Servo motor servo motor electronic gear ratio is the pulse frequency of servo to the upper machine under expansion may be narrowed, during which a parameter for molecules, one for the denominator. Such as molecules is greater than the denominator is expanded, such as molecules is smaller than the denominator is narrow. For example: PC input frequency 100 hz, the electronic gear than molecules are set to 1, the denominator is set to 2, then speed servo practice in accordance with the pulse of the 50 hz. PC input frequency 100 hz, the electronic gear than molecular set to 2, the denominator set to 1, then the speed servo practice in accordance with the pulse of 200 hz. Electronic gear ratio is relatively mechanical gear meshing, the number of teeth on the gears than speaking. Is now often say a way of shaftless drive the role of electronic gear than with 17 encoder of the motor, for example, every revolving servo motor, servo motor servo amplifier to transfer 131072 pulses, and 131072 pulse encoder reaction to the servo amplifier. Assume that we want to make the motor rotates at a speed of 20 r/s, if do not set the electronic gear ratio, we will send 2621440 pulses per second to the servo amplifier, pulse frequency of 2621440 hz. But let's send pulse device with PLC and so on, all have send pulse frequency constraints, generally for 200 KHZ or 500 KHZ. Then we introduce the concept of electronic gear can reduce send pulse frequency to the servo amplifier. Servo motor electronic gear ratio calculation method of motor encoder resolution servo motor encoder is commonly 2000 line may be 2500 line, which is on a business trip to perhaps 2000 2500 pulses, and servo driver for four times the frequency of this pulse processing, so one revolution of the motor can perhaps 8000 10000 pulses, maybe, that is, a resolution of 8000 10000. Through the secondary transmission device, the perspective of structural movement converted onto the motor viewpoints and secondary transmission ratio is inversely proportional to, for example the secondary transmission ratio for a quarter of the motor turning point of view is the shaft turning 4 times. Structure of gear tests: now in the market there are two main gear: taboret mobile 0. 1 mm when the turning point of view of 0. 36°And 0. 45°。 Most of the machines are 0. 36°The gear. Servo motor electronic gear than setting to a maximum speed of intention of the Settings of the servo motor rotates, speed reflected on accuracy, expectations will motor speed function thoroughly manifested; And about the rotation when the lower resolution requirements. Claims to choose the following way to set up 1)Conditions and requirements, assumed to set the servo motor rotating speed of 3000 r/min, pulse encoder lap 8192 pulse/rev2)To clarify related to 3000 r/min speed pulse frequency of 8192 & amp; 次; 3000/60=409 600HZ=409. 6 KHZ pulse output highest when the controller only for 100 KHZ, divides the molecules of electronic gear ratio of CMX and denominator parts of CDV are set to 1, and then by the controller worldwide rotate out of 10 KHZ pulses, as their top speed 1/10 of the pulse frequency, servo motor speed for (at the moment10/409. 6)&次; 3000≈Calculation speed 73 r/min, if not, can direct supervision drive speed value, and it should be 73 r/min. 3)Expect speed should be set up to 10 KHZ pulse 3000 / min, but the practice of 73 r/min. For the correction practice speed to 300 r/min. It is necessary to correct the electronic gear ratio. 73 &次; CMZ/CDV=300（R / MIN)Therefore, CMX molecules can be set to 300, CDV denominator can be set to 73. Controller for 100 KHZS speed pulse output frequency is 3000 & amp; 次; [﹙300/73﹚报; 100000] / 409600 = 3009 r/MIN ignored everything in this instance structure condition, and practical applications it is necessary to consider the transmission part of the resolution, if can't neglect rate eventually lead to change of points product use. To mechanical organization resolution for the purpose of electronic gear than the Settings of the servo motor in applied in process control and operation, the machining accuracy requirements should take precedence over speed feed at the moment. When accuracy reached after considering the speed problem. Thus electronic gear ratio Settings is necessary to give priority to the controller output pulse can't arbitrarily expanding, because of the output pulse frequency will affect the resolution. Claims priority setting of electronic gear ratio. 1)T conditions and requirements assume to set additional servo motor rotating speed of 3000 r/MIN each lap pulse encoder is 8192 pulse/rev; Controller pulse output maximum frequency of 100 KHZ; Servo motor link to decelerate organization, input pulse: output pulse = M: N = 3; Slow output shaft link organizations lead to 10 mm ball screw. 2)Calculate to clarify the resolution of the servo motor by slow organization drive workbench is (10/8192) & times; ﹙1/3﹚≈ 0. 0004069 (mm/pulse）= 0. 4069μM/pulse screw the number of pulses per round is 10/0. 0004069≈24576 (pulse/rev）If expectations of the controller output variable rate for 1 & mu; M/pulse, screw the number of pulses per turn into 10/0. 001=10000pulse/rev10000×﹙CMX / CMD)= 24576 pulse/rev controller send servo under pulse and pulse CMX molecules can be set to 24576, CDV denominator can be set to 10000, according to such a maximum speed of servo motor (100000 & times; 24576×60﹚/﹙8192报; 10000﹚= 1800 r / min1800r /分钟《3000 r / min。 So the motor rotation speed can reach 3000 r/min, but the resolution of the servo motor will reach the expected effect.
