What is meant by duty S1 in motors?
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 is S1 and S2 motor?
S1 Continuous duty: Operation at a constant load; the motor reaches thermal equilibrium. S2 Short-time duty: Operation at constant load for a given time followed by a time at rest. The motor returns to ambient temperature during the rest period.
What is the duty rating of a motor?
Time rating — Standard motors are rated for continuous duty (24/7) at their rated load and maximum ambient temperature. Specialized motors can be designed for “short-time” requirements where intermittent duty is all that’s needed. These motors can carry a short-time rating from 5 minutes to 60 minutes.
Which motor is used in tramway?
Dc motor (Ma) and induction motor (Mc) are currently manufactured and used in 105 N tram drive, their parameters are available. Dc motor (Mb), brushless motor (Me) and slip-ring motor (Md) pa- rameters have been determined by analysis.
What is 60 minute duty cycle?
Understanding the Constraints Motor on-time is defined as the period of time during which a motor is actually running. … A 60 minute rated motor is used. These motors are designed to withstand heat buildup and do not need cooling off time.
What is service factor of motor?
Motor service factor (SF) is the percentage multiplier that a motor can handle for short periods of time when operating within its normal voltage and frequency tolerance. In other words, it is a fudge factor that give extra horsepower when it’s occasionally needed.
Why DC motors are preferred over AC motors?
DC motors have the advantage of: higher starting torque, quick starting and stopping, reversing, variable speeds with voltage input and they are easier and cheaper to control than AC. AC motor advantages include: lower power demand on start and minimal maintenance.
How do I know if my motor is inverter duty rating?
Motor insulation systems that are rated for inverter use will be specified on the motor nameplate (or a sticker). These systems should have wire rated for a minimum of 1600 volt spikes, F or H class insulation, and will be processed with 100% sold resin in a vacuum pressure impregnation (VPI) system.