Motor type
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10-10-2016, 09:55 AM
Post: #1
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Motor type
Hello,
i made a b robot (classic evo version with jjrobot brain) and it is impossible to rise up without helping my robot. ![]() It seems to be a motor problem; i use a 3s 1300mah lipo with 2 steppers:NEMA17 Stepper Motor 40mm Long, 1.2A 200 steps per revolution (1.8 deg/step) 2 Phase bipolar 4 wires Rated Voltage 2V DC Rated Current 1.2A Phase Resistance: 1.7 Ohm ± 10% (20º C) Phase inductance: 4.5 mH ± 20% (1kHz 1 V rms) Holding torque: 0.4 N.m Min. Shaft diameter: 5mm / 0.188" (3/16") Shaft length: 22mm Motor depth: 40mm with drivers A4988 setted to 0.8V do you think with thoses my problem will be solved ?: Datasheet(17HS8401,1.8A,78 oz-in or 4.8kg.cm holding torque,5mm diameter shaft): thanks for help (i joined a video of my problem) |
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10-10-2016, 11:47 AM
Post: #2
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RE: Motor type
another info:
i tried with a pair of 3d printer stepper which i have; thoses are : Model: 17HS5425 Step angel: 1.8° Motor Length: 48 mm Shaft Length: 22 mm Rate Voltage: 3.1 V Rate Current: 2.5 A Resistance: 1.25 Ω Phase Inductance: 1.8 mH Static Moment: 48 N.cm Positioning Torque: 2.8 N.cm i didn't modify A4988 voltages And the result is the same... noise from motors when i try to rise up and after "balancing it by hands" a few moments, it is ok and the robot goes without problem. Do i need to modify drivers voltage settings ?? another idea: power supply cable: i soldered power supply on the brain board; is it possible ? thanks for help |
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10-11-2016, 06:44 AM
Post: #3
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RE: Motor type
Which microstep exposed hardware or software?
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10-12-2016, 08:55 AM
Post: #4
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RE: Motor type
(10-11-2016 06:44 AM)KomX Wrote: Which microstep exposed hardware or software?Hello Komx, i am not sure to understand your question but thanks for your help !: So, my drivers are two A4988 And i use the basic brobot code from jj robot so, microstep are setted to 1/16: Code: #define MICROSTEPPING 16 // 8 or 16 for 1/8 or 1/16 driver microstepping (default:16) (if you need i can do a new video) |
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