Brushless dc motor is composed of main body of the motor and drive, is a typical mechatronics product. Because of brushless dc motor based on automatic running, so will not like the synchronous motor frequency control of motor speed under overload start plus startup winding on the rotor, also won't generate oscillation and step out when load mutation. Medium and small capacity of the permanent magnet brushless dc motor (BLDCM), now many high magnetic energy levels of rare earth ndfeb material. How to increase power brushless motor speed constant, torque must be increased, which is decided the rotor's diameter is constant, only lengthen the stator and rotor (Magnet steel)。 If you don't consider speed, single, from the perspective of 'more power', the only way is to change the motor a logarithmic (Premise condition is extremely extremely is greater than the number itself), power can improve a lot,Double or even improving)。 Pole to pole electrical, power can be improved about double pole to pole motor, electrical power about improving /, if itself is two pole motor, it is no way out. This is the transformation of the motor is the most commonly used way! But the price is higher, need to transform the stator winding. The characteristics of the brushless motor brushless motor is a kind of ac motor, that is to say, it's three cable transmission is the phase difference for the degree of three-phase alternating current. Brushless motor, when you buy consider two parameters: the size and KV. KV is decided by the several parameters: only on the stator coil number of turns and series. The coil and the thickness, size doesn't matter. The motor size, such as the familiar or, more said one size. The meaning of the size of the motor, the stator can around how many copper. Motor extremely simple. The same motor, the more you round copper, the greater the power of it. The same KV motor, for example, the same number of turns. Some motor with copper wire is thinner, its power was low. Some relatively coarse, its power is large. The more well known copper wire are round, thick line is low efficiency, the consequences of would you fail because of the gap. So some motor through the many strands of thin thread can increase on the amount of copper wire. But the real power of a motor, it itself is not important, and depends on the load. Motor around most of the match is a electric adjustable, this understandable. If the XXD this kind of motor power words, actually a used to maintain power is enough. But one thing is that if your electrical modulation is a biggest, at startup, motor load is considerable. Imagine, motor speed, but is expected to speed the RPM, the moment motor almost to the peak power. Although time is short, a electric will not what happened, but it is super, unsafe. If your electric slag adjust itself, is a tragedy. So call to a still is a good choice. Mentioned motor, just stay out of the cell. (Science: c number refers to the current relative to the size of the battery. For a battery of x mah, number c is the meaning of n is x * n/amps)Number of battery c is the bigger the better, but the large number of c cells prohibitively expensive. If the calculated according to the number of c above, will find mah, c of the discharge of the battery has reached a, almost don't need more at this level. Why will appear such as tp c batteries? Is it necessary? There are! Discharge c number represents the discharge capacity of a battery, the battery discharge, on the one hand, current, on the other hand the battery voltage will be smaller. Such as said just now mah, c battery, an s,. V, full electric voltage. V, for example. It at the time of a discharge, the voltage dropped to almost half of the original voltage, v. So c for this thing, if the battery can afford, or the bigger the better. Keeping the external part of the call of the stator, it contains two or more permanent magnetic pole. And rotating the middle part of the rotor, the rotor is composed of winding and connected with the commutator. Winding of the rotor pole and stator permanent magnetic pole, on the other hand, opposite poles attract each other, make the rotor motion, until aligned with the stator permanent magnetic pole. When the rotor position just reached alignment, the joint of commutator brush, activate the next set of winding, continue to make motor sports. Which and the difference with the brush motor? As the name implies, brushless motor is no brush and commutator, can also be called without motor commutator. Brushless motor rotor stator is composed of multiple windings for the permanent magnet. Quite so the structure of the traditional dc motor to turn from inside to outside. Winding is connected to the control circuit, control circuit instead of a commutator, is responsible for the activation of the corresponding suitable winding. Winding individually activated according to the direction of rotation, attracted to activate the stator winding of magnetic pole of the rotor magnetic pole, the alignment position transformation. Brushless dc motor according to the number of stator winding configuration for single-phase and two-phase, three-phase. Among them the most widely used three-phase. So what is the advantage of the brushless motor? First of all, without brush and commutator, is limited to the traditional dc motor high speed large capacity motor development of several factors, such as commutation spark, the mechanical strength of the commutator and brush wear problem by changing the conditions of commutation method are well solved. No sliding contact also solved the problem of the commutation spark, make its can be used in explosive environment. Brushless structure and improve the efficiency of the motor itself has no excitation loss and loss of carbon brush, eliminating the multiple reduction consumption, comprehensive energy-saving rate can reach % ~ %. Second, can run for high power at low speed, can save the reducer direct drive big load; Excellent torque characteristics, medium and low speed torque performance is good, big start torque, small starting current; Stepless speed regulation, wide speed range, overload ability, etc. Again, turbulence shock resistance, low noise, little vibration, smooth operation, long service life.
