# Quick Answer: What is duty factor of a motor?

Contents

## What is meant by duty S1 in motor?

(Figure 1) Motor Duty Cycle #1 – Continuous Duty. 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 is S1 and S2 duty motor?

Understanding Motor Duty Rating

S1 Continuous duty
S2 Short Time duty
S3 Intermittent periodic duty
S4 Intermittent periodic duty with starting
S5 Intermittent periodic duty with electric braking

## What is S9 duty motor?

S9. The duty type S9 is defined as a duty in which generally load and speed vary non-periodically within the permissible operating range. This duty includes frequently appplied overloads which may greatly exceed the reference load.

## How do you find the duty cycle on a motor?

Duty cycle is the ratio of time the motor produces rated power divided by the total elapsed time.

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## What is S5 duty?

DEFINITION – The duty type S5 is defined as a sequence of identical duty cycles, each cycle consisting of a starting time, a time of operation at constant load, a time of electric braking and a time de-energized and at a rest.

## What is load 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 the duty cycle of a welder?

Duty cycle is the percentage of time that a machine will safely operate (or weld), within a certain time period, at a given amperage. For example the Weldforce WF-205MST multi-function welder has a duty cycle of 200 Amps @ 30%. This means that it will operate at 200A for 3 minutes within a 10 minute time period.

## 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 starting and braking.

## What is duty cycle in 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. PWM Equivalent Voltage is the product of the power supply voltage times the Duty Cycle divided by 100.

## How is duty cycle calculated?

Duty Cycle = Pulse Width (sec) * Repetition Frequency (Hz) * 100.

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## 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 formula for duty ratio?

Determine the duty cycle, represented by “D,” through the formula D = PW/T. As an example, if PW is 0.02 seconds and T is 0.05 seconds, then D = 0.02/0.05 = 0.4, or 40%.

## What is duty cycle in VFD?

By duty cycle we mean the time distribution between continuous current requirement and overload requirement during the normal operation of the VFD. If you are selecting a VFD for a squared torque application, then you could select a lightly duty variable frequency drive.