Stepper Motor BS2/sx control
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Posts: 46,084
Hi Everyone!
I am building an xy table using stepper motors. I currently
have 2 83 oz/in 1.25 amps/phase motors and a driver card
for them that can handle 2.0A per/phase.
I have built my own Unipolar stepper driver cards using
the UCN5804 Driver IC. And the ULN2803. These are great
and easily programmed thru Qbasic.
The reason I bought the Basic stamp BS2/sx was to be able to
store and run the program without having to have a pc and paralell
cable every I go.
My question is; I want to be able to run a big stepper from the
the BS2/sx chip. 1500-2400 oz/in with Amperage ratings from
5-10Amps. What kind of chip or circuit could I build that would
protect my stamp from over current? I really enjoy the programming
side of it and I know enough to get me in trouble on the hardware
side of it.
I appreciate all the help I can get. And Thank you in advance!
I am building an xy table using stepper motors. I currently
have 2 83 oz/in 1.25 amps/phase motors and a driver card
for them that can handle 2.0A per/phase.
I have built my own Unipolar stepper driver cards using
the UCN5804 Driver IC. And the ULN2803. These are great
and easily programmed thru Qbasic.
The reason I bought the Basic stamp BS2/sx was to be able to
store and run the program without having to have a pc and paralell
cable every I go.
My question is; I want to be able to run a big stepper from the
the BS2/sx chip. 1500-2400 oz/in with Amperage ratings from
5-10Amps. What kind of chip or circuit could I build that would
protect my stamp from over current? I really enjoy the programming
side of it and I know enough to get me in trouble on the hardware
side of it.
I appreciate all the help I can get. And Thank you in advance!
Comments
You must make sure the base current does not exceed the Stamps rating .
Original Message
From: <russell1@p...>
To: <basicstamps@egroups.com>
Sent: Tuesday, August 22, 2000 3:56 PM
Subject: [noparse][[/noparse]basicstamps] Stepper Motor BS2/sx control
> Hi Everyone!
> I am building an xy table using stepper motors. I currently
> have 2 83 oz/in 1.25 amps/phase motors and a driver card
> for them that can handle 2.0A per/phase.
>
> I have built my own Unipolar stepper driver cards using
> the UCN5804 Driver IC. And the ULN2803. These are great
> and easily programmed thru Qbasic.
>
> The reason I bought the Basic stamp BS2/sx was to be able to
> store and run the program without having to have a pc and paralell
> cable every I go.
>
> My question is; I want to be able to run a big stepper from the
> the BS2/sx chip. 1500-2400 oz/in with Amperage ratings from
> 5-10Amps. What kind of chip or circuit could I build that would
> protect my stamp from over current? I really enjoy the programming
> side of it and I know enough to get me in trouble on the hardware
> side of it.
>
> I appreciate all the help I can get. And Thank you in advance!
>
>
>
>
>
If your motor is unipolar, it is easy to drive steppers with IRL530N
mosfets. They are logic level input gate drive, which means they can be
driven directly from a Stamp.
on resistance=0.1 ohms.
n-channel, 15 amp, 100 volts.
I use a 1k to 10k resistor between the gate and Stamp, 1/16 to 1/8 watt.
This inhibits mosfet oscillation and provides some protection to the Stamp
if the mosfet fails. You can get further protection by using 2 clamp diodes
on the Stamp pin, one to +5v, the other to gnd.
Good luck,
Ray McArthur
Original Message
From: <russell1@p...>
To: <basicstamps@egroups.com>
Sent: Tuesday, August 22, 2000 1:56 AM
Subject: [noparse][[/noparse]basicstamps] Stepper Motor BS2/sx control
>
> My question is; I want to be able to run a big stepper from the
> the BS2/sx chip. 1500-2400 oz/in with Amperage ratings from
> 5-10Amps. What kind of chip or circuit could I build that would
> protect my stamp from over current? I really enjoy the programming
> side of it and I know enough to get me in trouble on the hardware
> side of it.
I take it the diodes would be between the resistor(i.e. the resistor between
the stamp and MOSFET) and the MOSFET.
So, would the banded end of the diode going to 5v would be oriented toward
the MOSFET, and the banded end of the diode going to ground would be
oriented toward ground?
Is there a book or other reference where you found out about the 1 to 10K
resistor between the MOSFET and the Stamp?
Mark
Original Message
From: rjmca <rjmca@w...>
To: basicstamps@egroups.com <basicstamps@egroups.com>
Date: Tuesday, August 22, 2000 1:13 PM
Subject: Re: [noparse][[/noparse]basicstamps] Stepper Motor BS2/sx control
>Russel:
>If your motor is unipolar, it is easy to drive steppers with IRL530N
>mosfets. They are logic level input gate drive, which means they can be
>driven directly from a Stamp.
>
>on resistance=0.1 ohms.
>n-channel, 15 amp, 100 volts.
>
>I use a 1k to 10k resistor between the gate and Stamp, 1/16 to 1/8 watt.
>This inhibits mosfet oscillation and provides some protection to the Stamp
>if the mosfet fails. You can get further protection by using 2 clamp
diodes
>on the Stamp pin, one to +5v, the other to gnd.
>
>Good luck,
>Ray McArthur
>
>
Original Message
>From: <russell1@p...>
>To: <basicstamps@egroups.com>
>Sent: Tuesday, August 22, 2000 1:56 AM
>Subject: [noparse][[/noparse]basicstamps] Stepper Motor BS2/sx control
>>
>> My question is; I want to be able to run a big stepper from the
>> the BS2/sx chip. 1500-2400 oz/in with Amperage ratings from
>> 5-10Amps. What kind of chip or circuit could I build that would
>> protect my stamp from over current? I really enjoy the programming
>> side of it and I know enough to get me in trouble on the hardware
>> side of it.
>
>
>
>
>
>
Connect one diode from the Stamp pin to +5V, band to +5. Connect the 2nd
diode from Stamp pin to gnd, band to Stamp pin. Both diodes would "point"
up. The idea is that if the mosfet melts down and applies drain voltage
back to the gate, the diodes would keep the Stamp pin voltage between ~0 and
~5 volts until the series resistor burns open circuit.
> Is there a book or other reference where you found out about the 1 to 10K
> resistor between the Mosfet and the Stamp?
There is probably discussion of this in app notes by International Rectifier
or other mosfet vendors. I found out about it in my working days when
mosfets were new, and we had devices oscillating at 300 MHz!! before
melting. In high power circuits switching at tens or hundreds of kHz, only
10 to 100 ohms is used to damp oscillations. For low speed circuits the
1k-10kohm provides more drive circuit protection. Mosfets have high input
capacitance, which, in conjunction with operating frequency, determines how
large the resistor can be.
Regards,
Ray McArthur
Original Message
From: techno_masai <plunkettm@e...>
To: <basicstamps@egroups.com>
Sent: Tuesday, August 22, 2000 9:30 PM
Subject: Re: [noparse][[/noparse]basicstamps] Stepper Motor BS2/sx control
> Hi Ray:
>
> I take it the diodes would be between the resistor(i.e. the resistor
between
> the stamp and MOSFET) and the MOSFET.
>
> So, would the banded end of the diode going to 5v would be oriented toward
> the MOSFET, and the banded end of the diode going to ground would be
> oriented toward ground?
>
>
> Mark
>
Original Message
> From: rjmca <rjmca@w...>
> To: basicstamps@egroups.com <basicstamps@egroups.com>
> Date: Tuesday, August 22, 2000 1:13 PM
> Subject: Re: [noparse][[/noparse]basicstamps] Stepper Motor BS2/sx control
>
>
> >Russel:
> >If your motor is unipolar, it is easy to drive steppers with IRL530N
> >mosfets. They are logic level input gate drive, which means they can be
> >driven directly from a Stamp.
> >
> >on resistance=0.1 ohms.
> >n-channel, 15 amp, 100 volts.
> >
> >I use a 1k to 10k resistor between the gate and Stamp, 1/16 to 1/8 watt.
> >This inhibits mosfet oscillation and provides some protection to the
Stamp
> >if the mosfet fails. You can get further protection by using 2 clamp
> diodes
> >on the Stamp pin, one to +5v, the other to gnd.