**Contents**show

## How much current does a 3V motor draw?

Approximate specifications at 3 V: free-run speed of 20,000 RPM, free-run current of **350 mA**, stall current of 4 A, stall torque of 55 gf-cm (0.75 oz-in).

## How many amps does a DC motor draw?

Full load amps in 120 and 240 volts DC motors

Motor Rating (hp) | Current (amps) | |
---|---|---|

120 V | 240 V | |

1 |
9.5 |
4.7 |

1 1/2 | 13.2 | 6.6 |

2 | 17 | 8.5 |

## How much power does a DC motor consume?

Typical DC motors may operate on as **few as 1.5 Volts or up to 100 Volts or more**. Roboticists often use motors that operate on 6, 12, or 24 volts because most robots are battery powered, and batteries are typically available with these values. Operating Current.

## How do you calculate current in a DC motor?

Calculate the field current for the motor using the formula **I = V/R where** I is the field current. As an example, assume V is 40 volts and R is 500 ohms: I = 40/500 = 0.08 amps.

## How much current should a motor draw?

All motors are generators. Suppose your permanent-magnet-type DC motor generates 9V when the shaft is spun at, say, 100Hz or 6000RPM. This means that, when the motor is connected to a 9V battery, it will speed up to 6000RPM, then remain at that speed. When it’s up to 6000RPM, **it draws zero current** (ideally.)

## How much current will a motor draw?

Calculate the amps **used by dividing the wattage by the voltage**. For example a 500-watt motor — running on 50 volts — will draw 10 amps. A motor with the same wattage — running on 20 volts — will use 25 amps. This is the theoretical number of amps used by the motor.

## How do you calculate the power of a 12V DC motor?

If the DC motor is 12 v and has 3 amps, then is 36watts and a 12 volt battery on 75 amps/h will give you 12*75=**900watts**/36 = 25 hours.

## How does amperage affect a DC motor?

The current through the motor **times the resistance of the motor** creates a small voltage that must be subtracted from the applied voltage. As the load and current increase, this IR drop also increases causing the motor to lose a little speed.

## What is the working of DC motor?

A direct current (DC) motor is a type of electric machine that **converts electrical energy into mechanical energy**. DC motors take electrical power through direct current, and convert this energy into mechanical rotation.

## What is rating of DC motor?

Motors can commutate greater loads at low speed without damage. NEMA standards specify that dc machines must deliver **at least 150% rated current for 1 min at any speed within** rated range, but most motors do much better. Heating: Temperature is a function of ventilation and electrical/mechanical losses in the machine.

## Which battery is best for DC motor?

**7.2V: six AA or AAA rechargeable NiMh batteries** is perfect for 7.2V DC gear motors. These are usually in a battery pack rather than as individual cells and you will need a more specific NiMh battery pack charger. 7.4V: two LiPo cells can often power a microcontroller and works great for 7.2V DC gear motors.