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RPM 8000-DC

RPM measurement for DC engines via the power supply, The RPM-8000-DC was special developed for DC engine RPM measurements. This field of engineering becomes more important in the future regarding the low noise design of compact drives, e.g. in the automotive industry for electrical window opener, slide roofs and seat adjustments. The RPM-8000-DC will used on machines, where the drive shaft is not accessible or where conventional sensor mounting is to time and money expensive. The device will simply connected in series with the engine power supply, without any influence to it. Every transition between two successive collector lamellas generates a small fluctuation of the engine current. This variations will detect, cleaned from interfering pulses and noise, amplified and converted to a TTL compatible frequency signal, which is per design proportional to the engine RPM. Simultaneously a potentiometer adjustable linear analog output signal will generated. The sensor electronics will supplied from a separate voltage input in the range from 12 to 15V DC.

RPM-8000 DC

RPM measurement for DC engines via the power supply

rpm8000dc-front-m.jpg (26570 Byte)

RPM 8000 DC - Font

rpm8000dc-back-m.jpg (23709 Byte)

RPM 8000 - Rear

Short description

The RPM-8000-DC was special developed for DC engine RPM measurements. This field of engineering becomes more important in the future regarding the low noise design of compact drives, e.g. in the automotive industry for electrical window opener, slide roofs and seat adjustments. The RPM-8000-DC will used on machines, where the drive shaft is not accessible or where conventional sensor mounting is to time and money expensive. The device will simply connected in series with the engine power supply, without any influence to it.

Every transition between two successive collector lamellas generates a small fluctuation of the engine current. This variations will detect, cleaned from interfering pulses and noise, amplified and converted to a TTL compatible frequency signal, which is per design proportional to the engine RPM. Simultaneously a potentiometer adjustable linear analog output signal will generated.

The sensor electronics will supplied from a separate voltage input in the range from
12 to 15V DC.

Specifications for supported DC engines

Supply voltage range: 0 – 48V

Load current range: 0 - 10A or 0-80A

Digital frequency output

Frequency range: 5Hz – 10kHz

Pulse duty ratio: 0.4 – 0.6

Remaining jitter: » 0.25ms

Logic level: TTL

Signal relations: Output frequency [Hz] =

No. of collector lamellas *

Engine RPM [min^-1] / 60

Analog voltage output

Voltage range: 0 - 10V

Pot. adjustment range: 0 - 1V per 1000Hz

Output impedance: 2W, 10mA max.

Output ripple: » 1% of voltage value

(for 500Hz input frequency)

Sensor power supply

Input voltage: 12 - 15V

Supply current: » 65mA

Physical quantities

Dimensions: 105 x 105 x 65mm

(without connectors)

Weight: 930g

Environment conditions

Operating temperature range: 0 - 70°C

Storage temperature range: -20 - 70 °C

Humidity: 20 - 80%

non-condensing

Vibration: 5g Mil Standard 810C,

curve C

Shock: 10g in all directions

Datasheet PDF

User manual PDF

Application samples PDF