What effect will high starting current in a DC motor have in a circuit?

very high starting torque will be produced (as torque is directly proportional to the armature current), and this high starting torque may cause huge centrifugal force which may throw off the armature winding. other loads connected to the same source may experience a dip in the terminal voltage.

Why is motor starting current high?

This high current in the rotor will create its own magnetic field which opposes the main stator magnetic field, this weakens the stator magnetic field so the back EMF in the stator will drop and the supply voltage will be much higher than the stator back EMF and so the supply current increases to a high value.

Why the starting current is high when there is no starter has been used?

Answer: The starting current is high as there is no back EMF or counter EMF present in the armature circuit because atstarting counter EMF is zero. It’s armature has very less resistance due to this it need more current at starting time. Hence DC starters are used to limit the starting current ofmotor.

What is the starting current of a motor?

Starting current is the current required to start a motor from stand-still condition. It is essential that a high current is required for producing starting torque. Generally starting current is 6 – 8 times FLC (full load current). This data is essential for selecting rating of Circuit Breaker or Fuses.

How does high voltage affect current?

Ohm’s law states that the electrical current (I) flowing in an circuit is proportional to the voltage (V) and inversely proportional to the resistance (R). Therefore, if the voltage is increased, the current will increase provided the resistance of the circuit does not change.

How does a motor affect current?

If a motor is running at a certain speed with a constant torque and the load increases, the current will increase and so also the torque to maintain the same speed. To be a little more precise there is a small voltage loss in the motor that does not contribute to the speed.

Why does my starter not rise?

Sourdough Starter Baking Questions Your sourdough starter should be rising predictably and on regular feeding schedule. If your starter is barely rising between feedings or taking a significantly long period to peak using a high feeding ratio (1:1:1), it is most likely not strong enough to naturally leaven bread.

Why starting current of a motor is kept low?

For the best motor performance, armature resistance in DC motors is kept very low (typically less than 1 ohm). This gives a starting current (Ia) of 550 amps, which can be more than ten times the rated current, and high enough to damage the internal motor circuit.

Why high voltage does not mean high current?

High voltages do not equal high currents. Voltage and current move inversely to each other. Higher voltage means lower current, and vice-versa.

Why does high voltage mean less current?

The primary reason that power is transmitted at high voltages is to increase efficiency. The higher the voltage, the lower the current. The lower the current, the lower the resistance losses in the conductors. And when resistance losses are low, energy losses are low also.

Why does current decrease in a motor?

To maintain ampere turn balance, a proportional high current (7-10 times the normal current) flows in the stator, which is starting current. As the motor picks up speed, relative speed between field and rotor decreases. Therefore rotor emf decreases and hence currents in rotor and stator also decrease.