hello im using My1016 motor wich is 14 ampere /24 volt 250 watt rated motor ,,
im using an H bridge all NMOSFETS transistors and IR2110 driver

the problem is when i measure the voltage delivered to the motor its 9v when i connect 12 v as volt for driving the mosfets and for the motor

and the mosfets Drain/ source corresponding to MOTOR terminals have like 10.8 volt

the problem that i feel tourque is reduced as i can stop the motor using my bare hands
which i cant do if motor is connected to battery directly

if im using the Driver and stopping the motor using my hands to stop it it gives 1,15 ampere MAX
which is too low for the motor

the mosfets get way too hot im using IRF3205

im connecting the IR2110 to the gate of transistors using 330 ohm resistor

im using " Arduino " with pwm frequency 500 hz,and duty cycle 98% (for the bootstrap capacitor )


i hope its sufficient information for u and if u need more i can provide



my 1st hope to keep going with the forum and to help others as u doo

Thanx

 

Hello,

Can you post a schematic of the setup?
That way we can see if there are corrections needed.

Bertus

 

Verify if your bootstrap voltages are at the correct level. With a 12V battery they are probably at most around 11V.
The bootstrap cap is charged when the lower FET is conducting, i.e. it needs to be conducting for a time sufficiently long.

And, yes, a schematic helps.

 

thank you guys for replying
@praondevou wat do u mean with bootstrap voltages like which terminals u mean excatly ??

@bertus
yes i will provide u guys with the schematics by mid night as they r not available to me now


thanks for showing interest

 

thank you guys for replying
@praondevou wat do u mean with bootstrap voltages like which terminals u mean excatly ??

Pin 6 to Pin 5 (Vb to Vs).

 

C1, C5, C6 : 100uF
C3, C4, C7, C8: 10uF
C2 : 100nF Polyester Capacitor

D1 : 1N4001 Diode
D2, D3, D4, D5, D6 : Schottky Diode
Q1, Q2, Q3, Q4 : IRF3205 Power MOSFET
R1, R2, R3, R4 : 330 ohm resistor
U1
U2, U3 : IR2110 High and Low Side Driver

PWM are fed into pins 10 and 12 on IR2110

dc source is the motor battery ,12 v is for mosfets to operate and to be regulated to 5 v and used for ir2110

im srry i m late and the schematic looks **** but i had do it again cuz the old schematic is not available to me

any thing u wana ask please tell me
hope u can help me
thnx

 

Maybe not relevant, but you need a good ground line for the motor current. You haven't really indicated any ground connection between motor power and control power. I'm sure you have one, but it needs to be more-than-enough. Use a nice fat wire until you sort this out.

 

The sources of the upper FETs are not connected to the driver (pin 5 as far as I remember).

Could you maybe bring this schematic into a more readable format? Something similar to figure 28A in this Application note: http://www.irf.com/technical-info/appnotes/an-978.pdf

 

Vb to Vs shall be 12v ? for both of 2 ICS ??

 

Vb to Vs shall be 12v ? for both of 2 ICS ??

Yes, at least. Their capacitors are charged through the low-side FET.