Do I need a resistor for a DC motor?

Larger DC motors are seldom used for fixed speed operation, but electronic control or series resistance may be required just for starting a larger DC motor to avoid excessive starting current.

What is the use of resistor in DC motor?

For resistor applications used on DC series wound motors, the resistors are connected in line with the motor armature and field to reduce the voltage and current applied to the motor. The resistors will drop the starting voltage and current to the motor, therefore limiting the inrush current (torque) to the motor.

Can DC motor be connected in series?

You can not connect two dc series motors in series and as well as in parallel. Either you can connect them in series or in parallel. If you want both of the connections simultaneously you require 4 motors not two motors.

Does a motor need a resistor?

Motor Starting Resistors are used to reduce the voltage at the motor terminals and also decrease the starting current. Motor Starting Resistors are necessary because the self resistance of a motor armature is very low. When the voltage is first applied, excessive current will flow.

How do you control speed of DC motor?

Thus, the speed of a DC motor can control in three ways:

  1. By varying the flux, and by varying the current through field winding.
  2. By varying the armature voltage, and the armature resistance.
  3. Through the supply voltage.

How do you lower the RPM of a motor?

The load to be driven by the shaft will often require a different speed or torque or will require the transmission of power to an adjacent shaft. Reducing RPM can be accomplished by using two or more pulleys and belts to transmit and change the speed of rotation.

Is it better to wire motors in series or parallel?

A stepper motor may be wired in either series or parallel, depending on the needs of the application. A series-wired motor will deliver more stall torque, but torque drops quickly as velocity increases. A parallel-wired motor typically maintains its (lower-than-series) torque to a higher velocity.

How can you control the speed of a separately excited DC motor?

The speed of separately excited dc motor can be control by changing the armature voltage and changing field flux. Due to this the speed can be controlled for below rated speed and speed above the rated speed, respectively.