By varying the Resistance to the motor. These Devices are called RHEOSTAT'S
If you increase the number of bulbs in a circuit, the resistance in the circuit will increase, causing the motor's speed to decrease. If you decrease the number of bulbs, the resistance in the circuit will decrease, causing the motor's speed to increase.
An SCR chip is commonly used to control the speed of a motor. The speed is controlled using an AC circuit and phase angles.
By using your brain
An autodrome is a circuit used for motor sports events, but not for high-speed racing.
The blower motor fuse protects the blower motor electrical circuit. The blower motor relay operates only the high speed function of the blower motor. The blower motor speed resistor operates the lower speed functions of the blower motor.
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if you can't change the RPM of the motor, you have to change the gearing of the chain drive. Fit a smaller sprocket to the motor to slow the conveyor down, or a bigger to speed it up.
The "relay' may be under the plastic cover on the fire wall close to the fan motor except it is a transistorized speed control circuit. Look for 2 wires from the fan motor going to a three or four pin plug onto the circuit board.
On an AC motor you basically vary the frequency on a DC you can vary the voltage.
When an induction motor is pushed over synchronous speed it will become a generator and will deliver power back to the utility.
idle speed control motor circuit fault code
For commercial units, partstown.com or 3wire.com (in resources)