The formula for speed for induction motor is Ns=120f/p. from this formula we can conclude that the speed of the motor can be varied in two ways, one is by changing the number of poles and the second method is by changing the frequency. The speed control through the first method is ...
The angular velocity w of a motor is given by the following equation (the prime sign stands for time differentiation): (9.1)x′=T−LI, where T is the torque (Nm), L is the mechanical load (Nm), and I is the moment of inertia of the rotor (kg m2). The formula for T used in...
The paper presents a fundamentally new version of the mathematical description of the torque-speed curve of an induction motor with a power trigonometric function. This mathematical description is an alternative to the Kloss's formula and becomes possible when the uniform coordinate axis s is transfor...
Ns here stands for synchronous motor speed and as evident by the formula, it depends on two factors: Frequency (f) We know that an AC supply system has a particular frequency. The frequency indicates the number of times the rotating magnetic field rotates inside the armature. In the US, th...
Robust Control of Induction Motor with H ∞ Theory based on Loopshaping The approach, adopted in this paper, is based on loop shaping using a normalized coprime factor combined with a field-oriented control to control induction... H Benderradji,L Chrifi-Alaoui,S Mahieddine-Mahmoud,... - ...
Sometimes the compressor manufacturer will provide polytropic head or differential pressure instead of the discharge pressure. The below formula is used to calculate the polytropic head. Sign in to download full-size image 1) Represents the 100% speed (also called rated speed) of the curve and th...
motor type pre-induction/asynchronous Post permanent magnet/Synchronize Total motor power (kW) 168 Total Motor Torque (N·m) 390 electric motor(Ps) 228 The maximum power of the front motor (kW) 150 The maximum power of th...
Mezani et al. [22] presented a coupling model to describe the electromagnetic and thermal phenomena of an induction motor, in which the thermal analysis was conducted using the thermal network method. Although these studies explained the analysis process of the thermal network method in detail, it...
Because of the overlap between Pelton wheels and Francis turbines, the choice of machine type for a given combination of head and flow becomes too complicated to be expressed by a simple formula. Instead, the reader is referred to Figure 26.33 which demonstrates the design trends. Sign in to ...
Z_load is the impedance of the load (in this case, the motor) Z_source is the impedance of the source (in this case, the VFD) The formula for the voltage amplification factor: V_max = 1 + |R| where: V_max represents the maximum voltage on the line ...