Thus, the speed of a DC motor can control in three ways: By varying the flux, and by varying the current through field winding. By varying the armature voltage, and the armature resistance. Through the supply voltage.
Why do we control speed of DC motor?
DC Motors plays an important role in energy conversion process. It is a machine which converts electrical energy into mechanical energy. In mechanical system, speed varies with number of task so speed control is necessary to do mechanical work in a proper way. It makes motor to operate easily.
Which motor is best for speed control?
Brushless DC motors are an advanced option due to their wide speed range, low heat and maintenance-free operation. Stepper Motors offer high torque and smooth low speed operation. Speed is typically controlled by manual operation on the driver or by an external switch, or with an external 0~10 VDC.
Is used to control the motor speed?
Well many people attempt to control the speed of a DC motor using a large variable resistor (Rheostat) in series with the motor as shown. … One simple and easy way to control the speed of a motor is to regulate the amount of voltage across its terminals and this can be achieved using “Pulse Width Modulation” or PWM.
What is base speed of DC motor?
SUBJECT: GENERAL PERFORMANCE SPECIFICATIONS – DC DRIVES
The base speed of a motor is the nameplate speed at the rated voltage and full load. load varies from no load to full load over the stated speed range. Example: 1% of base speed is 17.5 RPM.
What is DC motor speed?
DC controls adjust speed by varying the voltage sent to the motor (this differs from AC motor controls which adjust the line frequency to the motor). Typical no load or synchronous speeds for an AC fractional horsepower motor are 1800 or 3600 rpm, and 1000-5000 rpm for DC fractional hp motors.
Which motor is easier AC or DC?
By varying the armature winding current, it’s easy to control the speed of DC motors. Due to the nonappearance of commutators and brushes, AC motors require low maintenance. Due to the presence of commutators and brushes, DC motors require high maintenance. These motors can work on both single and three-phase supplies.
Which motor is variable speed?
Variable frequency drives or alternating current (AC) motor adjustable speed drives. They are used in synchronous motors and both in wound-rotor and in squirrel-cage rotor asynchronous induction motors.
How do gears reduce speed?
The basic gear changing rule is ‘brakes to slow – gears to go’. As the car increases speed, change up through the gears. When you want to slow down, use the foot brake. You need only change to a lower gear when you need the accelerator again to ‘drive’ the car.