Selection of resistor rating / type / value for crane hoist & travel |
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Selection of resistor rating / type / value for crane hoist & travel |
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 Aug 11 2003, 04:47 AM
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#1
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Intermediate Member  Group: Full Member Posts: 18 Joined: 9-August 03 From: Anand Member No.: 445  |
SIR,
HOW I CAN SELECT STARTING RESISTOR VALUE / RATING / TYPE FOR CRANE TRAVEL & HOIST APPLICATION?? REGARDS, DIPAK |
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Aug 16 2003, 10:29 PM
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#2
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Posting Freak Group: Moderator Posts: 2,063 Joined: 24-April 02 From: Christchurch, New Zealand Member No.: 1 |
hello Dipak
Changing the value of the resistors in the rotor circuit of a slipring motor, causes the speed torque curve to be altered. As you increase the rotor resistance, the speed of the maximum torque reduces. If you know the load torque and speed required, you can calculate the speed torque curves for the motor with different resistors and use these curves to determine the the required resistance value. While operating at reduced speed, the slip losses are dissipated in the resistors. You must select resistors of sufficient power rating to withstand this power. Best regards, -------------------- Mark Empson administrator
Skype Contact = markempson | phone +64 274 363 067 LMPForum | LMP Tech Warehouse | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | LMP Software | Mark Empson Website |
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