The first, and simplest, type of motor duty cycle is continuous duty. This is also referred to by its abbreviated name, S1 duty (Figure 1). In this type of operation, the motor runs with a constant load for a long enough duration so that it reaches thermal equilibrium.
What does duty cycle S1 mean?
DEFINITION – The duty type S1 can be defined as operation at a constant load maintained for sufficient time to allow the machine to reach thermal equilibrium.
What does S1 mean on motor?
Understanding Motor Duty Rating
|S2||Short Time duty|
|S3||Intermittent periodic duty|
|S4||Intermittent periodic duty with starting|
|S5||Intermittent periodic duty with electric braking|
What is S1 and S2 in motors?
S1. Continuous duty. The motor works at a constant load for enough time to reach temperature equilibrium. S2. Short-time duty.
What is S2 duty motor?
According to this standard, S2 duty rating is short time duty: motors using this duty cycle adapt to constant load. Temperature rises fast during the operation and quickly reaches its limit. Motor needs long stop for total cooling between each start. S4 duty cycle is intermittent duty with starting.
What are the different classes of duty?
Motor Duty Class and its Classification
- Continuous duty.
- Short time duty.
- Intermittent periodic duty.
- Intermittent periodic duty with starting.
- Intermittent periodic duty with starting and braking.
- Continuous duty with intermittent periodic loading.
- Continuous duty with starting and braking.
What is air gap flux in induction motor?
The induction motor has a stator and the rotor as its major parts. … When the stator is connected to the three-phase supply source, the rotational magnetic field of constant magnitude and a varying direction is produced. The flux produced in the stator travels through the air gap and gets linked to the rotor conductors.
What is continuous duty?
The Regulation states that motors rated for continuous duty are covered. This means motors that are capable of continuous operation at their rated power with a temperature rise within the specified insulation temperature.
What is classes of motor duty?
continuous duty ii. short time duty iii. intermittent periodic duty iv.
What is intermittent duty?
Intermittent duty is when a motor or gear motor has a duty cycle that isn’t running continuously without any time of break. This could be 10 seconds on and 50 seconds off, 10 seconds on and 5 minutes off, or any other on-off combination.
What is CDF in motor?
2. Cyclic duration factor : (CDF) : The ratio between the period of loading including starting and electric braking and the duration of the duty-cycle expressed as percentage. 3. Starting : The process of energizing a motor to bring it upto rated speed from rest.
What is the meaning of duty cycle?
Duty cycle is the ratio of time a load or circuit is ON compared to the time the load or circuit is OFF. Duty cycle, sometimes called “duty factor,” is expressed as a percentage of ON time. A 60% duty cycle is a signal that is ON 60% of the time and OFF the other 40%.
What is duty cycle of DC motor?
Duty Cycle is the ratio of the full-power pulse’s duration to the entire PWM interval period, usually expressed as a percentage. … When a controller is sending the full voltage of the power source to the motor, the motor sees a PWM signal with a duty cycle of 100%.
What are the four types of motor torque?
The torque developed by an asynchronous induction motor varies when the motor accelerates from zero to maximum operating speed.
- Locked Rotor or Starting Torque. …
- Pull-up Torque. …
- Break-down Torque. …
- Full-load (Rated) Torque or Braking Torque. …
- NEMA Design. …
- Accelerating Torque. …
- Reduced Voltage Soft Starters.
What is the duty of electric motor?
The motor works at a constant load for enough time to reach temperature equilibrium. The motor works at a constant load, but not long enough to reach temperature equilibrium. The rest periods are long enough for the motor to reach ambient temperature.
Which braking method has highest braking torque?
Which braking method is the best method for obtaining high braking torque? Explanation: Plugging is the best braking method among all braking techniques. In plugging the value of the armature current reverses and the mechanical energy is extracted. A very high braking torque is produced in case of plugging.