Can this 19.5 V/3.33 A/65 W laptop charger power this 12 V/45(maybe) W motor?
Using the Laptop charger will reduce the performance of your motor, in turn kill your coils. I can say that safely because your coils will pull more current because of the voltage and power rating.
As an alternative I would suggest you purchase a 12V adaptor. These are easily available in any Electronics shops nearby. It has a max output current of 1A (depends on the company you buy it from). It'll suffice for your applications.
Hope this helped.