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  • Users: boydli
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  1. boydli

    shock test failed

    Hello all, A ploblem is here that we need the parts strong at some level but can not too strong as bad effect. the failure appears when a sudden stop applied on drive shaft, then this shock torque from shaft will be transfered to a planetary reduction gear,then the gear will be broken. Between...
  2. boydli

    shock test failed as may material too strong

    Hello all, A ploblem is here that we need the parts strong at some level but can not too strong as bad effect. the failure appears when a sudden stop applied on drive shaft, then this shock torque from shaft will be transfered to a planetary reduction gear,then the gear will be broken. Between...
  3. boydli

    ripple current problem

    Hi all, I meet a problem on the ripple current of DC brush motor. First,our customer require that the RMS ripple current is between a maximum value and a minimum value. Second,the sum power of foundermental frequency has a minimum value(ratio,compared to the whole power). At last,the sum power...
  4. boydli

    2 hall sensor and 3 phase BLDC motor

    Hi all,I get a brushless permanent magnet motor used on autobike, with 2 hall sensor, but 3 phase of delta connection. its back EMF is sinusoidal well. And I know most of BLDC motor use 3 hall sensors to detect the rotor position and sent the signal into controller. also its back EMF is...
  5. boydli

    antiwater seal for high speed motor:11000rpm

    Hi,all I meet a problem of antiwater seal. The customer ask to protect the hign speed motor(duty: 11000rpm/8hours) from water. The test method is just putting the motor in water statically. the water height is OK when it can cover all of the motor.The testing time is 5 minutes. Many methods...
  6. boydli

    DC motor's spark grade have relationship with power lead?

    Hi, We meet a problem on a DC motor. We adjust the brush position OK by same speed at CW&CCW direction with non_load. But only one direction is OK if judged by spark and torque between brush and commutator bar with load on(15N.m/1000rpm). In aother direction the spark is very violent...
  7. boydli

    field map about Ia & If of DC motor(separate If)

    Hi all, i have a problem about the test method and calculation method of field map about the Ia(armature current) & If(separate pole winding current) of DC Motor.our customer need that field map. The field map is to describe the disabled working area by If & Ia curve. For example when If...

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