Technical Information: What is Periomatic™?　　　>JAPANESE

What is Periomatic™

Periomatic™ is a proprietary period-based frequency measurement technology developed by COCORESEARCH, a pioneer in this field.
It features Dynamic Prediction™ (hyperbolic prediction computation) and stop prediction capabilities,
enabling high-precision and rapid response across various scenarios, including start-up, shutdown,
ultra-low to high speeds, and sudden accelerations or decelerations.


The conventional method counts the number of pulses within a gate time to determine frequency.

At low speeds, this method encounters several challenges:

■Response Limitation: Achieving a response faster than the gate time is not possible.
■Accuracy Reduction: Shortening the gate time increases the impact of single-bit errors, leading to decreased measurement accuracy.
■Ripple Disturbances: Analog outputs suffer from ripple disturbances, causing waveform irregularities even with consistent pulse intervals, due to the timing of gate closures.

Example: No response per pulse.

No more pulses are received after this, but you have to wait until the gate deadline.

 

Example: 1-bit error and ripple failure

Ripple Failure: Disturbance of waveform is called ripple.
Even if pulses are input at a constant cycle, depending on the timing of the gate cutoff, the output will be disturbed.

 

For example, in low-speed rotations

■Low-speed rotations like wind turbines

→The system may fail to detect rotation, resulting in a zero output despite actual movement.

 

■Shield machine

- Machine length: approx. 9 m
- Gross weight: approx. 600t
- Excavation speed: approx. 7.5 m/day (when digging)

→If the rotational speed cannot be measured, the two shielded machines will not match.

 

Periomatic™ measures frequency based on the period between pulses:

Rapid Response: Capable of responding to each cycle individually (in Mode A) or per gate cycle (in Mode B).
Error Minimization: Requires only two pulse inputs to determine the period, minimizing the impact of single-bit errors.
Elimination of Ripple Disturbances: This method inherently avoids ripple disturbances present in traditional frequency measurements.

 


Traditional Gate Method Periomatic™ Method
Response faster than the gate time is not possible.
 Enables response to each individual cycle.
Short gate times increase single-bit error impact, reducing accuracy. Determining the period with just two pulses minimizes error impact.
Analog outputs suffer from ripple disturbances. Eliminates ripple disturbances entirely.

 

 

As input frequency decreases, the period extends compared to the previous cycle,
　　▼
Leading to a reduced measurement output.
　　▼
Periomatic™ utilizes hyperbolic prediction computations to adjust the measurement output accordingly.

 

Frequency (f) and period (T) have an inverse relationship: f = 1/T.

　ｆ＝1/T

In Cartesian coordinates, this relationship forms a rectangular hyperbola.

 

 

Pulse input and F/V voltage output by the operation of the Periomatic™A method are shown below.

The pink area shows the difference with and without Dynamic Prediction™.
There is a big difference in the measurement results.
The *Periomatic™ B method also has a Dynamic Prediction™ function, which is updated every gate hour.

 

Measures the number of input pulses between pulse signals and output update time as an internal gate
　　▼
Measure the number of pulses and the period of pulses, then find the sum of the periods and average them.
　　▼
Dividing the total period by the number of pulses
　　▼

Enables measurement of the average period per pulse!

 


■Example 1: Gate time 1ms, input pulse 1.5kHz

■Example 2: Input frequency fluctuates

 


Periomatic™ is available in two types: Method A (response priority) and Method B (accuracy priority).

Periomatic™ A: Unique one-pulse response Periomatic™ B: Unique gating method
E.g. of operation


 E.g. of operation

■Wide range of measurement (from low to high speed)
■Highly resistant to ultra-low speeds
■High accuracy
■High-speed response (single-pulse response possible) ■Time averaging
■High accuracy can be obtained even in a short gate period.
■Acceleration: High-speed response with 1-pulse response, high accuracy even for rapid acceleration
■Deceleration: Accurate prediction calculation by Dynamic Prediction™ (hyperbolic prediction calculation)
■Stopping: Predicts stopping at appropriate timing according to usage conditions		 ■Precisely measures and averages the number of pulses and cycles within the gate time.
■No pulse count error within the gate time, which occurs in general gating methods, and high resistance to uneven pulses.
■Predictive calculation also works during deceleration, resulting in high accuracy and high speed response.

The Periomatic™ method makes it possible to measure rotational speed in detail, and COCORESEARCH proposed the term "rotational analysis.

＞ See F/V converter list   ＞ See speedmeter list　

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