https://community.nxp.com/t5/Kinetis-Motor-Suite/Change-PWM-frecuency/m-p/679231#M199 <HTML><HEAD></HEAD><BODY><P>Juan,</P><P></P><P>There could be a couple different things going on here.</P><P>1. When you added the decimation into ADC1_IRQHandler the KMS tool didn't take that into account when it calculated the gains.</P><P><span class="lia-inline-image-display-wrapper" image-alt="2017-07-31 08_52_18-Kinetis Motor Suite_ C__Users_Adam_Documents_KMS_1.2.0_SavedProjects_TWRKV31F120.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/6358i0E2823C8EEC2706B/image-size/large?v=v2&amp;px=999" role="button" title="2017-07-31 08_52_18-Kinetis Motor Suite_ C__Users_Adam_Documents_KMS_1.2.0_SavedProjects_TWRKV31F120.png" alt="2017-07-31 08_52_18-Kinetis Motor Suite_ C__Users_Adam_Documents_KMS_1.2.0_SavedProjects_TWRKV31F120.png" /></span></P><P>KMS provides a way to do that decimation so that it will account for it correctly in the gain calculations. &nbsp;The PWM / Fast ISR is used for this purpose. &nbsp;We've ran up to 80kHz PWM with a divider of 4 successfully on the TWR eval kit.</P><P></P><P>2. If you are not using the reference hardware make sure that your power device is configured correctly. &nbsp;When you get into high speeds you are also at high modulations and if the deadtime isn't configured correctly this will destroy your power devices. &nbsp;See <A href="http://www.nxp.com/docs/en/application-note/AN5254.pdf">AN5254</A>&nbsp;for more information.</P></BODY></HTML> Mon, 31 Jul 2017 12:56:12 GMT linestream-adam 2017-07-31T12:56:12Z https://community.nxp.com/t5/Kinetis-Motor-Suite/Change-PWM-frecuency/m-p/679230#M198 <HTML><HEAD></HEAD><BODY><P>Hi! I changed PWM frecuency from 20Khz to 70Khz but the CPU use was very high (about 98%). So I add a counter inside&nbsp;ADC1_IRQHandler before call&nbsp;rda_push_int(); and now the CPU use is 51%.</P><P>I ran the motor to 30KRpm and everything was ok, but when I configure the motor to 60KRpm, after two minutes, the D3 mosfet has broken. It's happened two time.</P><P>does anybody know why?</P><P>thanks!</P></BODY></HTML> Fri, 21 Jul 2017 18:40:34 GMT https://community.nxp.com/t5/Kinetis-Motor-Suite/Change-PWM-frecuency/m-p/679230#M198 juanmas 2017-07-21T18:40:34Z https://community.nxp.com/t5/Kinetis-Motor-Suite/Change-PWM-frecuency/m-p/679231#M199 <HTML><HEAD></HEAD><BODY><P>Juan,</P><P></P><P>There could be a couple different things going on here.</P><P>1. When you added the decimation into ADC1_IRQHandler the KMS tool didn't take that into account when it calculated the gains.</P><P><span class="lia-inline-image-display-wrapper" image-alt="2017-07-31 08_52_18-Kinetis Motor Suite_ C__Users_Adam_Documents_KMS_1.2.0_SavedProjects_TWRKV31F120.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/6358i0E2823C8EEC2706B/image-size/large?v=v2&amp;px=999" role="button" title="2017-07-31 08_52_18-Kinetis Motor Suite_ C__Users_Adam_Documents_KMS_1.2.0_SavedProjects_TWRKV31F120.png" alt="2017-07-31 08_52_18-Kinetis Motor Suite_ C__Users_Adam_Documents_KMS_1.2.0_SavedProjects_TWRKV31F120.png" /></span></P><P>KMS provides a way to do that decimation so that it will account for it correctly in the gain calculations. &nbsp;The PWM / Fast ISR is used for this purpose. &nbsp;We've ran up to 80kHz PWM with a divider of 4 successfully on the TWR eval kit.</P><P></P><P>2. If you are not using the reference hardware make sure that your power device is configured correctly. &nbsp;When you get into high speeds you are also at high modulations and if the deadtime isn't configured correctly this will destroy your power devices. &nbsp;See <A href="http://www.nxp.com/docs/en/application-note/AN5254.pdf">AN5254</A>&nbsp;for more information.</P></BODY></HTML> Mon, 31 Jul 2017 12:56:12 GMT https://community.nxp.com/t5/Kinetis-Motor-Suite/Change-PWM-frecuency/m-p/679231#M199 linestream-adam 2017-07-31T12:56:12Z