Universal Motor Control

[xchvcwryb]

Nice video, Complete with overview of your measuremt setup and explanation of what's goin on. Keep up the good work.

Just a little note: Most scopes have an option to trigger from the mains frequency.

This will increase the trigger stability.

[xchvcwryb]

Most scopes can directly trigger from the mains frequency.

This gives much more stable triggering.

[lipin84]

I like it. Is it a common driving scheme used in domestic appliances (lets say in handheld blender)?

[lipin84]

@lipin84 BTW Showing effect of inductance forcing current flow is great.

[DirceuRodriguesJr]

Yes, provided it is not cordless (battery operated). The video shows a cake mixer engine with 4 speed modes (i.e. 4 winding taps). In order to do the electronic speed control, the motor is locked on higher-speed connection. Also, the isolation helps when imersion is required - such as blender.

[HLSDK]

ThankyouThankyou!

[HLSDK]

Is that a premade current transformer or was it wound by yourself? The reason I ask is that I am trying to design an AC ammeter with a meter with 75mV movement. Just curious

[DirceuRodriguesJr]

This is a current transformer I used in old project (built by a local company, specializad in magnetics) and mounted over a home made PCB. Current relation: 1000:1 (max primary 40A, 60Hz).