Brushless dc motor is used semiconductor switching device to realize the electronic commutation, with electronic switching device instead of traditional contact commutator and brush. It has high reliability, no commutation spark, and low mechanical noise, widely used in audio, video, electronic instrument and automation of office equipment. By the permanent magnet brushless dc motor (BLDCM), multipolar winding of the stator and rotor position sensor, etc. Position sensor according to the change of rotor position, along a certain sequence of stator winding current converter (By detecting the rotor magnetic pole relative to the position of the stator winding, and in determining the location of the position sensor signal, the signal conversion circuit to control the power switch circuit, after processing according to certain logic relation between winding current switch)。 The work of the stator winding. At the time of purchase of brushless dc motor controller needs from which a few aspects? Should pay attention to what issues? The motor controller is to introduce a thing or two, at the time of purchase of brushless dc motor controller selection may wish to compare, and see if it is useful. 1. Pay attention to the voltage controller of brushless dc motor voltage controlled by the position sensor output to provide electronic switch circuit. Choose brushless dc motor controller product, first of all, should choose the right voltage according to the customer need to choose the rated voltage to select the drive voltage parameters, pay attention to the use of voltage in the process of no-load and load does not exceed the scope stipulated in the drive. 2. Notice of the brushless dc motor controller, we will choose the drive of peak current choose the method of peak current is input current rating of the motor controller Ir (A), the peak current Ip (A)= 2 xir, otherwise the driver output current in use process without certain engineering allowance, if known to the rated output power of the motor controller (Or output power)Pr(W)And the driving voltage Vr (V), the peak current Ip (A)≧ 4xPr/Vr. 3. Pay attention to the using of the brushless dc motor controller temperature we can also according to the parameters set motor controller, but we need according to the different motor controller to set parameters, it is suitable for the use of the temperature, of course, we also need to be taken into account, the higher the temperature the more wide price. 4. Pay attention to the brushless dc motor controller according to the requirement of the power of insulation resistance, to guarantee the normal work of the drive, motor controller wire winding wire, ground wire and motor controller hall hall ground wire winding line between casing and insulation resistance is greater than 100 megohm 500 VDC, can withstand the 600 vac / 50 hz/ma / 1 seconds not breakdown pressure. Special note: brushless dc motor controller drives the brake motor controller are adopted in the end of the short circuit braking, motor controller operation has the brake force, don't work, there is no brake force, the greater the speed, the higher the brake force. Due to the braking current without using current sensing resistor, braking current can't control. So when braking speed cannot exceed safe braking speed, otherwise may burn out power tube, this feature, please use caution.
