dc motor starting with high load
dc motor starting with high load
(OP)
I have a problem starting a 12v DC Motor
When I start it from my 12v DC line it drags the line down to 10 volts. But due to some voltage checking circuitry in the starter for the motor it stops the motor if the line drops below 12v.
Would I be right in assuming that if I placed a large enough Capacitor (1 farad) in parallel with the motor this would act to stop the line being dragged down & hence enable me to start the motor?
The motor runs a compressor so it is a high inertia load & I expect it to need an assisted start will this work?
When I start it from my 12v DC line it drags the line down to 10 volts. But due to some voltage checking circuitry in the starter for the motor it stops the motor if the line drops below 12v.
Would I be right in assuming that if I placed a large enough Capacitor (1 farad) in parallel with the motor this would act to stop the line being dragged down & hence enable me to start the motor?
The motor runs a compressor so it is a high inertia load & I expect it to need an assisted start will this work?





RE: dc motor starting with high load
RE: dc motor starting with high load
Placing a resistor in series with the armature during start will help. After the motor is running at a constant speed, short out the resistor.
As an alternative, an electronic DC motor controller can be used.
RE: dc motor starting with high load
capacitor though will not let the voltage fall but will be an added item which will keep on discharging to the armatature whenever motor is stopped.
RE: dc motor starting with high load
In reply to your question, yes, you could put a capacitor in parallel with the supply BEFORE the motor start circuit. The capacitor would then be charged before you start the motor and provided it is of sufficient capacity it would hold the voltage up during starting. As a rule of thumb you need about 1000 uf per amp.
Cheers,
G
RE: dc motor starting with high load
RE: dc motor starting with high load
I shall look into some of the suggestions.