I have radial blade centrifugal fan design which will be mounted on exhaust side of electric traction motor.
The fan will be mounted on same motor shaft inside the housing.
How can I verify that due to flow resistances there won't be any restriction to flow inside the motor and thus for cooling.
Thanks.
Your radial fan makes a pressure increase dp (p_out minus p_in) per design. For sure, the motor inner pressure p_in just before the fan must not be lower than the ambient pressure minus the dp because then the flow through the fan will break down. But also before that limit the performance of the fan will deteriorate. What is needed is an estimation of the pressure loss of the flow in the motor to be cooled that depends on the flow rate. With this loss and the ambient pressure you get the fan inlet pressure p_in, and you can then find out wether the fan is able to keep the necessary flow rate for the cooling requirement. An iteration process yields the result.
To be more precise: p_in is not the ambient pressure minus the loss inside the motor, but of course additionally minus the inviscid, lossless pressure decrease that is necessary to make the flow, according to Bernoulli's equation.
Project objective: to improve the cooling of the electric motor.
So, mount a thermocouple inside the electric motor, thereby you can compare the internal temperature of the electric motor when using your centrifugal fan design x Standard design (or old design).
There are electric motors that are already supplied with this thermocouple option inside. But when disassembling the electric motor, you will find some point to fix the thermocouple.
- Badges
- Science topic
- Similar topics
- Engineering
- Mechanical Engineering