Why do DC motors need a controller to control motor speed and output torque?

Why do DC motors need a controller to control motor speed and output torque?

A DC motor controller is a special type of electrical equipment that converts electrical energy into mechanical energy.

A DC motor receives electrical energy by utilizing direct current, and then converts this energy into the automatic rotation of the motor. DC motors are almost ubiquitous, they utilize a magnetic field created by the currents that drive a rotor fixed to the output shaft, and the speed and output torque depend on the motor’s design and electrical input.

How does a DC motor controller work?

DC motors vary in power and size and can be used in electric hoists and elevators, electric cars, and toys, depending on the mechanism. A DC motor consists of two basic parts: the armature and the stator. The stator is the stationary part of the motor and the armature is the rotating part. A DC motor uses, in addition to coils, a set of fixed magnets in the stator, with current flowing in the loops of the wires, creating an aligned electromagnetic field. One or more coil windings of insulated wire are wrapped around the core of the motor to concentrate the magnetic field. The windings of the insulated wire are connected to a rotary electrical switch (commutator), which continues to apply current to the coil windings. A rotating electrical switch allows each armature coil to be energized, producing torque or a steady rotational force. After the coils are turned on and off in sequence, a magnetic field is created that interacts with different areas of the stationary magnet, creating torque. These basic working principles allow DC motors to convert electrical energy from direct current to mechanical energy that can be used to propel equipment, all through rotational motion.

How does the DC motor controller work

Who Invented the DC Motor Controller?

DC motors are brilliant electrical devices that have revolutionized people’s lives in many different ways, but who invented the DC motor? Like all other innovations, a lot of people made a difference by developing other devices. In the United States, Thomas Davenport was the inventor of the first electric motor, and in 1837 Davenport was the first to patent a usable electric motor, however, Davenport did not Not the first to make a motor this way, as other inventors in Europe have developed more powerful motors earlier. Davenport is credited as the original inventor because he patented it earlier, in 1834 Jacobi Moritz had proposed a higher Power of the motor (three times the power). A year later, Sibrandus Statingh and Christopher Becker showed the motor in action.

Types of DC Motor Controllers and DC Motor Controls

Brushless DC Motor

Also known as synchronous DC motors or electronically commutated motors, the main difference between these types of motors is that they lack a commutator, which is replaced by a servo that can detect and then adjust the angle of the rotor, BLDC motors are robust and safe.

Brushed DC Motor

These are the earliest DC motors, dating back to the motor’s original design, and while they are still popular in paper machines, cranes, and rolling mills, they have faded more recently.

Parallel DC Motor

This is a brushed motor with the field winding in parallel with the armature, they have lower current due to the parallel winding, parallel motors find many uses in a variety of applications where constant torque is required, mixers, conveyor belts and cranes are the most depend on them.

Series DC Motors

These are the ultimate breed, the field windings connected in series distinguish them from parallel motors, which means that the armature current does flow through the field windings, resulting in faster speeds, series DC motors are tasks that require high starting torque Ideal.

When it comes to DC motor control, the following are the most commonly used methods:

Direction controller: H-bridge

An H-bridge circuit is one of the easiest ways to control a DC motor, four switches controlled in pairs can be found within such a motor, when either of the two pairs is closed, they immediately complete the circuit and subsequently power the motor, H The bridge can also control the speed.

Speed Controller: Pulse Width Modulation (PWM)

The PWM circuit changes the speed of the motor by simulating the increase or decrease of the power supply. PWM is easy to apply and inexpensive, which is one aspect of the motor speed that can be continuously controlled. These controllers work by sending periodic pulses to the motor, as if the motor is powered by high or low voltage when using the coil inductance of the regular pulse to bring a certain constrained smoothing effect.

Armature Controller: Variable Resistor

This is another way to affect the speed of a DC motor, the current fed through the armature or field coil changes. When the coil current changes, the speed of the output shaft also changes, and the variable resistor can change the current, which can increase the speed.

What to Know When Buying a DC Motor

Before buying a DC motor, there are some basic things to consider, here are some key factors to consider: the higher the energy, the higher the torque, the energy keeps the net current flowing in one direction, check the recommended DC motor pull in the instruction manual. Electric current powers the motor, too much of it is dangerous as it will damage the motor, make sure you understand its operating and stall currents before using a DC motor controller. Speed is a bit complicated in terms of motors, motors operate efficiently at high speeds, but that can’t be done if gearing is required, adding gears doesn’t limit the efficiency of the motor. Therefore, torque and speed reductions also need to be considered.

Why choose a DC motor?

When an AC motor is an option, a DC motor is highly recommended as the first choice, which has some advantages over an AC motor. For example, they are excellent when high starting torque is required for driving high inertia loads, and unlike AC motors, it is easy to control the speed of DC motors.

They are also ideal when DC motors need to be powered from a low voltage DC source such as solar panels or batteries. If you quickly reverse the direction, you’ll find that a DC motor works well. Unlike AC motors, DC motors can be started and stopped easily and quickly.

Applications of DC Motor Controllers

There are various DC motors on the market now, we use them widely, at home, DC motors can be used in toys, tools and other household appliances. In industry, their needs include running across carousels to conveyor belts, as well as reversing. DC motors are used to power pumps based on their excellent motion responsiveness and ease of shifting, and they are the first choice for fans due to their energy saving mechanism. DC motor toys have a variety of voltages and therefore require different types of movement and speed. DC motors for electric vehicles are preferred because of their durability and energy efficiency. Electric bikes have DC motors in both the rear and front wheel hubs to achieve the required power levels and torque.

Agent (Online)

We are here to help. Chat with us on WhatsApp for any queries.