in the case of a permanent-magnet motor. Torque can be controlled directly by controlling the armature current. … 10.8a, a phase-controlled rectifier, in combination with a dc-link filter inductor, can be used to create a variable dc-link current which can be applied directly to the armature terminals of the dc motor.
What determines torque in a DC motor?
In a DC Shunt motor: Torque is directly proportional to armature current. In a DC Series motor: Torque is directly proportional to square of armature current. In a DC Shunt motor: Torque is directly proportional to armature current. In a DC Series motor: Torque is directly proportional to square of armature current.
Which parameter controls the torque of a DC motor?
Here, again, the torque of a dc motor (usually a permanent-magnet or a shunt type) is controlled independently of speed. This is achieved with current feedback.
What is motor torque control?
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.
What controls a DC motor?
Thus, the speed of a DC motor can be controlled in three ways: By varying the supply voltage. By varying the flux, and by varying the current through the field winding. By varying the armature voltage, and by varying the armature resistance.
Which is proportional to the torque in dc motor?
1 Answer. The torque, in a DC series motor is proportional to the square of the armature current.
How do you increase the torque of a DC motor?
To increase the torque … that a bit harder. All you can do, electrically (as you can do it mechanically via gears), is to reduce the source impedance to maximise the current that can be delivered for a given stator impedance. Rewind it with more turns of thinner wire.
How do you control speed and torque of 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 do you identify a DC motor?
Look for the commutator & brushes and salient field system to confirm. (iii) has 5 terminals, then it is a AC synchronous motor (3 for stator and 2 for field). Look for 2 slip rings for rotor dc supply. (iii) has 4 terminals, then it may be a DC motor, in which case look for the commutator & brushes to confirm.
What is the function of torque controller?
The torque control function is in charge of closing the torque loop, or in other words, it ensures that the controller is generating the torque demanded by operation modes at all times. When working in profiled torque mode, this loop uses the output of the profiler directly after passing through the stop manager.
How do you control torque in a motor?
- Torque can be controlled directly by controlling the armature current. Fig. …
- In Fig. 10.8a, a phase-controlled rectifier, in combination with a dc-link filter inductor, can be used to create a variable dc-link current which can be applied directly to the armature terminals of the dc motor.
- In Fig.
Why is torque control important?
Controlling torque is essential for companies to ensure their product’s quality, safety and reliability isn’t compromised. The failure of a three-cent fastener that isn’t properly tightened can lead to catastrophic or latent failures.
What is the basic principle of direct torque control method?
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 can we reduce rpm of dc motor?
A couple of things you can do:
- Use gears to change ratio of speed, which is what you’re going to do. …
- Use a stepper motor, which are commonly used for high-torque, low RPM applications.
- Find some sort of PWM control circuit to slow it down, although you probably won’t be able to get it down to 5-10RPM.
Which is not part of a DC motor?
The correct answer to the question will be compass i.e compass is not a part of a DC motor. Various parts of a DC motor are coil of wire, armature, field magnets, brushes and commutator.
What are the 3 types of DC motors?
Main Types of DC Motors
- Permanent Magnet DC Motors. The permanent magnet motor uses a permanent magnet to create field flux. …
- Series DC Motors. In a series DC motor, the field is wound with a few turns of a large wire carrying the full armature current. …
- Shunt DC Motors. …
- Compound DC Motors.