Why DC series motor should not be started on no-load ?

A DC series motor is a type of electric motor that operates on direct current (DC) and has its field windings connected in series with its armature windings. This type of motor is characterized by a high starting torque and a low speed, making it well-suited for applications that require a lot of torque at low speeds, such as in elevators and hoists.

One of the key characteristics of a DC series motor is that it is designed to be started with a load. This means that it should not be started without a load attached to the shaft. The reasons why a DC series motor should not be started without a load. First, as mentioned above, a DC series motor has a very high starting torque, which means that it can develop a lot of force when it is first started. DC series motor has a relatively low speed when it is running under load. This means that when the motor is started without a load the motor will accelerate to its maximum speed very quickly and spin at a very high speed, potentially damaging the motor.

Third, starting a DC series motor without a load can cause the motor to draw a very large amount of current from the power supply, potentially causing a power surge or damaging the power supply.

Overall, it is important to remember that a DC series motor should always be started with a load attached to the shaft, and should not be started without a load. This will help to prevent damage to the motor and the power supply and will ensure that the motor operates safely and efficiently.