Technical

The motor and motor control markets are thriving in a number of areas, particularly medical and robotic applications. Also, there is a rich demand for small, efficient, high- and low-torque, and high- and low-power motors in the automotive sector. These applications can choose from brush dc motors, brushless dc (BLDC) motors, or a combination of both. Most motors operate in accordance with Faraday’s law of induction(see here). Still, there are key differences between these motors and in the employment opportunities that await them. Brush DC MotorsAround since the late 1800s, dc brush motors are one of the simplest types of motors. …

What’s The Difference Between Brush DC And Brushless DC Motors? Read More »

Stepper motors are different from ordinary DC motors in at least four important ways. The first difference you notice is that they have no brushes or commutator (the parts of a DC motor that reverse the electrical current and keep the rotor—the rotating part of a motor—constantly turning in the same direction). In other words, stepper motors are examples of what we call brushless motors. (You’ll also find brushless motors in many electric vehicles, hidden away in the wheel hubs; used in that way, they’re called hub motors.) The second major difference is in what rotates. Remember that in a basic DC …

What exactly is a stepper motor? Read More »

Advantages: Low cost for control achieved High torque at startup and low speeds Ruggedness Simplicity of construction Can operate in an open loop control system Low maintenance Less likely to stall or slip Will work in any environment Can be used in robotics in a wide scale. High reliability The rotation angle of the motor is proportional to the input pulse. The motor has full torque at standstill (if the windings are energized) Precise positioning and repeatability of movement since good stepper motors have an accuracy of 3 – 5% of a step and this error is non-cumulative from one …

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There are two basic winding arrangements for the electromagnetic coils in a two phase stepper motor: bipolar and unipolar. 4 Wires: Bipolar only5 Wires: Unipolar only6 Wires: Universal8 Wires: Universal Unipolar and bipolar is the type of connection each motor.The only difference is that bipolar can not be connected as unipolar (because it has only 4 wires) ,but unipolar can be connected ae bipolar. Bipolar stepper motorsBipolar motors have a single winding per phase. The current in a winding needs to be reversed in order to reverse a magnetic pole, so the driving circuit must be more complicated, typically with …

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Holding torqueA stepper motor’s holding torque is the amount of torque needed in order to move the motor one full step when the windings are energized but the rotor is stationary. Holding torque is one of the primary benefits that stepper motors offer versus servo motors and makes steppers a good choice for cases where a load needs to be held in place.Holding torque is typically higher than running torque, and is limited primarily by the maximum current that the motor can withstand. From a practical standpoint, holding torque is the sum of the magnetic force exerted by the coils to hold …

What’s the holding torque and detent torque of the stepper motor? Read More »

Full Step This method of stepping the motor energizes both phases constantly to achieve full rated torque at all positions of the motor. If a stepper motor has 200 steps, one pulse equals one step. So, 200 pulses from the NC computer results in 360 degrees of motor shaft rotation. A unipolar stepper motor driver operating in full step mode energizes a single phase. A bipolar stepper motor driver energizes both coils to make a full step. See the images below. The first image is single coil full step operation while the second is dual core full step mode.  Half Step The …

What’s full step and half step of the stepper motor？ Read More »

In brushless motors and speed control, you have two different types: SENSORED & SENSORLESS. Sensored motor as a sensor to help the sensored speed control know the orientation of the motor shaft. Sensor brushless motor systems always know the position of the rotor, which is especially critical at low speed as well as during the start condition when there is no rotor movement. Sensor brushless motors are often used in applications where starting torque varies greatly or where a high initial torque is required.  For the sensorless brushless motor, in contrast, a sensorless speed control does not know the position of …

What are the sensored and sensorless brushless motors? Read More »

Brushless DC motors have many advantages versus the brushed DC motors which are: Longer Life which the the only thing to affect the life of the brushless dc motor is the bearing’s life. No maintenance because there are no brushes and physical commutator. More efficient. High reliable. High speed which can operate at speeds above 10,000 rpm in both loaded and unloaded conditions Less noise because its internal parts are completely enclosed.

Components Brief Introduction 1: Flange2: Shaft3: Front Bearing4: Circlip5: Rotor (lamination stack)6: Stator Winding7: Stator Core8: Rear Bearing9: End cap10: PCB11: Magnets12: End Cover

Components Brief Introduction 1: Flange2: Shaft3: Front Bearing4: Circlip5: Commutator6: Armature Winding7: Armature Lamination8: Housing and Stator Magnet9: Rear Bearing10: Brush and Brush Holder Assembly11: End cap

Components Brief Introduction 1: Flange2: Front Bearing3: Rotor Core4: Permanent Magnet Steel5: Rotor Core 6: Winding7: Shaft8: Stator Core9: Rear Bearing10: Wave Washer11: End Cap