Additional information about motors
Rotational speed measurements of the electric motor
Although resolvers are one of the most precise options for measuring the rotational speed and angular position of the tested unit, resolvers are expensive and the signals require extensive conditioning. Many electric motors already have a built-in resolver directly connected with the motor control unit, which can be accessed for external measurements as well.
The RAD10 and RAD18 hardware extensions do not require an additional external resolver. Instead they are able to tap the existing resolver signal and convert it into a pulsed encoder signal. This signal can be directly connected to the TIS input of a TAS frontend. To minimize the interference of the engine resolver, the RAD uses a capacitively isolating amplifier close to the resolver.
RAD10 provides the highest precision for rotational speeds up to 30,000 rpm for resolvers with winding. RAD18 can be used with somewhat reduced accuracy up to 120,000 rpm, or for resolvers with quadruple winding up to 30,000 rpm.
RAD Amp Inputs
RAD Amp Outputs
RAD10 Decoder Inputs
RAD10 Decoder Outputs
RAD18 Decoder Inputs
RAD18 Decoder Outputs
Complete solution for electric motors
The RAD resolver decoder is another innovative module of the Discom complete solution for quality assurance of electric motors. With this hardware extension, Discom enables new and innovative applications for manufacturers of electric motors. The device works in combination with the Discom TAS frontends.
Measuring the rotational speed of eDrives and electric motors.
Additional important information about electric motors
- High-precision acquisition of the rotational speed of electric motors
- For testing without an external speed sensor
Can be used with TAS frontends or any DAQ system with pulse input
Detect and prevent production risks
- Hardware extensions for quality assurance of electric motors and eDrives
- Enables new applications in quality testing
- Higher reliability and fewer returns
Determine rotational speed from the current signal
The rotational speed of electric motors is an important element in the quality control of actuators for verifying manufacturing quality. The Discom CSA hardware extension determines the rotational speed of these small electric motors reliably and accurately from the current signal – a measurement that is not possible by sensor.
CSA front view
CSA back view
Testing of small and tiny electric motors of actuators, for example electrically adjustable car mirrors, electrical window lifters, windshield wipers, air conditioning units.
Rotational speed measurement without additional sensor
- Innovative indirect determination of rotational speed of small motors by means of the current signal
- No sensor required
- Quality assurance even in harsh manufacturing environments
Cost-effective testing in manufacturing
- Reliable quality assurance, even for small actuator motors
- Efficient cost-concious testing to increase the functional guarantee of actuators
Data sheet RAD10 / RAD18 (English)
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