Do metals get more resistive as their temperature rises? Will a heat sink make an electric motor more efficient?
2006-06-25 03:37:55 · 11 answers · asked by Michael B 2 in Science & Mathematics ➔ Engineering
Yes a motor becomes less efficient as heat increases the resistance in the coil to an appreciable level hence the current decreases
resulting in less magnetic field and less effeciency
So a heat sink can help in increasing effficiency
2006-06-25 03:41:27 · answer #1 · answered by mohit 2 · 0⤊ 0⤋
The nameplate data on most large electric motors specifies the maximum allowable ambient temperature. The motor shaft often includes a small fan to help circulate ambient air which should limit temperature rise. The electric coils are designed to carry allowable current which also limits temperature rise (provided the motor is not operated with a locked shaft). The increase of temperature in a coil increases its resistance which should reduce current. Likely the motor temperature (and efficiency) will depend most on how heavily loaded the motor is in service; especially if there is a duty cycle that constantly changes loading.
2006-06-25 13:19:45 · answer #2 · answered by Kes 7 · 0⤊ 0⤋
Do metals get more resistive as their temperature rises?
its not all true bcoz upto a certain temp. the machine works efficiently but as the the temp. goes on increasing the friction becomes more.
a heat sink may make an electric motor more efficient.
2006-06-25 06:51:47 · answer #3 · answered by Anonymous · 0⤊ 0⤋
The lesser the temperature, the more efficient a motor will be. Remember that heat is an energy, a wasted energy. power in = power out + power loss. power loss leads to friction and heat. If heat is minimized, more power output will be made, this means a better efficiency.
Heat sink will help dissipate the heat but will not affect the work output. better find out whats causing the heat. If the heat is normal, you cant hel it. Heat sinks just lessen the damage caused by heat.
2006-06-25 04:31:30 · answer #4 · answered by cormac_pendragon 2 · 0⤊ 0⤋
No not really. Though heat is a factor on magneticly generated electicity it is not your the big problem. It will break when it overheats. Usually it will shutdown automatically before that happens. (lucky us)
So if your motor has to work hard and often gets to hot than cooling it down will ensure it can work longer. So it would improve efficiency.
2006-06-25 03:44:39 · answer #5 · answered by Puppy Zwolle 7 · 0⤊ 0⤋
yes electric motors run less efficient with heat. ie the amps drawn rise with greater heat making it more exp. to run and more prob. of damage. Making the motor less efficient at normal temps.
2006-06-25 03:42:24 · answer #6 · answered by cwbyup1980 1 · 0⤊ 0⤋
Yes, as an object gets hotter, the particles that it is made up of move faster. And I suppose some of these particles are released by heat and also by friction.
2006-06-25 03:43:23 · answer #7 · answered by Anonymous · 0⤊ 0⤋
i would think a heatsync would make an electric motor more efficient......makes sense to me
i have an electric lawn mower that shuts down when it gets too hot.....i think you have a good theory!
2006-06-25 03:41:53 · answer #8 · answered by Cap'n Donna 7 · 0⤊ 0⤋
Congratulations Sir, you are a genius.
2006-06-25 03:45:10 · answer #9 · answered by ash_m_79 6 · 0⤊ 0⤋
Metals are so much better and faster.
2006-06-25 03:39:44 · answer #10 · answered by khrystinas2005 2 · 0⤊ 0⤋