Estimate Brush DC Motor Reliability With Confidence
When it comes to manufacturing advanced medical instruments, reliability is a critically important consideration for coreless miniature DC motors. To estimate a motor’s expected lifetime, manufacturers employ reliability tests to measure a motor’s survivability against typical stresses like torque, speed, temperatures and vibration. Because it can take months or years to test a motor’s resistance to these conditions, accelerated life testing (ALT) over an abbreviated schedule is often the most practical testing approach.
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Topics:
Brush DC Motors,
Portescap,
DC motors,
DC motor lifetime testing,
DC motor B10 reliability,
medical instruments,
coreless brush DC motors,
motor reliability analysis,
motor lifetime,
Weibull analysis,
Weibull distribution,
torque speed curve,
DC monitor reliability testing,
time-to-failure,
TTF,
DC motor B10 life
Motion System Options for HVAC Gas Valve Actuators
In HVAC systems that provide heat for enclosed spaces, gas and liquid flow must be controlled and metered accurately using sensing and modulating elements such as flow control valves or isolation valves. Some control valves are opened and closed manually at the valve stem, while electronic valves incorporate an actuator to move the stem with control from a motor and drive system. Designers have three motor types to choose from, depending on the application requirements. Here’s a summary of the motion system options:
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Topics:
Stepper Motors,
brushed DC motors,
Portescap,
DC motors,
motor selection,
electric damper actuators,
HVAC systems,
HVAC,
gas and liquid flow,
fluid control,
linear stepper motors,
actuators,
HVAC gas valve actuators,
position system,
rotary motion,
linear motion,
closed loop positioning
Motion System Selection Considerations for Wheeled Robots
As robots become an integral part of our lives in both industry and in our homes, wheeled robots will be at the forefront of the progression. Their motion systems usually consist of brushed or brushless DC motors coupled with compact planetary gearboxes. When selecting a motor and gearbox, you will need to determine both the product’s operating and maximum conditions and confirm the required speed and torque experienced at the wheel output. Here are some tips to consider to help with your selections:
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Topics:
miniature motors,
Portescap,
motion system,
brushless DC motor,
BlDC motor,
motor selection,
motor torque,
motor speed,
high torque density,
motor and gearbox,
planetary gearbox,
coreless motors,
compact motors,
long life motors,
wheeled robots,
brushed DC motor
Tips to Avoid Stepper Motor Resonance Problems
When an application requires a reliable, low-cost motor with simple operation, stepper motors can be hard to beat. They can be driven step by step without needing an encoder or Hall sensor for rotor position feedback. However, the same straightforward design and driving method that makes stepper motors popular can lead to resonance problems in certain conditions.
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Topics:
Stepper Motors,
Encoders,
Portescap,
prevent resonance,
synchronization,
holding torque,
friction,
braking torque,
positioning applications,
resonance,
avoid resonance,
damping,
commutation,
natural frequency,
avoid natural frequency,
inertia,
microstepping,
viscous friction
Understand What Factors Influence the Stall Torque of a Brushless DC Motor
Apply sufficient power to a brushless DC (BLDC) motor, and it turns. Remove the power, and it stops. But there is a condition in between where power is applied but the motor is not moving. This is a motor that is at stall. In this state, with power applied, it is very much a live motor; just because it isn’t turning doesn’t mean current isn’t flowing through the windings - actually just the opposite. At stall, an excess of current is flowing, heating up the motor coils; if stall conditions are maintained, or frequently repeated, these stresses can quickly add up to trouble.
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Topics:
Portescap,
Brushless DC motors,
motors,
coils,
design engineering,
motor drive package,
stall torque,
design considerations
Key Concepts For Running a Brushed DC Motor as a Generator
Although design engineers know that both brush DC and brushless DC (BLDC) motors can operate as generators, many tend to avoid running a brushed DC motor in generating mode because they believe this strategy is inefficient compared with motor use. Unfortunately, by avoiding using brushed DC motors as a generator, engineers pass up a number of benefits.
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Topics:
BLDC Motors,
Portescap,
driving torque,
miniature DC motors,
Brushed DC motor as a generator,
BLDC motor as a generator,
back-EMF,
power balance,
motor selection,
BLDC motor efficiency,
DC coreless motors
How To Select a DC Motor Coil Based on the Required Working Point and Power Supply
Although DC motors have a common operating principle, many applications — including portable medical devices like infusion pumps — require one that converts electrical energy to mechanical energy with the highest efficiency to achieve a long, reliable service life. This is typically where an ironless DC motor comes in.
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Topics:
Portescap,
DC motors,
ironless DC motors,
Portescap 16DCT ironless DC motor,
Athlonix ironless DC motor,
DC motor coil selection,
DC motors for portable medical devices,
high-efficiency DC motors,
motor coil selection
Motor Technology Selection: Evaluation Factors
Motors are usually an indispensable element of an application’s motion system. However, selecting the motor is rarely straightforward. Motor technologies all have characteristics that can impact a design in different ways, and will determine whether you choose a brushless DC, coreless DC or stepper motor. Here are some key considerations to help you choose an optimal motor for your application.
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Topics:
Portescap,
Brushless DC motors,
precision,
peak torque,
periodic duty cycle,
coreless DC,
motor technology,
product development,
speed,
lifetime,
mechanical envelope,
duty cycle
Improve Thermal Performance for Ironless Brush DC and Brushless DC Motors
Electric motor manufacturers must ensure that a motor’s instant internal temperature never exceeds its various components’ maximum allowable temperature. Depending on the design of the motor and the materials used, thermal phenomena will dictate the motor’s performance. Motor designers typically have two options to enhance motor performance without overheating and damaging its components: increase power conversion efficiency by generating less heat for a given mechanical power output or improve the motor's cooling capability through heat dissipation.
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Topics:
brushed DC motors,
Portescap,
Brushless DC motors,
DC motors,
iron losses,
power conversion,
heat dissipation,
spotless brushless motors,
motor design,
thermal management,
power losses,
temperature rise,
steady state operation,
heat transfer,
thermal resistance,
excessive temperature,
electrical resistance,
thermal conductivity,
transient operation,
peak torque,
periodic duty cycle
Understand the Effect of PWM When Controlling a Brushless DC Motor
Designers of motion systems often face challenges when selecting or developing electronics using pulse width modulation (PWM) to drive brushless DC motors. To avoid unexpected performance issues, it’s important to understand some of the basic concepts.
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Topics:
PWM drive,
pulse width modulation,
Portescap,
brushless DC motor,
DC motors,
PWM regulations,
PWM method,
PWM frequency,
chopper amplifiers,
ripple,
joules losses,
iron losses,
Faraday-Lenz law of induction,
linear amplifiers,
eddy currents
Choosing a Motor for Electronic Pipettes
When it comes to dispensing a specific volume of liquid in a lab environment, pipettes are essential. Electronic air displacement pipettes have taken the lead due to the needfor a high level of precision and accuracy required for repeated use over a periodof time. With the improvement of a digital interface for adjusting aspiration or dispensing, electronic pipettes offer a huge advantage and relief from ergonomic methods.
The motor is the key element in the design. When design engineers specify a motor they must consider factors such as motor power, size and weight, and control electronics. Let’s look at the two most considered motor options - stepper motors and DC motors to help determine the fit for your application.
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Topics:
miniature motors,
Stepper Motors,
Brush DC Motors,
Portescap,
brushless DC motor,
pipettes,
laboratories,
accuracy,
precision,
automated systems
