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Sure... I used my cheap phone camera to make oscilloscope screen photos...
The picture below shows the voltage on one phase (measured between DC-bus negative and phase output). The connected motor is 150W induction motor and runs non-loaded.
The picture below shows the single phase current...
I made a small, 1A, inverter to drive standard small induction motors. Read details **broken link removed**. Schematics, PCB layout and demo software are available.
The inverter is supplied by 230VAC, Uses IRF840 MOSFETs, PWM is at 15kHz, is pretty elementary and... is easy to build at home. It...
This one is almost trivial...
To parametrize/configure simple DIY boards powered by small 8-bit microcontrollers, one might use DIP switches or jumpers... Last few weeks I am experimenting with another solution - to define parameters on a smartphone GUI and then transfer them into the tiny...
I made this **broken link removed** as a robust unit that can be used for experimentation. Discrete MOSFETs are used in H-bridges, and the board is controlled by ATmega8... The driver has more advanced motor current measurement abilities so that progamming can be easier.
I see it through the load (I inserted a 1ohm resistor in series to load and I am measuring voltage over it using my scope).
(BTW, I know that two H-bridges inside single L298 can be paralleled to double capacity - but I don't know will this double its current-spike handling abilitiy.)
I use L298 dual H-bridge to drive a stepper motor. The L298 fails eventually (after few hours).
I see current spikes that happen at switching moments - up to 6A, 100ns (the datasheet for L298 says that maximum allowed spike is 3A, 100ns). The spike is, I suppose, product of parasitic capacity...
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