I have a 24v DC motor that I'm using with a PWM controller supplied by a
24v SMPS. I want to be able to briefly switch the motor to 48v with a
relay.
bobenge...@gmail.com wrote:
===========================
I have a 24v DC motor that I'm using with a PWM controller supplied by a** Bad idea.
24v SMPS. I want to be able to briefly switch the motor to 48v with a
relay.
Doubling the DC input to a brush motor will quickly destroy it - it may last only a few minutes of such abuse.
Over voltage creates severe acing across the segments of the commutator.
A good rule is to have no more than 2.5V for each pole of a DC motor.
..... Phil
I have a 24v DC motor that I'm using with a PWM controller supplied by a
24v SMPS. I want to be able to briefly switch the motor to 48v with a relay. I don't have a 48v supply, but I do have a 24v transformer & bridge. I know that the following will give me the 48v,
that the Motor Control will be OK with it. But I'd like to know if I'm missing something. The relay will disconnect the Motor Control from the motor before connecting the 48v.
Thanks, Bob
___________________________ +48v
_________ | _________
| +|______________|______| Motor |_____
| 24vdc | |Control|
| SMPS | | | | -|_______________._____| |_____ Motor
|_______| | |_______|
|
_________ _________ |
| 24v |____| Full +|__|
|Xformer| | wave |
| | |bridge |
| |____| -|________________________________ |_______| |_______|
bobenge...@gmail.com wrote:
===========================
I have a 24v DC motor that I'm using with a PWM controller supplied by a
24v SMPS. I want to be able to briefly switch the motor to 48v with a
relay.
** Bad idea.
Doubling the DC input to a brush motor will quickly destroy it - it may last only a few minutes of such abuse.
Over voltage creates severe acing across the segments of the commutator.
A good rule is to have no more than 2.5V for each pole of a DC motor.
..... Phil
I have a 24v DC motor that I'm using with a PWM controller supplied by a >> 24v SMPS. I want to be able to briefly switch the motor to 48v with a
relay.
** Bad idea.
Doubling the DC input to a brush motor will quickly destroy it - it may last only a few minutes of such abuse.
Over voltage creates severe acing across the segments of the commutator.
A good rule is to have no more than 2.5V for each pole of a DC motor.
Phil thanks - I didn't know that. Nevertheless I'm going to proceed
with my arrangement:
- it's for my own use & not a customer's, nor a product
- the "briefly" is 5-10 seconds and a duty cycle of maybe 5-10%
- I have a few of these motors and if one is destroyed I'll use another
and have learned a lesson
Sysop: | Keyop |
---|---|
Location: | Huddersfield, West Yorkshire, UK |
Users: | 296 |
Nodes: | 16 (2 / 14) |
Uptime: | 78:30:14 |
Calls: | 6,658 |
Calls today: | 4 |
Files: | 12,203 |
Messages: | 5,332,975 |
Posted today: | 1 |