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A New Method for Sewing Machine Starting Based on BLDCM

According to the characteristics of the sewing machine, a new starting method was presented on the basis of the analysis on the characteristics of application of brushless DC motor, which is the three-step starting technique during the sewing machine starting. The experimental results indicate that this method significantly enhances the speed of starting and improves the reliability of the equipment, as well as more adaptive performance and better in dynamic response.

Brushless direct current motor (BLDCM) to have the volume to be small, the movement is reliable, the control precision is high as well as maintenance convenience merits and so on, simultaneously also have characteristics that is the efficiency to be high and the velocity is easy to be adapt[1]. In recent years, along with the modern electronic technology’s fast development, this kind of motor already widely applied in the industrial field. The brushless direct current motor more and more to be used in the sewing machine manufacturing industry. At present, the Brushless direct current motor’s control mode to have many kinds, the classics PID control, afterward presented the auto-adapted fuzzy PID control, as well as other advanced control method [4]. Regarding the sewing machine, the starting time can be changed during the motor startup, based on this adjust, simultaneously it requested that the motor have no the over modulation basically and fast stable. The present control method is not very ideal.This article according to the control mode of brushless direct current motor as well as the sewing machine to electrical machinery’s characteristics that the start time is requested, uses three step of start methods, the soft initialization mode is used in the first starting period, the PI adjustment is used in the second starting period and changes the acceleration, uses the PID adjustment in the final starting period, in which pre-treats the over modulation, the controller completes the motor from the start to the stability. Starting time’s adjustment may be carry on in the starting period. The experimental result indicated that the system’s starting ability and the dynamic response performance is good by using this method. The running effect is also satisfactory. VS Sewing Machines

 New Method for Sewing Machine Starting Based on BLDCM

Brushless direct current motor (BLDCM) to have the volume to be small, the movement is reliable, the control precision is high as well as maintenance convenience merits and so on, simultaneously also have characteristics that is the efficiency to be high and the velocity is easy to be adapt[1]. In recent years, along with the modern electronic technology’s fast development, this kind of motor already widely applied in the industrial field. The brushless direct current motor more and more to be used in the sewing machine manufacturing industry. At present, the Brushless direct current motor’s control mode to have many kinds, the classics PID control, afterward presented the auto-adapted fuzzy PID control, as well as other advanced control method [4]. Regarding the sewing machine, the starting time can be changed during the motor startup, based on this adjust, simultaneously it requested that the motor have no the over modulation basically and fast stable. The present control method is not very ideal.This article according to the control mode of brushless direct current motor as well as the sewing machine to electrical machinery’s characteristics that the start time is requested, uses three step of start methods, the soft initialization mode is used in the first starting period, the PI adjustment is used in the second starting period and changes the acceleration, uses the PID adjustment in the final starting period, in which pre-treats the over modulation, the controller completes the motor from the start to the stability. Starting time’s adjustment may be carry on in the starting period. The experimental result indicated that the system’s starting ability and the dynamic response performance is good by using this method. The running effect is also satisfactory.Take LPC2292 Central Processing Unit as its control system key part of DC motor, adopts other designs both of hardware and software, completed a suit of driving system. The LPC2292 micro controllers are based on a 16/32-bit ARM7TDMI-S CPU with real-time emulation and embedded trace support, together with 256 KB of embedded high-speed flash memory. A 128-bit wide memory interface and the unique accelerator architecture enable 32-bit code execution at the maximum clock rate. The alternative 16-bit Thumb mode reduces code by more than 30 % with minimal performance penalty [13]. hree steps to control motor, the motor start up fast during t1, which can be changed in sewing machine system. When the velocity is set in 2000r/m, the PWM value is increased gradually. We obtain the motor’s velocity by test the Honeywell sensor’s pulse wide. There are six pulses when the motor round one ring. The starting time is increased gradually in the different given motor’s velocity,In the experiment discovered when receives the strong electromagnetic interference, in view of ARM system CPU characteristic, on the one hand establishes watch-dog register, the system automatic reset microprocessor. On the other hand, changes undefined instruction the revision to cause CPU to enter time the normal stateBecause the load is different, the system’s response is different. The starting time is different by using other control mode. In order to realize the starting time is same in different load with sewing system, which the load is small when the sewing machine is not sewing the cotton material, if the machine is sewing, then the load is big. Adopts the three steps control mode, the system can change PWM value according to different load. The result indicated that the system response speed is quick, the stability good, does not have the over modulation basically. The brushless direct current motor’s stable state situation meets the design requirement https://www.vssewingmachine.in/

Regarding the sewing machine control system, uses the PID control algorithm merely, the control effect is not very good. According to the brushless direct current motor’s control mode, as well as the direct current motor’s characteristics of sewing machine, the start time can be change if needed, this paper propose the three-step start method, which is the soft start proportional control method in the beginning of the direct current motor. In order to deduce over modulation, uses PI and PID control modes when motor’s velocity is close to the given value. Uses the variable proportion value to control the brushless direct current motor acceleration in the start, and uses the PID adjustment and the over modulation during the motor’s startup will be over, as well as pre-treats PWM value to control the motor’s velocity from the start to the stability. The result indicated that uses this start method to be able to cause the system easy to realize, the reliability high, not to have the over modulation basically, simultaneously realizes the starting time adjustment. At present, the controller of using this control mode has installed on many sewing machine, the effect is satisfactory

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