chrisd7306
Tue 18 November 2008, 18:09
Hello All,
I have the choice of some stepper motors that have approx. the same
torque but have different sized frames ( 60mm Vs 85mm).
The 60mm frame spec. is:-
1) new high torque hybrid motor
2) holding torque 31 kg/cm (430 oz.ins)
3) 60 x 60 face , 88mm long, shaft dia. 6.35mm (1/4 in)
4) 8 wire
5) 4.2V, 2.8A/phase, 6.8 mH inductance, 840 gm.cm2 rotor inertia
6) 1 kg.cm detent torque
7) 1.4 kg weight
8) 1.8 degree step angle
The 85mm frame spec. is:-
1) new hybrid motor
2) holding torque 31 kg/cm (450 oz.ins)
3) 85 x 85 face , 98mm long, shaft dia. 12.7mm (1/2 in)
4) 8 wire
5) 2.0A/phase, 18 mH inductance, 1400 gm.cm2 rotor inertia
6) 1.2 kg.cm detent torque
7) 2.3 kg weight
8) 1.8 degree step angle
Question 1: What are the advantages/disadvantages of having a small
frame over the large frame?
Question 2: Which would last the longer in service?
Question 3: Is larger better?
Question 4: Will the smaller motor be "much more stressed" due to the
loss of bulk in the motor
Some of the advantages that I see is that:-
1) the small motor will be able to accelerate/de-accelerate quicker
due to the lower internal inertia.
2) heat will disipate much quicker in a small motor
3) less mass on y and z axis
I have noticed that the new generation of stepper motor is much
smaller that those of 10 years ago and the performance has greatly
increased.
I have looked at the Vexta stepper motor catalog and a similiar
comparision is between the PV series, 2 phase motor and the standard
PK series motor but there are no details given on the advantages of
using the PV series over any of the other series of motor.
I would like to hear what other people who have possibly experienced
the differences or could enlighten me on issues that I have not
considered.
[Each motor will use a 3.6:1 belt drive reduction unit to drive each axis]
In Australia there are no agents for the Vexta stepper motor. Most of the stepper motors I have seen are from China and seem to be reasonable in quailty and price
Thanks for any help
Cheers
Chris
I have the choice of some stepper motors that have approx. the same
torque but have different sized frames ( 60mm Vs 85mm).
The 60mm frame spec. is:-
1) new high torque hybrid motor
2) holding torque 31 kg/cm (430 oz.ins)
3) 60 x 60 face , 88mm long, shaft dia. 6.35mm (1/4 in)
4) 8 wire
5) 4.2V, 2.8A/phase, 6.8 mH inductance, 840 gm.cm2 rotor inertia
6) 1 kg.cm detent torque
7) 1.4 kg weight
8) 1.8 degree step angle
The 85mm frame spec. is:-
1) new hybrid motor
2) holding torque 31 kg/cm (450 oz.ins)
3) 85 x 85 face , 98mm long, shaft dia. 12.7mm (1/2 in)
4) 8 wire
5) 2.0A/phase, 18 mH inductance, 1400 gm.cm2 rotor inertia
6) 1.2 kg.cm detent torque
7) 2.3 kg weight
8) 1.8 degree step angle
Question 1: What are the advantages/disadvantages of having a small
frame over the large frame?
Question 2: Which would last the longer in service?
Question 3: Is larger better?
Question 4: Will the smaller motor be "much more stressed" due to the
loss of bulk in the motor
Some of the advantages that I see is that:-
1) the small motor will be able to accelerate/de-accelerate quicker
due to the lower internal inertia.
2) heat will disipate much quicker in a small motor
3) less mass on y and z axis
I have noticed that the new generation of stepper motor is much
smaller that those of 10 years ago and the performance has greatly
increased.
I have looked at the Vexta stepper motor catalog and a similiar
comparision is between the PV series, 2 phase motor and the standard
PK series motor but there are no details given on the advantages of
using the PV series over any of the other series of motor.
I would like to hear what other people who have possibly experienced
the differences or could enlighten me on issues that I have not
considered.
[Each motor will use a 3.6:1 belt drive reduction unit to drive each axis]
In Australia there are no agents for the Vexta stepper motor. Most of the stepper motors I have seen are from China and seem to be reasonable in quailty and price
Thanks for any help
Cheers
Chris