What are the recomended volts and amps for max torque?

The torque in a stepper motor is proportional to the current. For the motor in question, the max current is shown as 2A. The winding resistance is given as 1.4 ohms per phase which works out the 2.8 Volts (2 amps x 1.4 ohms). However, this is not the end of the story. In order to achieve the 2 amp rating once the motor is in motion, requires a much higher supply voltage than 2.8 Volts. This is because once the motor moves, it generates a internal voltage that subtracts from the supply voltage. Additionally, the motor winding inductance prevents the current from rising immediately. To counteract these two forces, you need to apply a much higher voltage to the motor to force the current to the desired level. Using a modern stepper driver that provides adjustable current limiting makes this easy. The overdrive voltage needed will depend on the maximum voltage that the driver can handle, the insulation breakdown voltage of the stepper motor, and the desired speed you need reach. A good starting point is 10 X the value obtained by looking at the the winding resistance and maximum current ratings. In this case 2.8V (see above). That would imply that an overdrive voltage of 28V would be reasonable to use. If you chose this voltage, make sure the stepper driver can handle it. Also make sure your power supply can supply the current. You can back this value down as needed if you don't have to run a very high speeds. Hope this helps you out.

Will this stepper motor work as a replacement for a soyo sy42sth47-1504a used in the lulzbot mini 3d printer?

Based on my review of the two sets of specs, my answer is, this motor will PROBABLY work as a replacement. The physical dimensions and the step angle are a match. This motor requires somewhat more current and has slightly more torque. Unless I missed an important detail, I believe that these motors will work.

I am using a TB6600 at 2 amps and 36 volts and get over 1,000 rpm but have to use an acceleration curve as the motor won't go from a dead stop to that rpm without stalling.

Is the 2A max/peak? What's an expected normal amperage?

2A is rated current, we recommend you drive this motor with rated current.

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Nema 17 Stepper Motor Bipolar 2A 59Ncm(84oz.in) 48mm 3D プリンタステッピングモータバイポーラ4リード3Dプリンタ/ CNC [並行輸入品]

Nema 17 Stepper Motor Bipolar 2A 59Ncm(84oz.in) 48mm 3D プリンタステッピングモータバイポーラ4リード3Dプリンタ/ CNC [並行輸入品]

Product ID: 758914417

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Voltage
12 Volts
Horsepower
1.4 hp
Product Dimensions
42W x 42H mm
Item Weight
0.88 Pounds
Shaft Diameter
5 ミリメートル

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Part number	17HS19-2004S1
Item Weight	399 g
Product Dimensions	4.2 x 4.2 x 4.8 cm; 399.16 g
Is Discontinued By Manufacturer	No
Color	MXH-321
Voltage	12 Volts
Horsepower	1.4 hp
Batteries Included	No
Batteries Required?	No
Item Dimensions LxWxH	42 x 42 x 48 mm

Nema 17 Stepper Motor Bipolar 2A 59Ncm(84oz.in) 48mm 3D プリンタステッピングモータバイポーラ4リード3Dプリンタ/ CNC [並行輸入品]

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