Bar rotor

In motors, the rotor is made of conductive material rods that are located around the set of rotor plates, short-circuited by metal rings at the ends. The rotor core is composed of silicon steel plates and has axial channels on all machines. In line H and M, in the smaller carcases, deublin 1115-000-001 the package is continuous without radiating ventilation channels. In line M, larger housings, the plate is removed, forming the radial ventilation channels, which guarantees high thermal dissipation. The active part or conductors may be copper or brass rods.

Particular attention is given to preventing fatigue in the bars caused by vibrations. After placing the bars in the grooves, the short-circuit ring is welded through silver welding, ensuring perfect electrical connection between the parts. Further, the bar rotors may have various bar shapes with varying bar profile dimensions. These vast combinations allow a vast control of the electrical parameters of the electric motor as the maximum and starting torque, efficiency, power factor and starting current, among others.

Fundamentals of Engines

In electric motors we find two main parts, one of which is fixed, does not move when it starts, and another that generally rotates around an axis when the motor is turned on. The fixed part consists of copper wires, covered with a transparent material forming two coils. Already in the part fixed to the axis, the copper wires are rolled around the axis. The observation of the movable part of a blender  generac generators motor shows that it also has a metal cylinder formed of small copper plates separated from one another by grooves with the function of electrically insulating one plate from the other.

The electric circuit of the moving part is formed by several pieces of independent copper wire. When the electric motor is put into operation, there is an electric current in the fixed coils and also in the electric circuit fixed to the shaft and in contact with the coals. At that moment, the axis circuit is subjected to a force and it turns it, and another circuit is connected, repeating the previous procedure. The result is the complete rotation of the shaft, peculiar to electric motors.


In the demagnetization of an electric motor of direct current, the permanent magnets used to create the field on which its operation is based are not permanent, losing its magnetism over time. Another important factor is the current that flows through the windings.

All bodies tend to vibrate with greater intensity at certain frequencies and this holds true for the mechanical parts of an electric motor RSS35. A DC motor when rotating freely, without load, tends to accommodate itself in a rotation in which its mechanical parts hesitate in the resonant frequency, which can cause efforts that affect the integrity of the motor and its yield. What should be done is to employ parts that have different resonant frequencies and turn the other way around to override this effect.

The magnetic field created by the windings acts on the permanent magnet and over time causes its magnetism to decrease to the point where it begins to affect the efficiency of the motor. It is important to note that the current intensity above the value in the motor windings can create a very intense field to completely demagnetize the permanent magnets. Thus, pulses of intense currents should be avoided.

DC Motor Switching

The switching of the electric motor of direct current can be with or without brushes (brushless), each one offering specific advantages. Brushless switching is the most efficient because it requires less maintenance, generates less noise and has greater power density and speed range compared to the brushed switching motor. In fact the electronic system of brushless motors generally contributes to its cost of acquisition, which also has greater complexity and greater environmental limitations.

Brushed electric motors use contact brushes that connect to the commutator to power the rotor. The brushed construction is less expensive than the brushless motor and the control is simpler and cheaper . Another feature is that it can operate in extreme environments due to the internal absence of electronic components, but on the other hand, these motors require periodic maintenance to replace the worn brushes.

Brushless or brushless electric motors use a permanent magnet incorporated into the rotor assembly. These motors are similar to AC motors but are switched electronically so that they can be fed in direct current.


The electric current during the starting of an electric motor can change from 5 to 8 times the nominal current value. According to the ordinance of the National Agency of Electric Energy, each match has high powers for its use. We describe below:

The direct start is up to 15 CV and the chain current is much smaller than the starting line; Starting without load – The motor is connected directly to the mains via contactor and protective devices; Star / Triangle start – 15CV to 30CV and motor must have at least 6 accessible terminals. The motor Hubbell Wiring mrosupply starts at star and when it reaches the speed close to the nominal, the connection changes to triangle. The starting current and the torque are reduced to 1/3 of their nominal values; The start with Compensating Key is combined by a multi-lead autotransformer to regulate the starting process. Used in motors of high power; The starting with Soft Stater is the Start with reduced tension. It does not change the motor connections. Adjustable starting current. Correct starting torque and possibility of smooth stop; The frequency inverter is above 30CV and it is possible to set the start time and soft stop; The rheostat start in motors with coiled rotor is for any power.

Servomotor CA

We will talk in this text about the operation of the synchronous servo motors of permanent magnets of alternating current, therefore we will clarify an orientation on its operation. When talking about construction, the three-phase permanent magnet servo motor (STIP) is in its entirety similar to a permanent magnet synchronous electric motor. Its stator consists of a packet of magnetic plates separated from each other, having grooves (Semi-Closed) that accommodate the three-phase copper windings 22222 e/c3, and may also be made of aluminum.

The rotor I consists of a pack of magnetic plates and on its surface are installed the permanent magnets, which are normally Neodymium-Ferro-Boron (NdFeB) and so that the servomotor can comply with its role of precision motor is essential that it integrates a system that allows the detection of the position of its rotor. Subsequently, the data related to the position of your rotor will be sent to a control system, which will cover the decision to take, ie insert more current, reduce the current, among other control options, to ensure a torque for a wide range of speeds.

The Characteristics of Servomotor

The main characteristics of the servomotor are smooth rotation, high dynamic, low noise and vibration, motor output torque almost proportional to the applied voltage and direction of the torque determined by the instantaneous polarity of the control voltage. The most commonly used type of servomotor is the servo motor powered from an alternating power supply. In this configuration the rotor generally uses permanent magnets, usually made of rare earths. The housing is made of aluminum, the stator consists of a packet of blades and a sensor called encoder and resolver and is responsible for providing feedback signals to the servo inverter.

VM3538 .5HP 1725RPM

Through these signals the converter is able to precisely actuate the servomotor. The resolver sensor is a type of rotary transformer, where an alternating electrical signal is applied to the primary of this rotary transformer and in the two output windings, an alternating signal induced according to Faraday’s induction law allows to obtain the speed and position of the transformer rotor shaft. The output signal from the resolver is an analog signal. The output signal of an encoder is a digital signal. Servomotors can be classified as direct current servomotor and alternating current servomotor.

Variation of the speed of a motor

The speed of an electric motor of direct current will depend on the intensity of the magnetic field, the value of the applied voltage and the load. If the field strength decreases, the speed increases, trying to maintain the force against electromotive force. If the field winding were to open, only residual magnetism would remain, and the speed would increase in a dangerous manner, trying to maintain the electromotive force necessary to oppose the applied voltage. With a light load or even no load, an open field circuit could cause a speed rise in such a way that the engine would shatter. The blade of the commutator and other parts of the machine would be thrown away and could cause serious injury to persons near the machine baldor VEM3709T-5 7.5HP.

The motor speed can be controlled by controlling the field current using a rheostat or by controlling the applied voltage using static converters. If an AC voltage source, for example, is rectified, it can be used to convert a fixed alternating power supply into a variable continuous power supply. By modifying the voltage applied to the DC electric motor, it is possible to vary the speed of rotation thereof.


The speed of a DC motor will depend on the strength of the magnetic field, the value of the applied voltage and the load. If the field strength falls, the speed increases, trying to maintain the force against electromotive force. If the field winding were left open, only the residual magnetism would remain, and the velocity would increase in an alarming way, trying to counteract the applied voltage. With a light or no load, an open field circuit could cause an increase in speed that would shatter the engine. The commutator blades and other parts of the machine would be thrown away and could cause serious injury to operators near the machine.

The motor speed can be controlled by controlling the field current using a rheostat or by controlling the applied voltage by applying static converters. If a power supply is rectified, it can be used to convert a fixed alternating power supply into a continuous variable. Through this variation applied to the DC motor, it is possible to vary the speed of rotation of the same. The static converter is well used to perform this speed control by employing rectifiers to correct AC voltage and vary the DC voltage applied to the motor.

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