Nema 34 Stepper Motor Bipolar Current Input

Other Hardware Motors, Mechanics, Power and CNC
1

Hello, I am building a compression tester using an E Series Nema 34 Bipolar Stepper Motor (34HE45-6004S) and Digital Stepper Driver (DM860T). Since the motor has 2 phases, do I input 12A/36V or 6A/36V into the driver? I am planning on micro stepping.

Nema 34 (34HE45-6004S)
###Electrical Specification:

  • Manufacturer Part Number: 34HE45-6004S
  • Number of phase: 2
  • Step Angle: 1.8deg
  • Holding Torque: 8.2Nm(1161.22oz.in)
  • Rated Current/phase: 6.0A
  • Phase Resistance: 0.51ohms± 10%
  • Inductance: 5.1mH±20%(1KHz)

Digital Stepper Driver (DM860T):

Key Features:

  • Automatic idle-current reduction
  • Suitable for 2-phase and 4-phase motors
  • Support PUL/DIR and CW/CCW modes
  • Over-voltage, over-curren protection
  • Soft-start with no "jump" when powered on
  • 5V/24V logic voltage selector, default setting 24V
  • Anti-Resonance provides optimal torque and nulls mid-range instability
  • Pulse input frequency up to 200KHz, TTL compatible and optically isolated input
  • 8 selectable peak current including 2.40A, 3.08A, 3.77A, 4.45A, 5.14A, 5.83A, 6.52A, 7.20A
  • Motor auto-identification and parameter auto-configuration technology, offers optimal responses with different motors
  • Multi-Stepping allows a low resolution step input to produce a higher microstep output, thus offers smoother motor movement
  • 16 selectable microstep resolutions including 400, 800, 1600, 3200, 6400, 12800, 25600, 51200, 1000, 2000, 4000, 5000, 8000, 10000, 20000, 40000

Electrical Specifications:

  • Output Peak Current: 2.4~7.2A(6.0RMS)
  • Logic Signal Current: 7~16mA(Typical 10mA)
  • Pulse Input Frequency: 0~200kHz
  • Pulse Width: 2.5μS
  • Isolation Resistance: 100MΩ
  • Input Voltage: +18~80VAC or 36~110VDC

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2

The rated current parameter tells 6A per phase. I would go for a 15- 20 Amp supply, in order to have some margin.
It's not unusual that a supply like that either delivers the voltage or the Amps, but not both at the same time !

3

so a 36V 15A power supply should work? I was able to find a 36V 15A power supply

4

Your motor needs 6A per coil with 0.51 Ohm. That means about 18W per coil or 36W for the motor. Because of losses and some safety margin a 72W PSU should be sufficent. E.g 36V/2A.

6

No, you need 72W, that's 36V 2A. With a high voltage the current from the PSU is much less than the coil current. The higher the voltage ( within the driver limits ) the lower the current.

7

How come the torque curve for the motor uses 6A?

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8

The higher the speed, the more often the driver has to invert the coil current. But it needs time to invert the coil current. So the effective coil current will drop with higher speeds, what means lower torque. With higher voltage, the inverting of the current needs less time, so the coil current (and torque) will drop less with higher speed.

9

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