Hi Jing,
Sorry that was a design choice on KSTEP in order to reduce the number of I/O required there is just one enable. Normally a system must be designed so that if a motor is used continuously it will not overheat anyway. You may need to reduce the current settings for your motors or add more heat sinking for them.
Regards TK
| Group: DynoMotion |
Message: 7265 |
From: Jing Zhang |
Date: 4/15/2013 |
| Subject: Re: Separate Enabling of Motors |
Hi, Tom,
For the current setting, could you give me some example as how to reduce the current settings? I have already limited the current to the minimum value with current setting jumpers.
Best
Jing
| Group: DynoMotion |
Message: 7266 |
From: Tom Kerekes |
Date: 4/15/2013 |
| Subject: Re: Separate Enabling of Motors |
Hi Jing, If you have removed all the jumpers that is the lowest setting. Your motors must be very small. What are their specs?
TK
| Group: DynoMotion |
Message: 7267 |
From: Jing Zhang |
Date: 4/15/2013 |
| Subject: Re: Separate Enabling of Motors |
Hi, Tom,
Yes, the motors are small. The motors I use are EAD LH1715-12. The phase voltage is 12 volts, and the phase current is 0.4 A, the phase resistance is 30 ohms.
Best
Jing
| Group: DynoMotion |
Message: 7268 |
From: Tom Kerekes |
Date: 4/15/2013 |
| Subject: Re: Separate Enabling of Motors |
Hi Jing,
The current rating is too small for KSTEP. If you chose a lower voltage motor winding option like the LH1715-M100 (1 Amp 4.7 ohms) it would work and you would get much higher speed and torque.
Regards TK
| Group: DynoMotion |
Message: 7270 |
From: Jing Zhang |
Date: 4/15/2013 |
| Subject: Re: Separate Enabling of Motors |
Hi, Tom,
That is true. I have the other motors already. Is there anything I can do with the small motors?
Best Jing
| Group: DynoMotion |
Message: 7272 |
From: Tom Kerekes |
Date: 4/15/2013 |
| Subject: Re: Separate Enabling of Motors |
Hi Jing, Not really without going to different stepper drives. Regards TK
| Group: DynoMotion |
Message: 7273 |
From: Jing Zhang |
Date: 4/15/2013 |
| Subject: Re: Separate Enabling of Motors |
Hi Tom,
Thanks. Is there anyway I can do PWM to reduce the current in those spare motors? best Jing
| Group: DynoMotion |
Message: 7274 |
From: Tom Kerekes |
Date: 4/15/2013 |
| Subject: Re: Separate Enabling of Motors |
Hi Jing,
Not really. To be honest we made a mistake when we designed KSTEP and used an opto coupler that was too slow for the Enable (and the Enable/Disable times are asymmetric). So the PWM frequency must be very low (<1KHz) which will result in an annoying sound and not work while moving.
I suppose you could add a dummy shunt inductive load to divert some of the current.
You should be able to replace these small motors very inexpensively. Here is a much better motor for $20:
http://www.kelinginc.net/NEMA17Motor.html
Regards TK
| Group: DynoMotion |
Message: 7275 |
From: Jing Zhang |
Date: 4/15/2013 |
| Subject: Re: Separate Enabling of Motors |
Hi, Tom,
Thanks a lot for your suggestion. Best
Jing
| Group: DynoMotion |
Message: 7276 |
From: tmday7 |
Date: 4/15/2013 |
| Subject: Re: Separate Enabling of Motors |
Kelings new website has a little better price, if that helps.
http://www.automationtechnologiesinc.com/products-page/nema-17
Troy
.
>
>
> You should be able to replace these small motors very inexpensively. Here is a much better motor for $20:
>
> http://www.kelinginc.net/NEMA17Motor.html
>
> Regards
> TK
>
>
> ________________________________
> From: Jing Zhang <jing_usc@...>
> To: "DynoMotion@yahoogroups.com" <DynoMotion@yahoogroups.com>
> Sent: Monday, April 15, 2013 4:41 PM
> Subject: Re: [DynoMotion] Separate Enabling of Motors
>
>
>
> Â
> Hi Tom,
>
> Thanks.
> Is there anyway I can do PWM to reduce the current in those spare motors?
> best
> Jing
>
>
> ________________________________
> From: Tom Kerekes <tk@...>
> To: "DynoMotion@yahoogroups.com" <DynoMotion@yahoogroups.com>
> Sent: Monday, April 15, 2013 4:36 PM
> Subject: Re: [DynoMotion] Separate Enabling of Motors
>
>
>
> Â
> Hi Jing,
>
> Not really without going to different stepper drives.
>
> Regards
> TK
>
>
>
>
> ________________________________
> From: Jing Zhang <jing_usc@...>
> To: "DynoMotion@yahoogroups.com" <DynoMotion@yahoogroups.com>
> Sent: Monday, April 15, 2013 4:23 PM
> Subject: Re: [DynoMotion] Separate Enabling of Motors
>
>
>
> Â
> Hi, Tom,
>
> That is true. I have the other motors already. Is there anything I can do with the small motors?
>
> Best
> Jing
>
>
> ________________________________
> From: Tom Kerekes <tk@...>
> To: "DynoMotion@yahoogroups.com" <DynoMotion@yahoogroups.com>
> Sent: Monday, April 15, 2013 3:48 PM
> Subject: Re: [DynoMotion] Separate Enabling of Motors
>
>
>
> Â
> Hi Jing,
>
> The current rating is too small for KSTEP. If you chose a lower voltage motor winding option like the LH1715-M100 (1 Amp 4.7 ohms) it would work and you would get much higher speed and torque.
>
> Regards
> TK
>
>
> ________________________________
> From: Jing Zhang <jing_usc@...>
> To: "DynoMotion@yahoogroups.com" <DynoMotion@yahoogroups.com>
> Sent: Monday, April 15, 2013 3:12 PM
> Subject: Re: [DynoMotion] Separate Enabling of Motors
>
>
>
> Â
> Hi, Tom,
>
> Yes, the motors are small.
> The motors I use are EAD LH1715-12. The phase voltage is 12 volts, and the phase current is 0.4 A, the phase resistance is 30 ohms.
>
> Best
>
> Jing
>
>
> ________________________________
> From: Tom Kerekes <tk@...>
> To: "DynoMotion@yahoogroups.com" <DynoMotion@yahoogroups.com>
> Sent: Monday, April 15, 2013 3:06 PM
> Subject: Re: [DynoMotion] Separate Enabling of Motors
>
>
>
> Â
> Hi Jing,
>
> If you have removed all the jumpers that is the lowest setting. Your motors must be very small. What are their specs?Â
>
>
> TK
>
>
>
> ________________________________
> From: Jing Zhang <jing_usc@...>
> To: "DynoMotion@yahoogroups.com" <DynoMotion@yahoogroups.com>
> Sent: Monday, April 15, 2013 2:44 PM
> Subject: Re: [DynoMotion] Separate Enabling of Motors
>
>
>
> Â
> Hi, Tom,
>
> For the current setting, could you give me some example as how to reduce the current settings? I have already limited the current to the minimum value with current setting jumpers.
>
> Best
>
> Jing
>
>
> ________________________________
> From: Tom Kerekes <tk@...>
> To: "DynoMotion@yahoogroups.com" <DynoMotion@yahoogroups.com>
> Sent: Monday, April 15, 2013 11:59 AM
> Subject: Re: [DynoMotion] Separate Enabling of Motors
>
>
>
> Â
> Hi Jing,
>
> Sorry that was a design choice on KSTEP in order to reduce the number of I/O required there is just one enable. Normally a system must be designed so that if a motor is used continuously it will not overheat anyway. You may need to reduce the current settings for your motors or add more heat sinking for them.
>
> Regards
> TK
>
>
> ________________________________
> From: Jing Zhang <jing_usc@...>
> To: "DynoMotion@yahoogroups.com" <DynoMotion@yahoogroups.com>
> Sent: Monday, April 15, 2013 11:20 AM
> Subject: [DynoMotion] Separate Enabling of Motors
>
>
>
> Â
> Hi, Tom,
>
> I am using a combination of KFlop+KStep, and I find that once one motor is enabled to work, the other three motors have voltage on.Â
> If I use one motor for a longer time, the other three motors have the trouble of overheating. How could I just enable the motor which needs to work?
>
> Best
>
> Jing
> |
|
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