Brushless dc motor overview installation with permanent magnetic brushless dc motor rotor, and the stator has at least two winding. When the rotor magnetic consistent with the stator winding, will drive the second winding. Two winding open and shut alternately, this will lead to lock in want of brushless dc motor position. Through the winding direction of current can also reverse. in the stator winding of the brushless dc motor with two, four brushless dc 90 & deg; Separated. According to provide to the stator winding of the pulse can be precisely controlled brushless dc brushless dc motor movement. Brushless dc motor speed control can be achieved by offering winding pulse frequency, and direction of rotation can be change by reverse pulse sequence. Motor internal sheet has many teeth, will help you in positioning the rotor position relative to the stator. Some level of brushless dc motor stator teeth. According to the use of control technology, which can full brushless dc, half brushless dc or micro brushless dc brushless dc motor control. Simple square pulse can be controlled in full of brushless dc motor, and advanced control technology (Such as pulse width modulation (脉宽调制)）Can be used in micro brushless dc. in the domestic, the masses of users to & other; Subdivision & throughout; Is not particularly understand, some just think, subdivision is in order to improve the accuracy, actually otherwise, segmentation mainly is to improve the performance of the motor, the instructions are as follows: control of brushless dc motor is precisely controlled by the driver of brushless dc motor phase current, the two-phase motor, for example, if the rated current of motor is 3 a, if you are using a conventional drives (Such as commonly used way of constant current chopper)Every step driving the motor, the motor running, in its winding current will mutations from 0 to 3 a or 3 a mutation to 0, the great changes in phase current, is bound to cause vibration and noise of motor running. If using subdivision driver, under the conditions of 10 subdivision drive the motor, step motor each run a micro, current changes in the winding is only 0. Rather than 3 a, 3 a and law of electric current is a sine curve changes, thus greatly improve the motor vibration and noise, therefore, on the performance of advantages is the real advantages of segmentation. Because subdivision driver to precisely control the motor phase current, so the driver should have quite high technical requirements and technical requirements, the cost will also be higher. Note that there are some domestic driver adopted & other; Smooth & throughout; “ Smooth & throughout; Is not precise control of the motor phase current, but the rate of change of the current slow some, so & other; Smooth & throughout; Does not produce micro step, and subdivision microstep can be used for accurate positioning. After motor phase current is smooth, can cause the drop of the motor torque control and not only do not cause the decline of motor torque, on the contrary, the torque will be increased.
