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Which type of DC motor would be best suited to drive a lift?
Cumulative Compound DC Motors are used for Elevators or Lifts because it has Variable Speed, Adjustable varying speed and High starting torque. The latest elevator or lifts designs use 3-phase induction motors with variable frequency drive electronic controls.
What is a series DC motor?
A series DC motor connects the armature and field windings in series with a common D.C. power source. The motor speed varies as a non-linear function of load torque and armature current; current is common to both the stator and rotor yielding current squared (I^2) behavior.
How does a DC motor work in an elevator?
For high-speed elevators, however, DC motors were used. This is because DC motors usually have higher starting torque than AC motors. A cross-section of the DC motor is shown in Figure 3. DC passes through respective field windings on the stator poles to produce a magnetic flux around the pole, Φf.
Where are DC series motors used?
Series DC motors are generally used where high starting torque is required, and speed variations are possible. These types of direct connection motors are, for instance, used in the traction system, cranes, air compressors, vacuum cleaners, sewing machines, etc.
What happens when a DC series motor is connected to AC supply?
As the motor is DC so the field and armature winding made for DC supply. The winding which is made for DC always has more resistance than the winding which is made for AC. For this reason, the motor will be run in very less speed on AC supply. When DC motor Runs on AC supply more loss and heat will occur in the motor.
How does DC series motor works?
A series DC motor converts electric energy to mechanic energy based on the electromagnetic principle. As a result, the motor gets a huge supply of power from the terminals. By the flow of this large current in the armature and field coils, a strong magnetic field is produced that creates a massive torque in the shafts.
What are DC motors used for?
Small DC motors are used in tools, toys, and appliances. The universal motor can operate on direct current but is a lightweight brushed motor used for portable power tools and appliances. Larger DC motors are currently used in propulsion of electric vehicles, elevator and hoists, and in drives for steel rolling mills.
What are the application of DC series motor?
Are elevator motors DC?
Also DC is typically preferred for easier RPM control (like in trains, tramcars, etc) but this is not a problem for elevators – they typically use two-speed three-phase AC motors and speeds are changed by switching the number of poles. …
What is the purpose of a DC motor?
A direct current (DC) motor is a type of electric machine that converts electrical energy into mechanical energy. DC motors take electrical power through direct current, and convert this energy into mechanical rotation.