Contents
What is the stall current of a motor?
The stall current of a DC motor is how much current the motor will draw when power is applied but it is not spinning (for example, if the motor shaft is prevented from rotating), producing maximum torque and minimum (zero) speed.
What happens when an AC motor stalls?
In a simple definition, motor stalling means that the electric motor has more load on it than it is designed for and it can no longer supply enough torque to keep it spinning. In general this could happen at all types of motors. The torque increases as we are applying more power and the speed is decreasing.
What causes a 3 phase motor to stall?
Electrical stalling, especially in a 3 phase induction motor, typically is result of a single phase or missing phase condition. There is actually a speed zone where the motor torque and load curve are normally near one each other, this speed zone could become critical in case of voltage drops or load variations.
When does a motor have a stall current?
Short answer. Stall current is the maximum current drawn1, when the motor is applying its maximum torque, either because it is being prevented from moving entirely or because it can no longer accelerate given the load it is under.
Which is more important operating current or stall current?
Current is what powers the motor and too much current will damage the motor. For DC motors, operating and stall current are important. Operating current is the average amount of current the motor is expected to draw under typical torque. Stall current applies enough torque for the motor to run at stall speed, or 0RPM.
What should you consider when buying a motor?
What to consider when purchasing a motor: There are several characteristics that you need pay attention to when selecting a motor but voltage, current, torque, and velocity (RPM) are most important. Current is what powers the motor and too much current will damage the motor. For DC motors, operating and stall current are important.
What happens when there is no load on a motor?
At no load you have maximum speed and zero torque. Load adds mechanical resistance. The motor starts to consume more current to overcome this resistance and the speed decreases. If you increase the load at some point motor stops (this is called stall). When it occurs the torque is at maximum and it is called stall torque.