VSM025A series voltage hall sensor measurement line voltage, the sensor adopt closed-loop principle of hall effect, can in the case of isolation, the pulse, dc, ac and a variety of irregular waveform voltage for effective measurement, measurement range is Vp = 10 ~ 500 v. The application of magnetic coupling method, to measure the current application of LEM LA58 - of the companyP current sensor measuring the armature winding currents, this kind of sensor has many advantages, such as good linearity, wide frequency band, low temperature drift and strong anti-jamming etc. , it can measure the current of up to 50 a.
the output voltage and current sensor signal into a voltage signal through resistance, in the operational amplifiers OP27 voltage adjustment to the SCM can receive signals, at the same time, in order to make the single chip microcomputer of the input signal is worth to the limit, in setting diode limiter circuit, signal input sensor output and single chip microcomputer interface circuit is shown in figure 2.
2. Torque and rotational speed measuring
and running speed of the motor output torque is one of the important indicators to measure motor performance, the test system chooses CGNJ2801A type dynamic torque sensor measurements on rotating speed, torque, torque measurement range 0 ~ 100 n & middot; M, speed measurement range 0 to 4500 r/min, measurement accuracy is 0. 5%. The sensor adopts a set of ring transformer to provide power supply, using low-power signal coupler non-contact signal, static torque signals can be accurately and rotational torque signal. The output of the sensor is 4 ~ 20 ma, or 0 ~ 5 v analog signal, and then through the signal conditioning single-channel backwardness to MCU.
3. Dynamic virtual armature resistance test
brushless dc motor armature equivalent resistance R consists of three parts, coil, switch, and the reversing resistance, respectively, and according to the difference between dynamic and static, for stationary state, also can only with the coil resistance test, the dynamic test results for the three parts when resistance and, under the condition of dynamic to the armature resistance test, the result is more can highlight the performance of the motor.
brushless dc motor is obtained by computing the armature equivalent resistance, solved the problem of the cannot be directly measured, the formula is applicable to three-phase six-step brushless dc motor.
4. Temperature measuring
the motor shell and surface temperature of the rotor test examination important performance index of the motor running state and temperature test for the motor internal fault and temperature field analysis is of great importance.
in recent years the development of infrared temperature measurement technology, infrared temperature measurement technology using the pyroelectric effect to thermal signal into electrical signal, it has the sensitive reaction, wide temperature range, the advantages of analyte does not need to direct contact, in the field of motor temperature test also has a certain application. Choose OS136 - test system0 - V1 type of temperature sensor, the sensor output5 v dc voltage signal, the spectral response for 5 - distance14 microns, the response time of 150 milliseconds.
