Amps Peak Stall, Continuous? I'm confused!

[dfstrasser]

I have some brushed servo motors that I have collected for my first router project. I plan on using G320's and the Campbell BOB. I'm confused on how to design a power supply. Do I use the "Is - Amps at Tc stall" for the current required? Can one power supply be used for all 3 motors or will 2 be necessary? Below are the motor specs:

Motor 1 (CMC)
Tpk - Torque, peak stall 94 Lb-in
Tc - Torque, continuous 17.11 Lb-in
Ip - Amps at Tpk 58.75 amps
Is - Amps at Tc stall 10.7 amps
Kv - Volts back EMF 18.94 volts/Krpm
Ep - Volta @ Tpk 22.56 volts
Max. Terminal Voltage 62 VDC@3227rpm

Motor 2 (CMC)
Tpk - Torque, peak stall 93 Lb-in
Tc - Torque, continuous 9.65 Lb-in
Ip - Amps at Tpk 53.45 amps
Is - Amps at Tc stall 5.55 amps
Kv - Volts back EMF 20.60 volts/Krpm
Ep - Volta @ Tpk 55.45 volts
Max. Terminal Voltage 99 VDC@4692rpm

Motor 3 (Yaskawa)
Peak rated torque 150 oz-in
Rated torque 50 oz-in
Peak current 18.8 amps
Voltage constant 6.0 volts/Krpm
Rated speed 3000 rpm

I'll be the first to admit that I'm "electrically challenged"! I've searched many times and read alot. However, I'm not sure what to do for a power supply and would appreciate any help.

[Al_The_Man]

The peak stall current is generally the absolute maximum the motor will take before demagnetization or destruction.
The continuous current will in all probability not occur for all motor at any given time, so a de-rating factor can be used, One supply should be able to provide for all three.
As a guide line, I would use 65% of total continuous current rating of all three.
Al.

[NC Cams]

When you stall the motor (lock the rotor so it simply can't rotate anymore), that is the point when Tpk is generated and Ip are at their maximums.

As the motor starts to rotate again, the current draw will drop to a lower value.

Depeding on the load condition that the motor is rated at (not readily apparent by perusal of specs), the continuous current (Ic) at the rated load condition results in the motor developing the torque value (Tc).

When the motor is stalled, the controller needs to fold back the voltage to prevent excessive current from being drawn by the motor. It appears that the fold back voltage needs to be at or below the "Ep" value spec'd for each motor. If the full terminal voltage were contintued to be applied at stall, the motors could encounter overheating and/or demagnitization issues.

[dfstrasser]

Thanks for the info guys. With alot of reading, I'm slowly beginning to understand.

Would a power supply rated at 65V/15A be appropriate? If so, do I have to decrease the voltage for the third motor or does the G320 take care of this.

[Al_The_Man]

Some PWM amplifier manufacturers specifiy DC supply can be 110% to 150% of motor terminal voltage, because between the DC supply and the motor is a PWM drive, not a 'straight' conductor.
That max terminal voltage of the third motor appears on the low side though, 18vdc?
I would check with Gecko support if that is the way you are going.
Al.