When using any coupling component, it is advisable to analyze some factors of great relevance, such as using appropriate tools and devices to enable assembly and disassembly of the couplings, and to prevent possible damages to the electric motor .
Direct coupling has some advantages, has a much lower cost, greater safety against any type of accident and still takes up less space. The maximum loads and speed limits set out in the manufacturer’s, couplings and electric motor catalogs can not be exceeded. It is necessary to level and align the motor.
Functional engines that do not have coupled transmission elements must have their key fixed securely or removed in order to act to prevent accidents. It is important that flexible couplings, which have the capacity to absorb minimum misalignments during the device intervention, are applied.
In this way, the couplings are very useful in transmitting the torque from the motor to the driven machine. The direct coupling can be connected at the exact instant in which the motor shaft is coupled directly to the axis of the driven load, without the need of using any transmission element.
Brushes, commutator ring, stator and rotor are the components that form electric motors of direct current. The rotor is the rotating part of the motor, cogged on the axis of the machine, produced from ferromagnetic material wrapped in a winding called armature winding and in a commutator ring.
The brush is a part of graphite responsible for transporting energy to the rotor circuit. The commutator ring has the function of making the proper reversal of the direction of the currents passing in the armature winding, made by a ring of conductive material, segmented by an insulating material so as to close the circuit between each of the coils of the armature winding and the brushes at the right time.
The stator is the static part of the machine, armed around the rotor, so that it can rotate. This category of machine is also made of ferromagnetic material, wrapped in a low power winding that aims to cause a fixed magnetic field for the interaction with the field of the armature. ZD18H503-E
In some engines found on the market, they have compensating windings that balance the demagnetizing effect of the armature reaction and switching windings.
The maximum temperature that the thermal insulation components of the electric motor can withstand is computed to ensure a skilled operation in an environment with a temperature of approximately 40 ° C. A voltage drop can limit the flow of the magnetic circuit, resulting in reduced iron losses and the no-load current.
However, the motor torque must exceed the resistant torque, preventing excessive slippage. As the motor torque is a function of the product between the flow and the intensity of the absorbed current, if the flux decreases, the current intensity increases automatically.
With the current under high load due to the voltage drop, the motor must warm up and may increase the losses. An increase in supply voltage will have more limited effects, as the vacuum current expands, while the under load current smoothes.
It is therefore important to check and control the ambient temperature so that it does not pass the determined values for which the engine has been schematized. It is important to exercise caution regarding voltage variations. The thermal equilibrium of an engine is changed at the instant the supply voltage changes.