Brushless Direct Current (BLDC) Motors
Compact & Precise
Brushless Direct Current (BLDC) Motors
A brushless direct current (BLDC) motor uses direct current from a power source, and a motor driver (inverter) to generate a rotating magnetic field which interacts with the permanent magnets of the rotor. The inverter typically uses pulse width modulation (PWM) to turn the DC voltage on and off in each phase wire, creating an alternating current which then moves the magnetic field. This means that there is no physical contact between the stator and the rotor, as it would be on a brushed DC motor.
Alva’s SlimTorq™ brushless direct current motors work precisely in this manner. The manufacturing technique called FiberPrinting™ allows for the creation of compact and precise slotless stator windings. These stators are combined with halbach array rotors, which not only generates a power dense BLDC motor, but one that also has a very clear sinusoidal back-EMF. This allows for precise and efficient movement of the rotor, with changes in the PWM duty cycle.
SlimTorq Brushless Direct Current (BLDC) Motors
Alva’s standard SlimTorq™ brushless direct current (BLDC) motors come in many sizes. The biggest one has an outer diameter of 160mm, and the smallest one just 25mm. The motors are configurable with different sensors (hall effect and NTC thermistor) and the phase cable termination can be placed either radially or axially. There is also the option to choose either a more lightweight alternative (L) or a more power dense one (M) as well as adapt the winding configuration to match the required torque constant. This would allow for most projects to be able to find a suitable motor option.
To find out more about our standard products, please have a look at our product catalog or in the product selector.
Custom Brushless Direct Current (BLDC) Motors
The versatile FiberPrinting™ manufacturing technique makes it possible for custom brushless direct current motors to be designed. Simply by changing the winding configuration, the length and the height of the printed stator mats, a completely new stator design can be manufactured. And when also changing the numbers and sizes of the magnets used in the rotor, a completely new motor design can come to life. This also allows for customization and optimization, which in the end means that most special requirements can be met.
If this is of interest, please contact us to discuss it in detail.
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Alva’s SlimTorq™ brushless direct current (BLDC) motors covers a range of options, and the table above shares some of the specifications. It’s important to mention that if more information is needed, or if there are questions, please contact us and we will help out to find the best solution.
Brushless Direct Current (BLDC) Motor Applications
Alva’s brushless DC motors can be used in many types of applications. With their compact size, large inner diameter, low weight and high power density they fit most applications where an efficient design is required. They are also frameless, which makes it possible to design them directly into the application, increasing the level of integration. Typical application areas are:
- Gimbals and other optoelectronic systems
- Humanoids and other legged robots
- Cobots and other robot arms
- Exoskeletons
- Robot surgery equipment
- UGVs
Normally 6-8 weeks is to be expected.
Please have a look in our productcatalogue, our product selector, or reach out to discuss your inquiry with us.
When specifications are set it takes about16-20 weeks to first deliveries.
Yes, both a NTC temperature sensor, orhall-effect sensors can be included.
For these motors, sine wave motor drives withField-Oriented Control (FOC) work best.
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