Haven't connected it yet.
90W. DC, but what supply voltage? If you were supplied a diode, that should have been connected also. If needing that, it's not an AC/DC type motor, just DC. Even if voltage OK, it would smoke on AC.
90 W doesn't tell you what voltage it is supposed to get and 230V rectified is likely frying it.
GOOD EXPERIMENT AND YOU BURNT IT WELL ! WHAT IS THE DC MOTOR VOLTAGE RATING ?? HOW MANY RECTIFIER YOU USED ? HOW YOU CONSTRUCTED THE RECTIFY CIRCUIT? HALFWAVE OR FULLWAVE ? FULLWAVE PRODUCES 207Vdc ! HALFWAVE PRODUCES ABOUT 115Vdc, BUT NOT GOOD TO RUN DC MOTOR WITH HALFWAVE. YOUR DC MOTOR IS GONE, TRY ANOTHER ONE THAT MATCH WITH THE VOLTAGE.
A DC motor is not designed to work with AC. Get an AC motor for your application or a rated AC to DC converter. Any diode across AC (assumed source from the power company) will turn to smoke without a current limiting resistor. I suggest you bone up on some accredited electrical education before you hurt yourself or cause a fire.
