PeriomaticTM is a proprietary period-based frequency measurement technology developed by COCORESEARCH, a pioneer in the field.
- Equipped with Dynamic PredictionTM (hyperbolic prediction computation) and stop prediction.
- Ensures high precision and rapid response across startup, shutdown, ultra-low to high speeds, and sudden acceleration/deceleration.
- Provides reliable performance under all operating conditions.
Conventional Measurement: Frequency-Based
Calculates rotation speed by counting the number of pulses within a set gate time.
Common Problems with Frequency-Based Measurement
At low speeds:
■ Response lag: It is impossible to respond faster than the gate time.
■ Accuracy trade-off: Shortening the gate time increases the impact of 1-bit errors, reducing precision.
■ Ripple noise: Analog outputs suffer from ripple disturbances with every wave cycle.
Ex: Inability to respond per pulse
Even if pulses stop, the system must wait until the gate closes to update.
Ex: 1-Bit Error and Ripple Disturbance
Ripple Disturbance: Waveform fluctuations are known as ripples.
Even with constant pulse input, the output becomes unstable depending on the gate's closing timing.
Examples of Low-Speed Measurement
■ Wind Turbine Rotation
The turbine is spinning, but the output reads zero.
■ Shield Tunneling Machines
- Machine length: Approx. 9m
- Total weight: Approx. 600t
- Excavation speed: Approx. 7.5m/day (during main excavation)
If speed cannot be measured, two shield machines cannot meet correctly.
Periomatic Measures via Period
■ Determines the period using just 2 pulse inputs, eliminating 1-bit errors.
■ Eliminates ripple disturbances.
Solving Conventional Problems with Periomatic
Conventional Gating Method
PeriomaticTM Method
Cannot respond faster than gate time
Responds every single cycle
Short gate times cause 1-bit errors and low precision
No 1-bit error; period is determined by 2 pulses
Ripple disturbances occur in analog output
No ripple disturbances
Relationship Between Frequency and Period
As input frequency decreases, the interval (period) from the previous pulse lengthens.
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Measurement output decreases compared to the previous cycle.
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Periomatic's predictive logic calculates a rectangular hyperbola in real-time to lower the output smoothly.
Frequency and period are inversely proportional (f=1/T) This forms a rectangular hyperbola on Cartesian coordinates.
Operation Example: PeriomaticTM Mode A
The relationship between pulse input and F/V voltage output via Mode A logic is shown below. The pink area highlights the difference with and without Dynamic PredictionTM.
The results differ significantly.
*Note: Mode B also includes Dynamic PredictionTM, updated at every gate interval.
About PeriomaticTM Mode B
Measures the number of input pulses within an internal gate (output update time).
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Simultaneously measures the period of those pulses and calculates the total duration to determine the average.
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Divides the total duration by the pulse count.
↓ Enables measurement of the average period per pulse.
Mode B Operation: Comparison with Conventional Gating
Ex 1: Gate time 1ms, input pulse 1.5kHz
Ex 2: Fluctuating input frequency
Summary: PeriomaticTM Mode A vs. Mode B
PeriomaticTM offers Mode A (Response Priority) and Mode B (Accuracy Priority).
Mode A: Proprietary 1-Pulse Response
■ High-speed response (1-pulse response possible)
■ Acceleration: Tracks rapid changes via 1-pulse response
■ Deceleration: Precise calculation via Dynamic Prediction (hyperbolic prediction)
■ Stopping: Optimal stop prediction based on operating conditions
Mode B: Proprietary Gating Method
■ Time-averaging for extreme stability
■ High accuracy even with very short gate periods
■ Precisely measures and averages pulse counts and periods within the gate
■ Eliminates standard pulse-count errors; highly resistant to signal jitter
■ Deceleration: Predictive logic ensures high-precision, rapid response
Common Features: Modes A and B
■ Wide-range measurement ■ Superior ultra-low speed performance ■ High precision
PeriomaticTM technology enables detailed rotational analysis. COCORESEARCH has pioneered the field of "Rotation Analysis."
