mudikouke3211
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For stepper motor specification, the operating temperature range for stepper motor should be 0～50℃ while humidity should be 20%～90%RH, and storage temperature should be -20～70℃ while humidity should be 15%～95%RH. Now, environmental requirements for stepper motor usage are as follows:
Requirements on Temperature:
The standard of stepper motor insulation material is grade UL B, which indicates that heat resistance of motor insulation system is within 130℃. In consideration of motor temperature difference between inside and outside and safety coefficient, the surface temperature of motor is required below 100℃. In consideration of the normal room temperature within 40℃, temperature rise of motor coil should be controlled within 80K. If the temperature of motor coil is beyond the limit value of insulation system, the elements in it, such as enameled wire of motor coil, insulation slot, PCB board, etc. may be burnt out easily, resulting in motor failure (generally, open circuit occurs, sometimes, short circuit also occur).
re realistic selection is to control the temperature rise of motor, which is to achieve the aim by strengthening the heat dissipation conditions or reducing the operating current of motor.
The condition that the temperature of stepper motor is too high will not only affect the safety of insulation system, but also affect the stability of permanent magnet. The permanent magnet will be demagnetized as the temperature rises, reducing the working torque.
Requirements on Humidity:
The nema 17 stepper motor should meet the humidity requirements, which is mainly to avoid the condensation in motor. Silicon steel plates on rotor outer surface and stator inner surface of stepper motor has no other anti-rust measures except anti-rust oil application during processing. If the humidity is too high, condensation occurs easily on surface, causing rust. Because the clearance between rotor and stator of stepper motor is very small, the rusty spots may make rotor be seized, resulting in motor failure. On the other hand, the condition that humidity is too high can also affect the insulation characteristic of insulation material, which has little effect on small size stepper motor whose normal operating voltage is very low while has noticeable influence on those stepper motor whose drive voltage is high.
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mudikouke3211
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Q: What advice do you offer to practices looking to transition to LED lighting?
A: Dental led light has become a viable alternative to the fluorescent lamp (bulb) in the last year. Until now, the LED was costly, technically challenged by ineffective heat dissipation, and too blue/cool for most users expecting to replicate the warmth of incandescent. In the last year we have begun to specify LED “tape lighting strips†in uplighting coves, LED recessed cans in corridors and LED strip or stick lighting under upper cabinets.
Q: How can dentists make educated decisions as to whether operatory lights or headlights are best for them?
A: Headlights have definitely expanded in use and in preference by dentists. As with any technology, the complaints associated with headlights when first introduced —heavy, bulky and awkward in use—have subsided with again, advancing technology of the “fixture†type. Even so, we have not eliminated the combination of room illumination lighting and dental patient light from the operatory. In fact, orthodontics and pediatric dentists that would forgo the dental light entirely are introducing them into their treatment areas with expanding procedures requiring good field of vision (or good light).
Q: Do you believe it’s a good idea to have windows/natural lighting in operatories?
A: Absolutely. Shade matching may still be a driver for windows in some practices. We recommend windows to promote patient comfort and provider productivity. Working in a windowless environment all day has been shown to decrease productivity and increase stress in the dental environment.
Q: What are possible solutions when a north orientation is not possible or if the operatory can not have windows?
A: When north orientation is just not possible, then we recommend roller shades (Mecho or NYSAN) that allow visibility to the exterior but minimize glare and heat gain. If no windows are possible then we definitely recommend a mix of lighting, task and ambient, to create options of light during the course of the day to create change and add comfort.
Q: What else should clinicians consider in regards to lighting?
A: Most important: Don’t use the same light source throughout your office. Select lighting based on functional and esthetic criteria for each space. Too many dental offices have 2x4 fluorescent lighting in every space and lose any benefit that a mix of lighting can offer. Specifically, a recessed fluorescent light fixture is appropriate over a task area (operatory, lab, sterilization), but is a poor choice for non task areas in creating ambient appeal in a space. Your patients and your staff enjoy and benefit from changes in lighting throughout the dental environment.
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