commutator (COMMUTATOR) is a permanent magnet DC series motor continues to rotate the motor in order to enable a primary component down. Structurally, the commutator contact piece is surrounded by several round, each tap are respectively connected to the rotor, connected to two outer electrodes called brushes in contact, while only two of which are in contact. The principle is that when the current through the coil, will be under the influence of the permanent magnet, by attracting and repulsive forces is rotated, and the magnet when it is balanced to original lines carrying electricity than the corresponding contact pads on the commutator and electrical Shuafen leave, in line with the brush connected to the set of coils to generate driving force corresponding to the contact pads, so that keep repeating it, to turn up a DC motor.
1. Works commutator
The working principle of the commutator of the armature winding is inductive alternating electromotive force generated by the action of the commutator with the brush commutation, so that when the end of the brush becomes principles drawn from the DC emf. On the principle of a DC motor can work as a motor from the basic electromagnetic operating situation and to be operated as a generator, but the only different constraint conditions.
In the direct current motorBrushes on both ends, with a DC voltage, the power input of the armature, the mechanical output from the motor shaft, the drag production machinery, converting electrical energy into mechanical energy and become the motor, the DC motor armature as drag prime mover, and without a DC voltage to the brush, the brush end may lead DC electromotive force as a DC power supply, the output power, the motor converts mechanical energy into electrical energy becomes a generator.
same motor, this principle can be operated as a generator or a motor. It referred to in principle reversible motor theory. Flow diverter is a key component in the flow rate affects the performance of the standard device, the error is one of the standard means constituting a main component of the error. By calculating the fluid velocity jets and dynamic analysis of the flow rate of the commutator, the commutator conventional flow to find the cause of error; error sources found for a method for reducing error to design a flow-way rotating commutator. .
Part 2 and commutator material characteristics
1, housing: high rigidity cast iron FC-25
2, gear: high-quality high purity 50CrMnT quenched alloy machining, carburizing quenching and finely ground
3, spindle: quality of high purity alloy 40Cr quenched processing, comprising hanging load carrying capacity
4 , bearing: equipped with a load carrying capacity of tapered roller bearings
5, seal: the use of imported oil seal lips, with a high dust-proof and anti-spill
3. Replace the commutator maintenance
1, the commutator selected imported car starter needs to be replaced due to burn the entire commutator must detect the outer diameter of the commutator, the hole diameter, length and number of slots copper and other parameters, and then choose to be absolutely equal to the number of these parameters similar Sui commutator and commutator to select a replacement clip.
2, replacement of the commutator step
(L). Test whether the armature winding and to ground short circuit phenomena, should be excluded in time, to avoid future trouble. .
(2) election pore diameter within hours commutator, turning on a lathe can be increased to achieve the required hole diameter of the armature shaft; when the large-diameter hole, workability a bush, and pressed it manhole.
(3). Commutator clip clips are generally slightly longer, which can cut off the excess part as needed, and in its opening and scraped along soldering.
(4) The connecting thread of the opening slightly commutator armature winding slots are aligned one by one, and then gradually press-fitted into the commutator on the armature shaft, commutator to a position to meet the requirements until.
(5) The commutator damage from scraping the lower step lug from the armature shaft in the vehicle or a stepped lug at hacksaw circumferential circle saw cutting off the commutator, unplug one by one and then scraped with a forceps connected to a thread hard soldering, and then remove the remaining portions of the commutator.