Controlling high RPM PMDC motor using arduino (PWM)

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Joined Nov 12, 2018
I want to control my motor using pwm (Arduino), I was going to use scr controller but as its shipment is delayed I am thinking of canceling it. Now my question is can pwm can reduce the rpm say 4900 to just 40 or below. I really need to slow this motor down to this much value as I have salvaged it from a treadmill. second question is that will it effect the torque? . everyone saying don't use scr, and as I have studied it is cheap but very noisy and need to use firing angle to control which is more like a rough way of controlling a motor.

MOTOR specs : permanent magnet DC motor
1.5 HP @ 100VDC
14 amps
4900 RPM
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