L298n anode has a 5 v output voltage-CodePudding

Recently with PWM speed regulating l298n drive 12 v motor, motor l298n connection negative ports have 5 v voltage, don't pick up motor l298 anode voltage is zero, the output end of the what is this excuse me?

CodePudding user response:

L298n can make dc motor and reversing, motor negative ports have 5 v voltage is normal,

CodePudding user response:

reference 1st floor xuyaqi029 response:

l298n can make dc motor and reversing, motor negative port is 5 v voltage is normal,

thank you, I may not be clear, anode voltage 5 v motor, the positive 8.2 v, is this normal

CodePudding user response:

refer to the second floor weixin_45989653 response:

Quote: refer to 1st floor xuyaqi029 response:
l298n can make dc motor and reversing, motor negative port is 5 v voltage is normal,

thank you, I may not be clear, anode voltage 5 v motor, the positive 8.2 v, this kind of circumstance normal

Estimated amount of the land, are you from actual 8.2 5=3.5 v motor, as long as the machine work is normal, need not tube motor output to ground voltage, only care about voltage on both ends of the motor output,

CodePudding user response:

The remaining voltage on MOS tube

CodePudding user response:

reference xuyaqi029 reply: 3/f

Quote: refer to the second floor weixin_45989653 response:

Quote: refer to 1st floor xuyaqi029 response:
l298n can make dc motor and reversing, motor negative port is 5 v voltage is normal,

thank you, I may not be clear, anode voltage 5 v motor, the positive 8.2 v, this kind of circumstance normal

Estimated amount of the land, are you from actual 8.2 5=3.5 v motor, as long as the machine work is normal, need not tube motor output to ground voltage, only care about the voltage on both ends of the motor output,

reference 4 floor zoointin response:

the remaining voltage on MOS tube

Thanks for your reply,

I'll arrange problem:
To l298n drive through PWM motor speed control MCU, l298n power supply voltage is 12 v, when motor is connected, under a certain duty ratio, using a multimeter to measure the l298n under the two ports of voltage at the output, a 5.2 v, a 8.7 v, the voltage difference is 2.5 v, no motor, l298n output end of the two ports to ground voltage is 0 v and 12 v respectively,
Replace motor l298n connection with pure resistance, l298n of two output port to ground voltage is 11 v and 1.7 v respectively,

Now after see you reply, my understanding is that when meet motor l298n produced 5.2 v and resistance of the ground voltage of 1.7 v, is actually the l298n the voltage the partial pressure of the MOS tube, understand it right?
If MOS tube will be partial pressure, then at the ends of the motor voltage is impossible to reach 12 v, is there any way to reduce or eliminate the partial pressure of the MOS tube?
Thank you very much!

CodePudding user response:

PWM is originally by different voltage to dc motor speed control, you will now with MOS tube under static pressure is necessary, you should now be concerned about the relationship between duty ratio and motor speed,