How to drive a 115V 20A DC brushed motor with DC supply

In summary, the individual is seeking a way to drive a 115V DC brushed motor using a DC power supply. However, most drivers are designed for AC to DC and are not suitable for the 115V supply. They are asking for recommendations or suggestions on where to find a suitable driver for this setup. The motor and driver specifications include 115V, 20A (recommended 30A+ for current spikes), and 3.5 HP. They mention the option of using a bridge rectifier, but caution that the motor windings must not be internally tied to the frame unless an isolating transformer is used. They suggest a higher amp bridge rectifier, such as an 80 amp, and provide links to products and
  • #1
Daniel Sadlier
13
0
I am trying to drive a 115V DC brushed motor with a DC power supply. Most drivers I've found are for AC to DC and the 115V supply seems to be to much for most DC to DC.
Has anybody worked with driving motors with large DC power supplies? Or does anybody now where I might find one?

Thanks

The motor & driver specs are:

115V
20 A (driver should be 30A+ for current spikes)
3.5 HP
 
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  • #2
you can use a bridge rectifier if you're careful
but
be aware your motor windings must not be internally tied to the frame unless you use an isolating transformer.

a motor can draw several times rated current during start.

so i'd consider even this 35 amp bridge skimpy
though I've used them on 2hp motors...yours is almost twice that...
http://www.newark.com/fairchild-semiconductor/gbpc3506/bridge-rectifier-35a-600v-gbpc/dp/58K8890

at only $3 you can afford to destroy one
http://www.newark.com/productimages/standard/en_US/4076477.jpgI'd look for something like this 80 amp
http://www.newark.com/nte-electronics/nte5346/bridge-rectifier-single-phase/dp/31C4719
datasheet
http://www.nteinc.com/specs/5300to5399/pdf/nte5346_48.pdf
http://www.newark.com/productimages/standard/en_US/5060871.jpg
be aware your motor windings must not be internally tied to the frame unless you use an isolating transformer.
 
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Question 1: What is the recommended DC supply voltage for a 115V 20A DC brushed motor?

The recommended DC supply voltage for a 115V 20A DC brushed motor is 115V. This ensures that the motor receives enough power to operate at its intended capacity.

Question 2: Can I use a DC supply with a lower voltage to drive a 115V 20A DC brushed motor?

No, it is not recommended to use a DC supply with a lower voltage to drive a 115V 20A DC brushed motor. This can result in insufficient power supply to the motor, causing it to operate at a lower capacity and potentially damaging the motor in the long run.

Question 3: Is it safe to use a DC supply with a higher voltage to drive a 115V 20A DC brushed motor?

No, it is not safe to use a DC supply with a higher voltage to drive a 115V 20A DC brushed motor. This can cause the motor to overheat and potentially lead to electrical hazards or damage to the motor.

Question 4: What is the maximum allowable current for a 115V 20A DC brushed motor?

The maximum allowable current for a 115V 20A DC brushed motor is 20 amps. Exceeding this limit can cause the motor to overheat and potentially damage the motor or other components in the circuit.

Question 5: How do I properly connect the DC supply to a 115V 20A DC brushed motor?

You should follow the manufacturer's instructions for connecting the DC supply to a 115V 20A DC brushed motor. Generally, this involves identifying the positive and negative terminals on the motor and connecting them to the corresponding terminals on the DC supply using appropriate wires and connectors.

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