A torque motor is a specialized form of electric motor which can operate indefinitely while stalled, that is, with the rotor blocked from turning, without incurring damage. In this mode of operation, the motor will apply a steady torque to the load (hence the name).
What is the input power?
In electrical engineering and mechanical engineering, the power rating of equipment is the highest power input allowed to flow through particular equipment. According to the particular discipline, the term “power” may refer to the electrical or mechanical power.
What is the formula for calculating rpm?
· Formula for RPM Calculation · The basic equation used to calculate the proper RPM for machining is as follows: RPM = (cutting speed x 12)/(pi x diameter) Where the cutting speed is in feet/min and the diameter is in inches.
What is a torque?
Torque is a measure of how much a force acting on an object causes that object to rotate. The object rotates about an axis, which we will call the pivot point, and will label ‘O’. We will call the force ‘F’.
What is motor pull out torque?
In synchronous motors the value of pull-out torque is a maximum value of torque which allows a synchronous motor to remain in synchronism without “pulling out” of step or synchronism.
What is the difference between load and torque?
When a motor is running in steady state, the armature current is constant, and the electrical torque is equal and opposite of the mechanical torque. When a motor is decelerating, the motor torque is less than the load torque. Conversely, when a motor is accelerating, the motor torque is higher than the load torque.
What is motor pull up torque?
Locked Rotor Torque (LRT) is the torque developed by the motor at standstill. This is sometimes also referred to as starting torque. Pull Up Torque (PUT) is the minimum torque developed by the motor as it accelerates from standstill to the speed at which breakdown torque occurs.
What is the torque of a car?
What does Torque in a Car do? Torque is the amount of “turning power” you have, much in the same way you turn a wrench. 369 foot-pounds means that if you had a wrench that was 1 foot long, and applied a force of 369 pounds directly perpendicular to that wrench, you would get 369 foot-pounds of torque.
What is the formula of torque?
The point where the object rotates is known as the axis of rotation. Mathematically, torque can be written as T = F * r * sin(theta), and it has units of Newton-meters. When the sum of all torques acting on an object equals zero, it is in rotational equilibrium.
What is speed torque characteristic?
Motor characteristics are frequently given as two points on this graph: The stall torque, , represents the point on the graph at which the torque is a maximum, but the shaft is not rotating. The no load speed, , is the maximum output speed of the motor (when no torque is applied to the output shaft).
What is torque in induction motor?
An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor’s rotor can be either wound type or squirrel-cage type.
What is rated torque of a motor?
Rated torque is the maximum continuous torque available at the design speed that allows the motor to do the work without overheating. Starting torque is the torque the motor delivers at zero speed. i.e. startup. It is also called the stall torque.
What is the difference between speed and torque?
For a motor, speed is measured in revolutions per minute. Torque is force exerted as an object rotates. An eight cylinder car engine can run at 3600 RPM and exert a great amount of torque. A small generator will run at 3600 RPM, but not exert nearly as much torque as the car.
What is the meaning of starting torque?
Starting torque is the amount required to overcome the inertia of a standstill. Pull-up torque is the minimum torque generated by a motor as it accelerates from standstill to operating speed. If a motor’s pull-up torque is less than that required by its application load, the motor will overheat and eventually stall.
Why is an induction motor called a rotating transformer?
An induction motor is sometimes called a rotating transformer because the stator (stationary part) is essentially the primary side of the transformer and the rotor (rotating part) is the secondary side. This changing magnetic field pattern can induce currents in the rotor conductors.
What is the relationship between speed and torque?
The relation between the torque of vehicle and speed is Power = Torque x Speed. So as the speed increases, the torque decreases. The torque and power produced by the engine is varied in following manner: As you can see, the maximum torque is obtained at around 50% of the engine speed.
What happens to torque when you increase speed?
Torque can be understood to be the effort behind the work done and angular speed specifies the rate at which it happens. If the input power is constant, torque and angular speed become inversely proportional. Only then does the angular speed decreases as the torque increases.
What is meant by electrical torque?
Mechanical or load torque is proportional to the product of force and distance. Motor current varies in relation to the amount of load torque applied. When a motor is running in steady state, the armature current is constant, and the electrical torque is equal and opposite of the mechanical torque.
What is a service factor?
Motor service factor (SF) is the percentage multiplier that a motor can handle for short periods of time when operating within its normal voltage and frequency tolerance. In other words, it is a fudge factor that give extra horsepower when it’s occasionally needed. To the rated armature current of a DC motor, or.
What is the meaning of locked rotor torque?
Locked Rotor or Starting Torque. The Locked Rotor Torque or Starting Torque is the torque an electrical motor develops when starting at zero speed.
What is meant by pull out torque?
Definition of pull-in torque. : the maximum constant torque under which a motor will accelerate from rest to approximate normal speed.
What is a locked rotor motor?
Locked Rotor Amps, sometimes abbreviated LRA, is exactly what the name implies. If the rotor is locked and can’t move while electrical power is applied, the motor will draw this many amps. Locked Rotor Amps are much higher than running amps, generally around five times max running amps.