When the electric motor operates directly connected to the mains, that is, with a regular three-phase power supply, the sum of all the vectors corresponding to the phases is zero, the neutral being stationary and is usually maintained in the ground. For a given voltage, the characteristic curve of the motor will be fixed, independent of the load. Being connected directly to the electrical network will present a certain starting current peak, which normally presents its maximum value and that will cause a voltage drop in the network, interfering with the devices where they are connected. If so. Then the direct start must be replaced by another possible connection in order to reduce the starting current.
The connection types commonly used are serial-parallel connection, star-delta connection, static-start connection or electronic starter connection using a frequency inverter or variable speed drive CA32112 M. Frequency inverters have been increasingly used to control squirrel cage three-phase induction electric motors because of their efficiency and competence to regulate working speed as well as other parameters.
The basis of the operation of many appliances we use is the rotation that comes from the electric motors and sometimes this rotating movement is obvious, as in the cake mixers or fans, but usually remains well disguised, as in the washing machine agitators or in the movements of the electric windows of automobiles windows. Widely used in our daily lives, the motors range from small appliances such as blenders and shavers to large industrial engines capable of handling tons.
With the advance of the knowledge about the magnetic field induced by the electric current, an idea appeared that would end up revolutionizing the forms of generation of work and force. The use of some natural factors and others invented and improved by great scholars of our history arise what we call electric motor, the machine destined to transform electrical energy into mechanical energy. When we connect a motor to the power grid, it absorbs the amount of electrical energy needed to move and charge a load. The large variations reach the most diverse technical specifications, some of them being of high precision, controlled electronically by drives and inverters, used in robots and automation machines. https://www.mrosupply.com/hydraulics-and-pneumatics/hose-reels/hose-reel-parts/2793565_s19-260044_reelcraft/