It's a middrive Curry motor.
Is it brushed, or brushless? There are different controller types for each, and I've seen stuff about both kinds by Currie. (I couldn't find one made by Curry, if yours is spelled that way, and I haven't seen that kind before, myself.)
What power level is it designed for? (and what power level will it be used at?)
Any available information about it may help us help you find a solution that will work for you without destroying it.
FWIW, there are a lot of different kinds of cities, with different conditions (weather, terrain, traffic), and a lot of different "casual" riding styles. If each of us assumes our own version of those, you'll get a different recommendation from every person that replies, of which it's possible that none will apply to you, and none of which you will be able to tell if they do apply or not (because neither of us will know the conditions/etc of the other).
For instance, here I would say a 5-10A controller would work for what I myself consider casual city riding on a typical bicycle, because it's pretty much all flat, usually with no wind (and your own pedalling can usually overcome that if necessary--when the winds are high and gusty enough to make that a problem it can be unsafe to ride anyway) and there are bike lanes and sidewalks to keep out of traffic in many places, and back streets can be used most other places to stay out of traffic. So for a brushless motor, a tiny 6FET generic controller would work. Brushed motors could use an even smaller one--possibly even one intended for a little kick-scooter.
This is one possible brushless controller like that
which I've never used, so couldn't say how good it is. (the company ebikes.ca I would normally use doesn't have any low power controllers right now, just the PhaseRunner and variations (which would work, but are much more complicated to setup and have many features you don't need/want). KT and Lishui controllers would also work and are better quality compared to most "generics", but also have features and parts you don't want, though they are much simpler to setup than the PR family).
This is one possible brushed controller like that
which I've never used (I haven't used brushed controllers in such a long time I don't know which brands are better nowadays, just which characteristics are better to look for in them, but almost no seller states these as they don't usually know anything about what they sell).
Without sufficient info, we can just suggest things that would be overkill for most conditions, and those would probably work, but they will require more money, more space on the bike, and a bigger more expensive battery to handle them...and then if not setup to limit to what your motor can handle (whatever that turns out to be), may overheat and damage the motor.
For instance, you could go for a good display-less 40A controller, which would work for most conditions for casual riding, but it will damage or destroy a motor that is too small if the conditions / usage are harsh enough.
This is one possible brushless controller
(again, don't know anything about them; KT and Lishui controllers would also work and are better quality compared to most "generics", but have features and parts you don't want)
This is one possible brushed controller
(again, don't know anything about them)
Basically, if you don't define the job the system has to do for you, under the specific conditions it has to do it, it's only guesswork if any solution will work for you. The more info you can provide, the more likely that suggested solutions will be useful to you.
I just require a throttle control of the motor.
For that, almost any controller of almost any kind would work, as long as it has a throttle input***.
When looking at different models, please note that some of them that list they have PAS or any form of pedal sensor input are going to require you to pedal for the throttle to operate, some of these will work throttle-only. Most of those also have displays you don't want so you can see pretty quickly that they're not what you're after when looking at sales pages for them.
***and is compatible with your type of motor, and can supply enough current to operate the motor the way you need it to for your riding conditions and style, presuming the battery can do so.
