How is torque maintained in a DC motor?
The torque of the motor is proportional to the product of the armature current, the main pole flux(field) and a machine constant which is a function of the armature windings. This means that if the shunt field excitation is kept constant, the torque is dependent solely upon the armature current.
How do you increase the torque of a motor?
An effective modification that will increase torque significantly is to install a turbo or supercharger. Forced induction forces air into your engine, increasing the power the engine provides. Depending on the torque curve you prefer, a turbocharger will need time to spool before it provides torque benefits.2021-06-30
What is Direct torque technology?
High-performance AC drives from ABB offer an innovative technology called direct torque control (DTC). As the name suggests, the method controls motor flux and torque directly, instead of trying to control motor currents indirectly like AC vector drives and DC drives.
How does torque control work?
Direct torque control (DTC) is one method used in variable-frequency drives to control the torque (and thus finally the speed) of three-phase AC electric motors. This involves calculating an estimate of the motor’s magnetic flux and torque based on the measured voltage and current of the motor.
Is there a difference between high rotation speed and high torque?
Torque relates to the rotational force of an electric motor while speed refers to the rate that the motor can rotate. This means that torque is associated with rotational force while speed relates to the rate of rotation which can be calculated by examining the RPMs, or revolutions per minute.2021-11-22
How is torque controlled?
The logic-based torque ramp technology uses a control algorithm to maintain constant acceleration and deceleration torque. Motor voltage, motor flux, current and voltage zero-crossing are used to determine the torque and power factor.
How is an AC motor controlled?
An AC motor controller is known as the device that controls the speed of the AC motor. An AC controller can also be referred to as a variable frequency drive, adjustable speed drive, frequency converter and more. The AC motor receives power, which is converted by the AC motor controller into an adjustable frequency.
What does motor torque depend on?
This means that the motor torque TM depends only on the armature current I, TM = cI [Eq. (11)]. Dynamic braking is performed by switching the armature connection from the source to an external resistor, while the field winding remains connected to the source (Fig.
What is Torque Control in Robotics?
Torque sensors are used in space robot joints to increase robot capabilities and operational flexibility. Cascaded to a load position loop, a torque loop increases the performance of a position servo facing large variations of load inertia, typical of space robot arms.
What is DTC control of induction motor?
Direct torque control (DTC) is an emerging technique for controlling PWM inverter-fed induction motor (IM) drives. It allows the precise and quick control of the IM flux and torque without calling for complex control algorithms. In principle, moreover, it requires only the knowledge of the stator resistance.
What makes torque increase?
Similarly, the torque produced by a motor can be increased or decreased through the use of gearing. An increase in torque comes with a proportional decrease in rotational speed. The meshing of two gear teeth can be viewed as equivalent to the interaction of a pair of levers as shown in Figure 5.
What is the benefit of high torque motor?
Torque motor performance advantages This technology enhances productivity, accuracy, and dynamic performance of applications. Direct drive lowers costs, makes designs slimmer, and reduces wear and tear. Torque motors eliminate the need for mechanical transmissions like gearboxes, belts and speed reducers.
How does an AC motor produce torque?
The rotating magnetic field cuts the rotor bars and induces a current in them. The rotor current produces a magnetic field which interacts with the stator field, producing an accelerating torque.
How is torque controlled in a DC motor?
To control DC motors torque, a DC drive will regulate armature current. The armature voltage is unregulated allowing the motor to operate at whatever speed is necessary to achieve the set current /torque level.
How does direct torque control work?
Direct Torque Control (DTC) is an optimised AC drives control principle where inverter switching directly controls the motor variables: flux and torque. The measured input values to the DTC control are motor current and voltage. The voltage is defined from the DC-bus voltage and inverter switch positions.
How is torque controlled in a AC motor?
The torque control as well as speed control is obtained using induction motors fed from variable frequency inverters. The inverter is controlled such that the motor operates with constant flux, to achieve the best possible torque capability of the motor. Both voltage source and current source inverters can be employed.
What makes a motor high torque?
A high torque motor is toroid shaped, like a donut, and thus has a large diameter and short axis. These motors can directly drive the application without additional mechanics, like worm wheels, belts or pulleys.