# Starting current of motor formula

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Example 11-4 Motor Solutions Using Efficiency 16 Lesson 11 332a.pptx A separately excited dc motor is rated at 100 HP, 600 V at 1200 rpm. The total armature resistance is 0.24 ohms. When the motor is delivering 75 HP at 1200 rpm its efficiency is 88%. At the 75 HP output find: a.) the motor armature current b.) counter emf (Ea)
1. MCB Current Calculation, OLR, Fuses and Cable size Calculations for 20 Hp Three phase (TP) Induction Motor. You can use this formula for any load, to choose MCB (Miniature circuit breaker), Fuses and Over Load Relay (OLR) calculation.
2. Starting Current in Induction Motor: Starting current of induction motor is as high as 5 to 7 times the normal full load current. Therefore different starting of induction motor, methods such as (star delta starter, auto transformer starter and other starting methods) are employed in order to reduce the high starting currents of induction motor. Why High Starting Currents:
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4. Full Load Current Calculator Parameters. Specify the phase-to-phase V LL voltage for a 3-phase AC supply in volts. Specify the the phase-to-neutral V LN voltage for a 1-phase AC or DC supply. Select the phase arrangement: 1 Phase AC, 3 phase AC, or DC. Load (S): Specify the the load in kW, kVA, A, or hp. And specify the load power factor ( pf ...
5. This equation allows us to calculate the stall (or starting) torque, by plugging in n = 0. This is the maximum torque the motor can generate. We can also calculate the stall current by dividing the stall torque by the motor constant (or, equivalently, by dividing v m by R). This is the maximum current the motor will draw.
6. Hence 1 HP Motor required 24.66 µF capacitance to start the motor smoothly. But in the market, you can get 25 µF. The voltage range for the capacitor should be 440V min. Example2: In the same way, let us take another example: Calculate starting capacitance for single phase 70 Watts, 220 V, 50 Hz, 85% efficiency fan.
7. By substituting equations 3. and 4. (torque and speed, section 2.1) into equation 2. (power, section 1.3 ), we see that the power curves for a D.C. motor with respect to both speed and torque are quadratics, as shown in equations 5. and 6. From these equations, we again find that maximum output power occurs at = ½, and = ½ repectively.
8. The torque developed in the dc motor changes when the device accelerates from zero to its maximum speed. The current and torque of the motor are increased when more load is induced in the motor. The value of the rotational mechanical power is divided by the value of the angular velocity is the dc motor speed formula.
9. Short answer. Stall current is the maximum current drawn 1, 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.. Free current is the current drawn when the motor is rotating freely at maximum speed, under no load 2 other than friction and back-emf forces in the motor itself.