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i had a 180 watt, 8 amp motor and it blew a 30 amp fuse. i ordered a 1000 watt (at 36v) (745 watt at 25v) motor. it's rated current is 34 amps. what rated amp fuse should i use?
o and it's for an electric bike motor. if anyone knows: could i use a resettable breaker? if so where could i get one that can run off 24 or 36 volts dc??
thanks.
Answer
Electric motors draw a large amount of current on startup and much smaller amounts after they come up to speed. What you need is called a "slow blow fuse". Such fuses can handle up to 10 times the current they are rated to handle for a short period of time, a few seconds or less. The actual fuse rating should be specified by the manufacturer of the motor. In the absence of such a recommendation, use a fuse rated the same or slightly higher than the continuous current rating.
A properly rated circuit breaker should work in place of a fuse.
Here's a 24V resettable circuit breaker rated for 40A. This one should be suitable, since it's intended purpose is to operate a motor and the added startup current would have already been considered in the design.
http://www.marineengine.com/products/accessory.php?in=2971040
Electric motors draw a large amount of current on startup and much smaller amounts after they come up to speed. What you need is called a "slow blow fuse". Such fuses can handle up to 10 times the current they are rated to handle for a short period of time, a few seconds or less. The actual fuse rating should be specified by the manufacturer of the motor. In the absence of such a recommendation, use a fuse rated the same or slightly higher than the continuous current rating.
A properly rated circuit breaker should work in place of a fuse.
Here's a 24V resettable circuit breaker rated for 40A. This one should be suitable, since it's intended purpose is to operate a motor and the added startup current would have already been considered in the design.
http://www.marineengine.com/products/accessory.php?in=2971040
How do you put a chain driven motor on a bike with suspension?
Dug
I was thinking about putting a motor on an electric motocross bike so it goes faster, the only problem is is that the motorbike has suspension in the back and I was wondering if a chain driven motor can be mounted so when I hit a bump with the suspension the chain won't pop off or become stressed.
Answer
The sprocket needs to be roughly lined up with the center-line of the swing arm and not far from the pivot point. Just a random gas engine has nearly a zero percent chance of working since the output shaft is usually centered and too high on the engine. That, and you would have to find a clutch for it, make sure the sprockets line up perfectly, and fabricate a mounting system. You would also have to make a functional gas tank unless there was one mounted to the engine.
By the time you were done, you could have sold your old bike and bought a real dirt-bike. I see older used ones for sale in my local CL for $500-1000 all the time.
The sprocket needs to be roughly lined up with the center-line of the swing arm and not far from the pivot point. Just a random gas engine has nearly a zero percent chance of working since the output shaft is usually centered and too high on the engine. That, and you would have to find a clutch for it, make sure the sprockets line up perfectly, and fabricate a mounting system. You would also have to make a functional gas tank unless there was one mounted to the engine.
By the time you were done, you could have sold your old bike and bought a real dirt-bike. I see older used ones for sale in my local CL for $500-1000 all the time.
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Title Post: How do you find what amp fuse to use for electric motor.?
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Rating: 83% based on 9498 ratings. 4 user reviews.
Author: Unknown
Thanks For Coming T0 My Blog
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