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  • HG-MR73BK伺服电机快来体验吧

    详细信息

     品牌:三菱  加工定制:否  型号:mitsubishi  
     额定功率:0.1-75 KW 额定电压:100-400 V 额定转速:1000-3000 rpm 
     扭矩:0.1-20  速度响应频率:50-60HZ   

    HG-MR73BK伺服电机快来体验吧

    交流伺服电动机在没有控制电压时,定子内只有励磁绕组产生的脉动磁场,转子静止不动。当有控制电压时,定子内便产生一个旋转磁场,转子沿旋转磁场的方向旋转,在负载恒定的情况下,电动机的转速随控制电压的大小而变化,当控制电压的相位相反时,伺服电动机将反转。

    GRAS 147AX CCP Rugged Pressure Microphone

    A new paradigm for engine noise testing

    Growing customer expectations increasingly push for noise-reduced cars. Therefore, OEMs continuously struggle to identify and reduce noise sources. Also, the increasing pressure for fast prototyping and shorter “time-to-market” calls for improved and more efficient noise, vibration and harshness (NVH) test methods. Generating reliable data is critical in this process, and it requires using the best measurement microphones as well as constantly improving the measurement procedures.

    This is why GRAS has developed a new surface microphone optimized for cold and hot engine measurements.

    The 147AX Pressure Rugged Microphone has been specially designed to achieve repeatable measurements in positions that are hard to reach with other types of microphones. This makes it a perfect choice to place in the response positions for TPA measurements in the engine bay of a car. Its small and rugged design allows for microphone mounting in places that were otherwise impossible. Furthermore, the magnetic base of the 147AX enables easy positioning on any metal surface and the included mounting disc will ensure the exact same microphone position for future measurements.

    GRAS 147AX operates in the -40 to 125 °C (-40 to 257 °F) temperature range and is designed to be water and dust proof (IP67). It therefore, will survive even the most challenging engine bay environments.

    Learn more about the challenges in NVH testing and how to select the right microphone

    Freq range: 3.15 Hz to 20 kHz 
    Dyn range: 19 dB(A) to 133 dB
    Sensitivity: 45 mV/Pa  
    Temperature: -40 to +125°C 
    Humidity: 0 – 90% 
    IP67

    Technology

    Introduction

    147AX is a rugged surface-mounted pressure microphone optimized for engine compartment testing in the automotive industry. It combines the high precision and stability of a laboratory microphone with a high level of ruggedness, including the ability to function properly in the most challenging environment with vibrations, oil mists, water spray and dirt and dust - and high temperatures up to 125°C.

    With the 147AX it is now possible to introduce a considerable improvement in the way acoustic engine compartment measurements can be done. The small form factor makes it possible to place the microphones where size constraints previously prevented so. Also, the microphone system's resistance to heat, dirt, oil mists and vibrations make it possible to make hot engine tests under real life conditions. A novel mounting system (MagMountTM) makes it easy to mount precisely and ensures very good repeatability, even after full dismounting of the microphones.

    HG-MR73BK伺服电机快来体验吧

    Design

    Like other members of the GRAS family of microphones for automotive NVH testing, the 147AX is designed to perform optimally under the rough conditions encountered in automobile NVH testing.

    The most important design features to accomplish this are:

    Vibration resistant and rugged

    A new design of the preamplifier and other internal parts makes it resilient to shock and vibrations.  It functions well under conditions with vibrations and g-forces from uneven road surfaces and other sudden directional shifts as encountered in real-life driving tests.

    The most vulnerable part of any condenser microphone is the diaphragm. In the 147AX a more robust type is used. It can be replaced during repair, keeping maintenance costs at a minimum.

    Temperature resistant

    The microphone set works properly up to temperatures of 125°C/257°F. The integrated cable is a high-temperature type. This means that the 147AX can be mounted closely to heat-emitting components and will provide reliable data in all realistic use scenarios.

    Effective protection

    The microphone-preamplifier assembly is effectively sealed against moisture and is IP67 rated. Special protective water and oil repellent coating adds further protection and makes it easy to clean.

    The microphone diaphragm is protected by a grid which has a comprehensive multi-layer filtering system which ensures good protection against high-velocity particles and prevents dirt and dust from polluting the microphone. Provided that the protective grid is replaced at appropriate intervals this system ensures that the microphone will function properly even in very dirty conditions. The filter also protects the diaphragm against water splashes and oil mists.

    A customized wind screen is available. Even when turbulence is not a problem it can be used for further protection.  

    Robust cabling

    A special connection system with added strain relief is used to provide a robust and water tight connection (IP67) and is sufficiently robust to endure the intended use scenarios. The cable can withstand temperatures up to 125°C/257°F and is oil resistant - if subjected to oil the insulation will not become brittle. The cable and its connection to the microphone are resistant to even heavy vibrations.

    A number of cable replacement kits are available for user replacement of the cable. In this way, possible downtime is reduced.

    Easy and repeatable mounting - MagMountTM

    Compared to traditional, tube-shaped 1/2" microphone sets that are mounted with tape or holders attached to the engine and/or its auxiliary equipment, the 147AX is a surface-mounted microphone designed to be mounted on flat or lightly curved surfaces, for example on the engine compartment walls/boundaries. This normally requires mounting methods that make dismounting difficult and potentially destructive, for example glue. Such methods can of course still be used, but the new magnetic mounting system called MagMountTM  is much easier to work with and provides the basis for better measurement results.

    The MagMountTM mounting system consists of a flat metal disc which functions as a mounting base for the microphone, and a magnet at the rear of the microphone housing. The flat metal disc is for mounting at the designated mounting point and can be secured with glue, double-sided bonding tape or a screw. Using the double-sided bonding tape delivered with the 147AX ensures an extremely strong mounting, but using glue may also be a good choice.

    147AX NY

     

    When the microphone is placed over the mounting disc, a center guide ensures that the microphone will be attached and centered to the disc correctly once the magnetic force kicks in. In this way, it is easy to mount in difficult-to-access locations with no loss of placement accuracy.

    This mounting system makes it possible to mount and dismount the microphone repeatedly even in difficult-to-access spaces where you cannot see what you are doing. When a microphone is dismounted and later remounted, the difference between these two mountings will be only a fraction of a millimeter. In this way, variations in transducer position from test to test are minimized, ensuring very good repeatability even if all microphones have been dismounted between measurements. Also, transducer placement inaccuracies due to operator error are no longer a problem.

    This system makes it easy to document how microphones have been placed during a given test, and it makes it possible to identify and prepare measurement positions at an early stage, e.g. before the room in which they will be used is finally assembled.

    Combined with the 147AX's ruggedness - in this case, its ability to handle heat and vibrations - this also makes it possible to retain a measurement setup with the same measurement points, even when transitioning to hot engine testing and prolonged testing on proving grounds or public roads.

    Even though the microphone will be firmly attached to a vibrating structure, this fact will not prevent proper operation. The microphone itself and all interior parts are designed to work correctly when vibrating. Furthermore, the diaphragm is extremely lightweight with a very small mass. This means it will not react to the vibrations in the same way as an accelerometer at the same location would. Below its resonance frequency at 18kHz, the low mass and high stiffness of the diaphragm reduce the influence of structure born vibrations. Even at the resonance frequency at 18kHz, the dampening is sufficient to prevent a peak similar to that found in accelerometers.

    Compared to using traditional tube-shaped microphone sets attached with tape or holders, 147AX’s mounting method is much more stable AND less sensitive to vibrations.

    Therefore, at the noise levels expected to be found in the engine bay, the 147AX provides a good signal-to-noise ratio even when mounted on a vibrating structure.

    Small form factor

    As a surface-mounted microphone, the 147AX can be used where a traditional 1/2" microphone set is too big. Low height allows for placement in difficult-to-access small cavities and near hard reflective surfaces, making it possible to install a microphone where a traditional ?” microphone set is too big to use. As modern engine rooms normally are densely populated this can be a major advantage.

    This advantage makes it easier to define microphone placement and to have identical setups over a long time and across models to document the effects of changes. Also, it will often be easier to place microphones close to the individual noise sources that need to be investigated.

    Pressure-field response

    The 147AX is a pressure microphone. Where a free-field microphone is designed with a high-frequency roll-off to compensate for the effects of its own presence in the sound field, the response of a pressure microphone is flat. Therefore, when mounted at the boundaries of the sound field inside the engine compartment, a low-profile pressure-field microphone is the better choice, especially at high frequencies.

    Windscreen

    A special windscreen is available for 147AX and can be a viable option when it is placed in close proximity to air flow, e.g. a fan.

    Integrated power LED for status indication

    An integrated LED gives status information on power up and checks, making it easy to verify that the microphone is ready to measure. If there is a faulty connection, the LED will not be lit during power up. The LED will light up when the TEDS chip is read.

    HG-MR73BK伺服电机快来体验吧

    Benefits

    The comprehensive precautions taken to make the 147AX immune to adverse test conditions result in a number of benefits that all translate into time saved and lower costs of ownership. The total life span of the microphone set will be many times that of a conventional microphone set that must be discarded due to damage from dirt, moisture, shock, and vibrations. Also, system and set-up related costs are minimized due to the precise and easily reproducible location of the microphones enabled by the MagMountTM mounting system that makes well-defined measuring points and highly repeatable measurements possible.

    • The 147AX is a pressure microphone. Unlike a free-field microphone, it will not underestimate the sound pressure in the pressure-field conditions inside an engine bay.

    • The same microphone set can remain mounted in a test configuration for extended periods of time or remounted very quickly.

    • Measurement points can be identified and described precisely.

    • Measurement setups can be recreated easily and precisely, ensuring very good repeatability between measurements.

    • Separate test results are immediately comparable because the same stable microphones are used at the exact same positions.

    • TPA and hot engine measurements can easily be compared.

    • The protection grid with its protective filters can easily be replaced, for example before dirt and oil mists are clogging the meshes.

    • The CCP (Constant Current Power) technology allows for a low cost per measurement channel.

    These advantages mean that the 147AX not only ensures a low cost of ownership, but will also contribute to speeding up the development process by improving the quality of your measurements and reducing set-up time, factors that translate into competitive advantages.

    Compatibility

    The 147AX requires a constant current of 2 mA and a BNC connector. Ready to use standard coax extension cable assemblies of various types and lengths are available. Waterproof, heat and chemical resistant extension cables are also available. It is IEEE 1451.4 TEDS v. 1.0 compliant. If your measurement platform supports Transducer Electronic Data Sheets (TEDS), you will be able to read and write data like properties and calibration data.

    System Verification

    The integrated PowerOn indication and the functionality of TEDS are very useful to determine which microphone is connected to which input channel. However, it is not a check of whether the microphone is within specifications or not.

    For daily verification and check of your measurement setup, we recommend using a sound source like the GRAS 42AG Multifunction Sound Calibrator with the calibration adapter that is part of the delivery.

    Calibration Data

    Calibration Data for each individual microphone set can be accessed online via the serial number. In this way, you can easily download and configure your analyzer with calibration data. Accessible on-line are also correction data for the protective grid in a format that your analyzer can read at www.gras.dk/e-data.

    GRAS HALT

    When our R&D team develops a measurement microphone, it must undergo the most demanding tests to prove that it can withstand our customers' daily test conditions. Using a series of Highly Accelerated Lifetime Tests (HALT) we ensure that our microphones live up to the high quality and precision that our customers have come to expect and trust. Our HALT tests actively accelerate the lifetime of a microphone by simulating the handling and use it is exposed to in real life situations. By stress testing to the limits, we have been able to optimize the design for robustness and stability.

    Service, Warranty and Repair

    When leaving the factory, all GRAS microphones have been calibrated in a controlled laboratory environment using traceable calibration equipment. Depending on the use, measurement environment and internal quality control programs we recommend that the microphone is recalibrated at least once a year.

    We offer two kinds of calibration as an optional after-sales service: GRAS Traceable Calibration and GRAS Accredited Calibration.

    GRAS Traceable Calibration is a traceable calibration performed by trained personnel under controlled conditions according to established procedures and standards. This is identical to the rigorous calibration that all GRAS microphones are subjected to as an integral part of our quality assurance.

    GRAS Accredited Calibration is performed by the GRAS Accredited Calibration Laboratory that has been accredited in accordance with ISO 17025 by DANAK, the Danish Accreditation Fund. If you want a new microphone set delivered with an accredited calibration instead of the default factory calibration, please specify this when ordering.

    All parts are manufactured and assembled at the factory in Denmark by skilled and dedicated operators in a verified clean-room environment. Our warranty against defective materials and workmanship is 5 years.

    147AX is patended in Europe.

     

     

    Specifications

    Frequency range (±1 dB)
    Hz
    5 to 12.5 k
    Frequency range (±2 dB)
    Hz
    3.15 to 20 k
    Dynamic range lower limit with GRAS preamplifier
    dB(A)
    19
    Dynamic range upper limit with GRAS CCP preamplifier
    dB
    133
    Set sensitivity @ 250 Hz (±1.5 dB)
    mV/Pa
    45
    Set sensitivity @ 250 Hz (±1.5 dB)
    dB re 1V/Pa
    -27
    Output impedance
    Ω
    < 50
    Output Voltage Swing, min. @ 24-28 V CCP voltage supply
    Vp
    8
    Power supply min. to max.
    mA
    2 to 20
    DC bias voltage, typ.
    V
    16
    Microphone venting
    Rear
    Temperature range, operation
    °C / °F
    -40 to 125 / -40 to 257
    Temperature range, storage
    °C / °F
    -40 to 85 / -40 to 185
    Temperature coefficient @250 Hz, typical
    dB/°C / dB/°F
    -0.015 /-0.009
    Humidity range non condensing
    % RH
    0 to 90, non condensing
    Humidity coefficient @250 Hz, @ 40°C
    dB/25-90 % RH
    < -1
    Influence of axial vibration @1 m/s2
    dB re 20 μPa
    63
    Static pressure coefficient @250 Hz, typical
    dB/kPa
    -0.02
    TEDS UDID (IEEE 1451.4)
    I27-0-0-0U
    Connector type
    BNC
    CE/RoHS compliant/WEEE registered
    Yes/Yes/Yes
    Weight
    g / oz
    27 / 0.95

     

     

     

     

       HG-MR73BK伺服电机快来体验吧

    GRAS HALT Test Parameters*   

    Humidity 90%

    @40°C 48 hours

    Drop - vertical, attached to 2 kg load

    m 1.5

    Drop - tumbling 1 meter

    times 100

    Vibration - horizontal and vertical

    @8g 60 hours

    IP rating**

      IP67***

    *For a short introduction to HALT, see the section "GRAS HALT" above

    **International Protection Marking, IEC standard 60529.

    ***IP67: Totally protected against dust, protected against the effect of water of up to 1 m of submersion.

    IP test according to IEC 60529:2013 performed by DELTA - a part of FORCE Technology, Venlighedsvej 4, 2970 H?rsholm, Danmark. www.delta.dk

     

    147AX freq resp red

    Typical frequency response.

     

    Noise floor graf

    Typical  noise floor.

    GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.

    Dimensions

    GS0864

     

    Ordering info

    Included items

    GRAS 147AX CCP Rugged Pressure Microphone with 5m integrated BNC cable
    GRAS GR2172 Mounting Disc
    GRAS RA0391 Calibration Adapter for 147AX
    GRAS DB0481 Double-sided adhesive tape for mounting disc

     Optional items

    GRAS RA0390 Dust, Oil and Water resistant shock protection grid
    GRAS AA0107 1 m waterproof/high temperature BNC-BNC extension cable
    GRAS AA0108 3 m waterproof/high temperature BNC-BNC extension cable
    GRAS AA0109 10 m waterproof/high temperature BNC-BNC extension cable
    GRAS RA0393 Cable Replacement Kit, 5 metres
    GRAS RA0394 Cable Replacement Kit, 10 metres
    GRAS RA0395 Cable Replacement Kit, 20 metres
    GRAS RA0396 Cable Replacement Kit, Custom Length, metres
    GRAS AM0388-1 Windscreen
    GRAS AM0388-2 Windscreen, 5 pcs
    GRAS RA0392-1 MagMountTM Mounting disc (5 pack) for 147AX, including double-sided adhesive tape
    GRAS RA0392-10 MagMountTM Mounting disc (50 pack) for 147AX, including double-sided adhesive tape
    GRAS CA2300 Accredited Calibration

     交流伺服电动机的转子通常做成鼠笼式,但为了使伺服电动机具有较宽的调速范围、线性的机械特性,无“自转”现象和快速响应的性能,它与普通电动机相比,应具有转子电阻大和转动惯量小这两个特点。目前应用较多的转子结构有两种形式:一种是采用高电阻率的导电材料做成的高电阻率导条的鼠笼转子,为了减小转子的转动惯量,转子做得细长;另一种是采用铝合金制成的空心杯形转子,杯壁很薄,仅0.2-0.3mm,为了减小磁路的磁阻,要在空心杯形转子内放置固定的内定子.空心杯形转子的转动惯量很小,反应迅速,而且运转平稳,因此被广泛采用。


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