How this connector is called?

[rodyginv]

I have an old ebike which has a problem with a controller.
I want to replace controller but I can't find a controller with proper connector for a motor.
This is a connector which I have. How can I find a controller with same connector?

 

[Nealh]

Connector is old 3pin julet model for sensorles hubs, they are quite rare now.

Look for an sensorless controller and display with 3 pin outs.

 

[Nealh]

This the type you need with no hall sensors, though this one may be a bit a larger then your one. With the KT you would need to buy a kt display as well.
Ebike Sensorless Brushless Motor Controller DC 36V/48V 500W 9-FET 20A KT Square | eBay

This one is 15a 6 mosfet from china seller.
T06P 24V/36V250W 15A KT Square Wave Brushless Controller for Ebike [T06P Controller] - $20.90 : Zen Cart!, The Art of E-commerce (topbikekit.com)

 

[saneagle]

Cut off or unsolder that connector from your old controller and solder it to the new one. That gives you the opportunity to get the motor direction correct. You'd be gutted if you found a sensorless controller with that connector, only to find that your motor went backwards.