dip04051978 Posted August 9, 2003 Report Share Posted August 9, 2003 Hello Dear Friends, I FOUND A PROBLEM OF STARTING OF SLIPRING MOTOR IN 1ST STEP OF OPERATION in our machine. THE DETAIL’S ARE US UNDER:KW: 13.5FLC : 29AROTOR V: 230ROTOR A: 35 1ST STEP RESISTANCE : 6.842ND STEP RESISTANCE : 1.93RD STEP RESISTANCE : 0.764TH STEP RESISTANCE : 0.19 AT 1STEP MOTORS RUNS FOR A WHILE & STOPPED. CAN U HELP ME TO SOLVE THIS PROBLEM?? THE MOTOR IS USED FOR A TRAVEL ON A MOVING MACHINE. I THOUGHT THERE IS PROBLEM IN CAL. RESISTANCE. My email id is dip04051978@yahoo.com. Link to comment Share on other sites More sharing options...
marke Posted August 9, 2003 Report Share Posted August 9, 2003 Hello dip04051978 The rotor resistance determines the slip at which maximum torque occurs. If the resistance is increased, then the slip at which the maximum torque occurs reduces. From your description, I would expect that there is a problem with the thermal capacity of the 1st step resistors and that they are getting excessivly hot. This will probably cause the resistance to go high, and depending on where the torque curve lies in relation to the speed of traverse, the torque could drop and cause the stall to occur. Remeber that there is a very high power dissipation in the resistors and that metalic resistors go high in resistance when hot, while liquid resistors tend to go low when hot. Best regards, Mark Empson | administratorSkype Contact = markempson | phone +64 274 363 067LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters Link to comment Share on other sites More sharing options...
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