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The motor is of course an AC motor but in terms of the BEMF waveform shape it MAY (underlined!!) have been designed with a more trapezoidal BEMF which CAN (underlined!!) give a smoother torque compared with a sine BEMF and six step energisation. The current through the windings can be anything you want.

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BLDC motor. On the other hand, when the generated back EMF is sinusoidal, it is called a sine wave back electromotive force BLDC motor. As the name implies, the trapezoidal motor provides trapezoidal power in a trapezoidal manner and the sine wave motor's back electromotive force is sinusoidal. In addition to counter-electromotive force, phase ...

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In a brushless DC motor (BLDC) the coil windings are on the fixed part (stator) and the permanent magnets are fixed on the rotating shaft (rotor). Although their rise in popularity is relatively recent, brushless motors have actually been around for more than 50 years.

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• Many types of commutation methods can be used for spinning a BLDC motor, depending on the motor type, application, and solution 3 Motor Type •Trapezoidal •Sinusoidal Application •Torque •Position •Speed Solution •Integrated Control and/or MOSFET •Sensored vs. sensorless •Acoustics, efficiency, etc.

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BLDC mode, although, in practice, it is desirable for a BLAC motor to have a sinusoidal back-EMF waveform and BLDC motor to have a trapezoidal back-EMF waveform in order to minimize the torque ripple and maximize the efficiency and torque capability. A sinusoidal back-EMF waveform can be obtained by skewing the stator slots and/or rotor magnets,

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motor. This makes the torque output by a sinusoidal motor smoother than that of a trapezoidal motor. However, this comes with an extra cost, as the sinusoidal motors take extra winding interconnections because of the coils distribution on the stator periphery, thereby increasing the copper intake by the stator windings. ROTOR

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BLDC to reduce the torque ripple. In this work the vector model based control of surface-mount permanent magnet synchronous machine with non-sinusoidal back-EMF is implemented considering second order sliding mode speed controller. i a e a e b i b e c i c 0 3 2 3 4 3 5 3 2 e T e Fig. 1. Brushless DC motor ideal electromagnetic torque generation ...

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The negative pulse is a negative half sine wave. Taken together, you end up with a continuous sine wave. Personally, the motors whose EMF I have looked at have not been very trapezoidal. They appear sinusoidal. Not sure how subtle the difference is between "trapezoidal" and "sinusoidal". \$\endgroup\$ – mkeith Mar 19 '19 at 19:37

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A brushless DC (BLDC) motor drive is characterized by higher efficiency, lower maintenance, and like Sinusoidal, multiple sinusoidal, 60 modulation higher cost. Therefore, it is necessary to have a low-cost etc. Here, sinusoidal PWM technique is used for but effective BLDC motor controller.
In simple terms, in a bldc u have the rotor which is the permanent maganet and its sets up the armature flux while the stator is fed by 3 phase supply to give us the field flux. u can do it by a PWM. there are some set relations for back emf and torque which can be found out from any literature. as matter of fact these 3 phase supply can be both square wave or sine... although former is preferred.
eliminate this, a sinusoidal wave must be utilized. In the industry today, whether it be robotic systems, space technology, automotive industry, computer systems and home appliances, Brushless DC, BLDC, motors are preferred over other motors. A BLDC motor is an AC synchronous electrical motor. The difference between a BLDC and a DC motor
A BLDC motor may have a trapezoidal Back EMF, there is something called Trapezoidal Motor Control Methodalogy (TRZ). TRZ is an extension of 6-step control with additional switching states generated to allow winding current to ramp up/down in each phase prior to/after each commutation instant.
BLDC Motors for electric vehicles - regenerative braking enabled for travelling extra miles. BLDC motors for e-rickshaw. BDLC motors for e-Auto. BLDC motors for electric bike. BLDC motors for electric cars/Mini-bus/Tractor. BLDC motors for Hybrid vehicles. BLDC motors for e-hydraulic. sine-wave and trapezoidal BLDC Controllers-----PMSM / BLDC ...

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Ebike Kit, Electric Bicycle, Electric Vehicle manufacturer / supplier in China, offering 200-1000W E-Bike Kit Brushless Motor, CE Approved High Power brushless BLDC motor 10kw up to 20kw 85 N.m 4000RPM Electric Motorcycle Motor kit / Electric motor for car conversion kit, EZ Outboard 3HP-10HP Leisure Models Pure Electric Propulsion Outboard Motor Electric Boat motor and so on.
You have a choice of trapezoidal and sinusoidal drive to consider, the later will have less torque-ripple. [ I will NOT respond to personal messages, I WILL delete them All the criteria you are giving us is for the use of a stepper motor. Do you know the difference between a BLDC and a stepper?But you can also apply FOC to a BLDC motor or a trapezoidal voltage(six step commutation to a PMSM motor. In both cases motor will turn (of course if you apply it right), but the torque ripple will be higher than other method. 3) If you try to have a motor with perfect trapezoidal shape, try to plot the BEMF vs electrical motor angle on a polar ...