional totally-enclosed fan-cooled motors experience elevated bearing temperatures and grease degradation when a sealed snow protection cover is applied, as cold air is prevented from reaching the drive side bearing's heat radiator.
Innovation Solution
The design includes a ventilation path that directs cooling air from an external fan to the drive side bearing area, passing through a heat radiator, and discharging air from the gap between the sealed snow protection cover and the drive side bracket, ensuring effective cooling even with the cover in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealed snow protection cover is applied to protect the joint from freeze damage, then the joint is protected from snow and ice, but cold air cannot reach the heat radiator on the drive side bearing, causing bearing temperature to rise and grease to degrade
Solution Approach 1:
The patent divides the cooling system into separate ventilation paths: one path (first ventilation path) supplies cold air to the heat radiator on the drive side bearing for bearing cooling, while another path (second ventilation path) allows air circulation around the joint. This segmentation enables the snow protection cover to seal the joint area while maintaining dedicated cooling channels that bypass the sealed region, thus protecting the joint from snow/ice while preventing bearing temperature rise
Solution Approach 2:
The patent introduces a heat radiator as an intermediary component between the drive side bearing and the external environment. The heat radiator receives cold air through the first ventilation path and transfers heat from the bearing to the passing air, which is then discharged through the third ventilation path. This intermediary mechanism enables effective heat dissipation even when the joint is sealed by the snow protection cover, as the cooling pathway is independent of the joint sealing
2Reliability
If a sealed snow protection cover is applied, then the joint is protected from snow and ice, but the cooling effect of the drive side bearing deteriorates due to blocked air supply to the heat radiator
Solution Approach 1:
The ventilation system is segmented into multiple independent paths: the first ventilation path is dedicated to supplying cold air to the heat radiator for bearing cooling, the second ventilation path handles general air circulation, and the third ventilation path discharges cooled air. This segmentation allows the snow protection cover to seal the joint region without interfering with the dedicated cooling pathway, maintaining bearing cooling effectiveness while providing joint protection
Solution Approach 2:
The patent positions the heat radiator and first ventilation path to receive cold air from the external environment before the air enters the sealed joint region. The cold air is pre-cooled and directed to the heat radiator in advance, ensuring the bearing cooling function is established prior to and independent of the snow protection cover installation, thus maintaining cooling effectiveness even with the sealed cover in place
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the cooling effect of the drive side bearing, preventing temperature increases and grease degradation, even when the snow protection cover is applied.
Implementation Method 1
a stator is cooled by causing cooling air to pass through a first ventilation path formed in the stator by an external fan arranged on the counter drive side
Implementation Method 2
a heat radiator arranged on the drive side (for example, Patent Literature 1)
Implementation Method 3
a heat radiator arranged on the drive side
Data Source
Figure 1
Figure 2
Figure 3(a)~3(c)
AI summary
The totally-enclosed fan-cooled motor includes the stator 13; the rotor 4; the drive side bracket 6; the counter drive side bracket 8 arranged at the other end of the frame 10; a pair of the bearings 7 and 9 that support the drive side 1a and the counter drive side 1b of the rotation shaft 1; the external fan 15 that is arranged on an outer side of the counter drive side bracket 8, is mounted on the rotation shaft 1, and sends cooling air to the stator 13; the internal fan 5 that is arranged in the frame 10 and sends air in the motor to the rotor 4 and the stator 13 by circulating the air; the disk-shaped heat radiator 17 that is arranged on an inner side of the drive side bracket 6 and is mounted on the rotation shaft 1; the snow protection cover 20 that is mounted on an outside of the drive side bracket 6; the ventilation path 18 that induces part of the cooling air taken in from the external fan 15 to the drive side bracket 6 without contacting the frame 10; and the ventilation path 19 that is arranged between the drive side bracket 6 and the snow protection cover 20, and includes the outlet 19a that communicates with the ventilation path 18, causes the cooling air passed through the ventilation path 18 to pass through the heat radiator 17, and discharges the cooling air outside the motor.