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DRV8462EVM: Similar Motors show different performance

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Part Number: DRV8462EVM
Other Parts Discussed in Thread: DRV8462

Using the DRV8462 to drive 2 Stepper Motors gives different performance values. As one Motor was able to run, the other does not run at all.

1) TI Evaluation Board DRV8462, Supply Voltage 48V, Supply Current 8A

2) Motor under Test Motor 2A: 23H2076-200 and Motor 4A: 23H2076-400

3) Break

Type

Current

Resistance

Inductance

Holding Torque

Rotor Inertia

Length

Mass

 

(A)

(Ω)

(mH)

(N·m)

(g·cm2)

(mm)

(g)

23H2076-400

4

0.6

2.4

2

480

76.5

1060

23H2076-200

2

2.4

9

2

480

76.5

1060

The Motor 4A with Full Scale Current 5A was able to turn with differnt speeds and torque:

Speed [rpm]

 Torque [Nm]

300

1.34

600

1.1

900

0.27

1200

0.28

1500

0.09

1800

0.25

2100

0.06

2400

0.06

2700

0.24

3000

0.2

3300

0

3600

0

The Motor 2A with Full Scale Current 2.83A (also differnt values tested) was able to turn only to a speed of 400rpm. Higher speed where not possible.


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