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en.wikipedia.org/wiki/Duty_cycle

A duty cycle or power cycle is the fraction of one period in which a signal or system is active. Duty cycle is commonly expressed as a percentage or a ratio. A period is the time it takes for a signal to complete an on-and-off cycle. As a formula, a duty cycle (%) may be expressed as: . = × %. Equally, a duty cycle (ratio) may be expressed as: . =. where is the duty cycle, is the pulse width ...

www.groschopp.com/duty-cycle-need-know

Continuous Duty During the hunt for an electric motor for a particular application, duty cycle is routinely brought up as an important factor in determining your final motor selection. Often asked is the question of, “Will this application require a continuous duty cycle or an intermittent one?” In other words, will the application be a […]

www.electrical4u.com/motor-duty-class

This motor duty class is widely used in metal cutting and drilling tool drives, mine hoist etc. Intermittent Periodic Duty with Starting and Braking In this type of drives, heat loss during starting and braking cannot be ignored.

myelectrical.com/notes/entryid/106/understanding-motor-duty-rating

As per S6, but with a significant starting and electric breaking periods. Again motor operates at no-load for period instead of stopped. S8: Continuous operation periodic duty with related load/speed changes: Series of identical repeating duty cycles, where within each cycle the motor operates at several different load levels and speed.

www.engineeringtoolbox.com/iec-duty-cucles-d_739.html

The eight - S1 - S8 - IEC duty cycles of operating electrical motors Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! - the most efficient way to navigate the Engineering ToolBox!

electrical-engineering-portal.com/10-duty-types-three-phase-asynchronous-motors

For a motor suitable to this duty type, the rating, for test purposes, at which the machine may be operated at constant load until thermal equilibrium is reached and which results in the same stator winding temperature rise as the average temperature rise during one load cycle of the specified duty type.

www.industrial-electronics.com/AC-DC-motors/28_duty-cycle.html

The duty cycle of a motor is the amount of time the motor can be operated out of every hour. If the motor’s duty cycle is listed as continuous, it means the motor can be run 24 hours a day and does not need to be turned off to cool down.

www.electricalengineering-book.com/pdf/chapter-865728.pdf

Duties of induction motors 3/63. Duties of induction motors3/65 3.1 Duty cycles Unless otherwise specified, the rating of the motor will ... to attain thermal equilibrium during one duty cycle (Figure 3.4). In this duty the motor is stopped, either by natural deceleration, after it has been disconnected from the supply source, or by mechanical ...

www.machinebuilding.net/ta/t0379.htm

Motor Technology Ltd offers the following advice relating to duty cycles for electric motors. The IEC (International Electrotechnical Commission) publishes IEC 60034-1, Rotating electrical machines - Part 1: Rating and performance, which contains classifications for duty cycles to describe a motor's operating conditions.It is vital to know the differences between these duty cycles and to note ...

learn.sparkfun.com/tutorials/pulse-width-modulation

A typical servo motor expects to be updated every 20 ms with a pulse between 1 ms and 2 ms, or in other words, between a 5 and 10% duty cycle on a 50 Hz waveform. With a 1.5 ms pulse, the servo motor will be at the natural 90 degree position.