- #1

taylaron

Gold Member

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- 1

Greetings, I’m constructing a machine that involves a linear actuator powered by a 12vdc motor. My linear actuator has a foot that crushes an aluminum soda can until the motor’s torque maxes out and it stalls. The machine is intermittent duty at about 6 seconds of use every 3 minutes. My machine is powered by a 110vac 60hz outlet. The motor I’m using has the following specs:

http://www.robotmarketplace.com/products/0-PDX16.html

Speed : 1500 rpm @ 12Vdc

Amps @ nominal: 1.5 Amps

Efficiency: 45.33%

Peak Power: 0.55 hp

Stall current: 148 A

Stall torque: 1466 oz-in

Due to the very high stall current of my motor (148A), my budget prevents me from using a 2,000 watt AC-DC power supply.

**I don’t understand why the rated peak power is 0.55hp (410 watts) does not correspond to the calculated peak power at stall torque of ~2,000 watts (148A * 12v = 1776 watts).

I presume my only other alternative is to use batteries capable of that kind of output. I cannot afford LiPo batteries and they are also dangerous. Unless anybody can suggest an alternative power source, I have resolved to use NiMh or NiCd cell batteries. However, I am concerned about the lifetime of NiMh batteries in this solution. I was hoping this machine to be service free for a few years.

The automatic battery charger I would like to use is this:

http://www.robotmarketplace.com/products/0-DYN4077.html

manual: http://www.dynamiterc.com/ProdInfo/Files/DYN4077_manual.pdf

Specs: dynamite prophet sport II AC/DC peak charger.

• 1,2, Amp charge currents for AC input

• 110-240vac input

• 1-8 cells (1.2v to 9.6v)

Battery Capacity Charge Rate Charge Time*

1500mAh 2A, 40–60 Min.

3300mAh 3A ,60–80 Min.

5000mAh 4A, 60–80 Min.

* Charge times based on fully discharged

batteries.

Thank you for your time,

-Taylaron

http://www.robotmarketplace.com/products/0-PDX16.html

Speed : 1500 rpm @ 12Vdc

Amps @ nominal: 1.5 Amps

Efficiency: 45.33%

Peak Power: 0.55 hp

Stall current: 148 A

Stall torque: 1466 oz-in

Due to the very high stall current of my motor (148A), my budget prevents me from using a 2,000 watt AC-DC power supply.

**I don’t understand why the rated peak power is 0.55hp (410 watts) does not correspond to the calculated peak power at stall torque of ~2,000 watts (148A * 12v = 1776 watts).

I presume my only other alternative is to use batteries capable of that kind of output. I cannot afford LiPo batteries and they are also dangerous. Unless anybody can suggest an alternative power source, I have resolved to use NiMh or NiCd cell batteries. However, I am concerned about the lifetime of NiMh batteries in this solution. I was hoping this machine to be service free for a few years.

__I’ve posted this because I’m having difficulty finding an alternative power source. Also, because I’m having difficulty calculating how many amp-hours I need to have while being able to recharge my battery before the next motor cycle. Also, can anybody tell me if NiMh batteries can supply 150A peak current safely without damaging the battery?__. I intend to automatically disconnect the charger while the machine is running, then automatically reconnect as soon as it has stopped drawing power.The automatic battery charger I would like to use is this:

http://www.robotmarketplace.com/products/0-DYN4077.html

manual: http://www.dynamiterc.com/ProdInfo/Files/DYN4077_manual.pdf

Specs: dynamite prophet sport II AC/DC peak charger.

• 1,2, Amp charge currents for AC input

• 110-240vac input

• 1-8 cells (1.2v to 9.6v)

__***Does this mean the whole battery pack has to be between 1.2v and 9.6v or is this the voltage per cell? Because my battery pack needs to be 12v__Battery Capacity Charge Rate Charge Time*

1500mAh 2A, 40–60 Min.

3300mAh 3A ,60–80 Min.

5000mAh 4A, 60–80 Min.

* Charge times based on fully discharged

batteries.

Thank you for your time,

-Taylaron

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