bir_alma Posted December 18, 2006 Report Share Posted December 18, 2006 I am working on constant voltage by frequency(v/f) control of 3-phase induction motor for my final project. I think this is achieved by using PWM invertors, and I will do it by that. There are different methods of generating PWM wave. I can not use the DSP based because I can't get these type of chips due to economic reasons. So what do you advise me on the type of PWM wave generator and how to achieve it easily with reasonable price? I am waiting your help.Thank you inadvance. Quote Link to comment Share on other sites More sharing options...
Gazza Posted December 23, 2006 Report Share Posted December 23, 2006 I am working on Quote Link to comment Share on other sites More sharing options...
bir_alma Posted December 24, 2006 Author Report Share Posted December 24, 2006 I want to design the iverter only.Thank you Quote Link to comment Share on other sites More sharing options...
Gazza Posted December 25, 2006 Report Share Posted December 25, 2006 What is the rating of your motor? Quote Link to comment Share on other sites More sharing options...
bir_alma Posted December 25, 2006 Author Report Share Posted December 25, 2006 The rating of the iduction motors that I am going to control is above 5 HP, 415V, 3-phase wound rotor or squirrel cage .The available materials for me are , 8085 and 8086 microprocessors with their interfecing devices , interfacing cards like DAC and ADC , 8051 microcontroller.Thank you Gazza. Quote Link to comment Share on other sites More sharing options...
Gazza Posted December 26, 2006 Report Share Posted December 26, 2006 The rating of the iduction motors that I am going to control is above 5 HP, 415V, 3-phase wound rotor or squirrel cage .The available materials for me are , 8085 and 8086 microprocessors with their interfecing devices , interfacing cards like DAC and ADC , 8051 microcontroller.Thank you Gazza.Sounds good to me, so you just need to program the PWM sequence and build the power circuit.It is going to be a lot of work, I will be interested to see how it turns out :) Quote Link to comment Share on other sites More sharing options...
bir_alma Posted January 26, 2007 Author Report Share Posted January 26, 2007 Hi evreybody. I have changed my idea on the method of generating the SPWM signals for the inverter. That is I want to design it using analog electronics. I have generated the carrier triangular wave and i am going to use wien bridge oscillator or the 8038 function generator IC. Which type of switch MOSFET or IJBT is most appropriate for my application and with this what is the possible carrier frequency?I need your help. Quote Link to comment Share on other sites More sharing options...
AN920 Posted January 26, 2007 Report Share Posted January 26, 2007 There are many chips available for this application. They will include all the special features like start boost, braking, reverse etc. which will be complex doing it with analog methods. Quote Link to comment Share on other sites More sharing options...
bir_alma Posted January 30, 2007 Author Report Share Posted January 30, 2007 How about for Single phase Induction motor, is it possible? Quote Link to comment Share on other sites More sharing options...
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