P and N type Mosfet Servo Driver

[rlwoodjr]

First let me say I am a newbie to electronics. I wanted to build my own motor driver for a cnc router. I started a thread using a FAN73832 high/low side driver, but could never get it to work for very long. Thank you SgtWookie (from All About Circuits Forum) for all your help. I have abandon the project and move to an different one.

This circuit has both P type and N type mosfet's. In the given circuit, the logic that turns on the high side, also turns off the low side. Since the P mosfet's take 15 us to turn on and the N mosfet's turn off in less than 1 us, there is no shoot-thru. I designed this circuit on a simulator named SIMetrix-SIMPLIS. Simulation was real close to the real board.

I have gone to IRF5210's and IRF3710's for my mosfets. The micro-controller is the ATMEGA328P programmed with the Arduino software.

I am by no means done with this and would welcome any suggestions for a more robust design. I have tested this board for about 5 weeks and have not been able to break it. I still need to work on the firmware to the ATMEGA.

[rlwoodjr]

I am running 56 VDC, 2 to 3 amps motor turning at around 4000 rpm.

Test I have run so far:
1. A three second full speed (280 IPM) each way, no pause or deceleration in firmware (ran for a couple of hours)

2. long g-code file with Turbocnc connected as step/direction input

3. One second down to one millisecond back and forth at high speed. ( motor heats up, but the driver mosfets are a steady 122 F.

Here is my test setup. 16 TPI stationary screw with 1:1 belt drive. I plan to use 20 TPI for the router.

[chinsettawong]

Nice work!