technical data linear actuator Power Cylinder Selection

Selection: U Series

Requirements

Machines and methods used

Thrust or load N{kgf}

Stroke mm

Speed mm/s

Frequency of use Number of starts/min

Usage time (hours/day) and annual operating days (days/year)

The nature of the load on the machine used

Usage environment

Power supply voltage, frequency

Selection Procedure

Deciding the model STEP1

Please choose the type (B or C) based on the operating environment standards and usage method.

Deciding the model number STEP 2

  • (1) Calculate the annual travel distance based on the stroke, frequency of use, and duration of use.

    Annual travel distance km = Actual stroke m × frequency of use times/day × number of operating days/year × 10-3

  • (2) Refer to Table 1 to determine Service factor based on the load characteristics and the machine being used.
  • (3) Multiply the thrust or load by Service factor to obtain the corrected thrust.
  • (4) Based on the corrected thrust and annual travel distance, determine the frame number from the graph below "Expected travel distance", then select the applicable model number from the list of standard models (here) based on the stroke, speed, power supply voltage and frequency.

Table 1 Service factor

Load Nature Examples of machines used Service factor
Smooth operation without shocks
small inertia		 Damper and valve opening and closing
Conveyor switching device		 1.0～1.3
Operation with light shock
During inertia		 Opening and closing hopper gates, various transfer devices, lifting and lowering of various lifters 1.3～1.5
Operation with large shocks and vibrations
Large inertia		 Heavy-duty transport by cart, buffer for belt conveyor, reversing opening and closing device for large lid 1.5～3.0

Note: The above Service factor are general guidelines and should be determined taking into consideration the conditions of use.

Checking the characteristics STEP 3

  • (1) Use the product at or below the allowable frequency (Table 2).
  • (2) Check Percentage duty cycle.
  • (3) Check the coasting distance and stopping accuracy in Table 3 below.

Table 2 Permissible frequency of use

Series name and type LPUB・LPUC
Motor capacity (kW) 0.75 1.5 2.2 3.7 5.5 7.5 11 15
Thrust/speed 6000S 6000L 6000M 6000H
8000S 8000L 8000M 8000H
12000L 12000M 12000H
16000L 16000M 16000H
22000L 22000M 22000H
32000L 32000M 32000H
50000L 50000M 50000H
Number of starts (times/min) 4 4 4 4 3 3 2 2
Percentage duty cycle (%ED) 25%ED

Note: This usage frequency is determined by the heat generated by the motor. It does not take into account the lifespan of the cylinder body.

The allowable operating frequency of Power Cylinder U Series is within the range that satisfies the number of starts and Percentage duty cycle shown in the table above. Percentage duty cycle is expressed by the following formula.

Percentage duty cycle (%ED) = Operation time per cycle Operation time per cycle + Down time x 100%

Table 3 Coasting distance and stopping accuracy (reference values)

Unit: mm
How to use Brake internal connection Brake external connection *
Push-up load Suspended load Push-up load Suspended load
Model number coasting distance Stopping Accuracy coasting distance Stopping Accuracy coasting distance Stopping Accuracy coasting distance Stopping Accuracy
LPUB6000
LPUC6000 		S 0.6 ±0.2 0.8 ±0.2 0.5 ±0.1 0.6 ±0.1
L 2.7 ±0.6 4.4 ±1.2 1.8 ±0.4 3.4 ±0.9
M 4.5 ±1.0 7.4 ±2.0 2.7 ±0.5 5.5 ±1.5
H 7.6 ±1.7 12.2 ±3.2 4.6 ±0.9 9.0 ±2.4
LPUB8000
LPUC8000 		S 1.9 ±0.4 2.9 ±0.7 1.3 ±0.2 2.2 ±0.5
L 3.6 ±0.8 5.8 ±1.6 2.2 ±0.4 4.3 ±1.1
M 5.6 ±1.2 8.4 ±2.1 3.4 ±0.7 6.1 ±1.5
H － － － － 5.4 ±1.0 8.7 ±2.0
LPUB12000
LPUC12000 		L 2.1 ±0.5 3.0 ±0.8 1.3 ±0.2 2.2 ±0.5
M 3.5 ±0.8 5.1 ±1.3 2.1 ±0.4 3.6 ±0.9
H － － － － 3.6 ±0.7 5.9 ±1.4
LPUB16000
LPUC16000 		L 2.8 ±0.6 4.0 ±1.0 1.7 ±0.3 2.8 ±0.7
M － － － － 2.6 ±0.5 4.0 ±0.9
H － － － － 3.9 ±0.7 8.6 ±2.4
LPUB22000
LPUC22000 		L － － － － 1.3 ±0.3 2.0 ±0.4
M － － － － 2.0 ±0.4 4.2 ±1.0
H － － － － 2.7 ±0.5 4.4 ±1.1
LPUB32000
LPUC32000 		L － － － － 1.3 ±0.3 2.0 ±0.4
M － － － － 2.0 ±0.4 4.2 ±1.0
H － － － － 2.7 ±0.5 4.4 ±1.1
LPUB50000
LPUC50000 		L － － － － 1.3 ±0.3 2.0 ±0.4
M － － － － 2.0 ±0.4 4.2 ±1.0
H － － － － 2.7 ±0.5 4.4 ±1.1

*Please refer here for wiring for Brake external connection.

Load Type

Push-up load

Push-up load

Suspended load

Suspended load

vertical use

Note: In actual operation, it is necessary to prevent the rod from rotating.

Coasting distance: The distance until the limit switch or stop button is activated and the machine stops. This coasting distance varies depending on the load and the number of times the switch or stop button is operated.

Stopping accuracy: The amount of variation in the stopping position when stopping is repeated.

Estimated life span

The product life of Power Cylinder U Series should be determined by travel distance of the cylinder (nut).

Cylinder (nut) travel distance

The life of Ball screw is determined by flaking caused by fatigue on the rolling surface. Please check the approximate lifespan using this expected travel distance graph.
However, if there is a lot of impact or if proper lubrication and maintenance are not performed, the expected travel distance will be significantly reduced.

Expected travel distance (km) = Actual load stroke (m) × frequency of use (times/day) × number of operating days/year × 10-3 × expected number of years

The graph on the right is based on the L10 lifespan. L10 lifespan is the lifespan that 90% or more of the total can achieve, expressed in terms of travel distance. When selecting Power Cylinder based on lifespan, please select the model number from the graph on the right.

If the load fluctuates significantly midway through the stroke, calculate the equivalent load (P M) using the formula below.

PM = PMIN + 2×PMAX 3

P M: Equivalent load N{kgf}

P MIN: Minimum load N{kgf}

P MAX: Maximum load N{kgf}

If you are looking for even greater travel distance, please consider the N specification (here).

Expected travel distance

Expected travel distance

Selection example

Usage: Hopper gate opening and closing (2 intermediate stops, forward and backward limit pressing stops)

Required thrust: 41.2kN{4200kgf}

Stroke: 1000mm

Speed: 1000mm in about 45 seconds

Frequency of use: 1 round trip per 60 minutes (1 round trip/hour)

Usage time: 8 hours/day, 250 days of operation/year. Service life: approx. 5 years.

Load characteristics: Light impact operation, forward and reverse load

Usage environment: Outdoor installation, dusty, temperature 0-35℃

Power supply: 220V 60Hz

Determining the Type

With push stop and internal stop → Select C type

Deciding the model number

  • 1. Service factor: 1.3
  • 2. Corrected thrust: 41.2kN{4200kgf}×1.3 = 53.6kN{5460kgf}
  • 3.Model number: LPUC 6000 L10 K2 J

    K2...Stop at 2 intermediate points

    J......With bellows (high dust content)

Characteristics check

  • 1. Number of startups
    • Start times: 2 times/60min < 4 times/min
    • Percentage duty cycle:
      1000mm 22mm/sec* ×2 times (1 round trip) 60 minutes × 60 seconds × 100 = 2.5% < 25%

      *Speed calculation 1000mm / 45 seconds = 22mm / second

  • 2. Total number of push (pull) stops: 2 times/reciprocation, service life 5 years (250 days/year)
    • 2×1×8×250×5 = 2×10 4 times < 10×10 4 times

Checking the lifespan

  • 1. Annual travel distance: 1.0 x 2 x 1 time/hour x 8 hours/day x 250 days/year x 10-3 = 4 km
  • 2. Expected mileage life: 4km x 5 years = 20km
  • 3. Equivalent load: P M = 53.6 + 2×53.6 3 = 53.6kN{5460kgf}

*The above load - expected travel distance satisfies the expected mileage life of LPUC6000.

Selection considerations: U series

Brake holding power

The load holding force of Power Cylinder U series when stopped is greater than the rated thrust, so it can be used to hold the rated load. This holding force is generated by the braking action of the brake-equipped motor. The brake is a spring-operated type that always applies braking force with spring force when stopped, and the brake torque has a holding force of 150% or more of the motor's rated torque.

*When selecting Power Cylinder, please select Power Cylinder with sufficient thrust, taking into account a safety factor, so that the working load (static and dynamic) does not exceed the rated thrust.

Brake stop

This method activates and stops the brake by operating a limit switch or a stop button, allowing for multi-stage positioning such as upper and lower stroke limits and intermediate stops. The coasting amount and stopping accuracy vary depending on the operating speed and load.

When precise positioning is required or when the operating speed is high, we recommend Brake external connection. When setting the limit switch, give a stop signal taking into account the coasting distance.

Reference values are shown in Table 3 above.

C-type press stop allowable number of times

When pushing (pulling) and stopping frequently

If you use it more than 10 times a day, please refer to the standard total number of stops by model in the table below.

type LPUC6000～LPUC32000
speed S,L M H
Reference total number of stops (×10 4 times) 10 3 ※
  • Note)
    1. If you are using the product for a push (pull) stop, we recommend that you use a separate wiring for the brake section.
  • 2. If you are using the product beyond the limits in the table above, we recommend stopping the stroke by using the stroke adjustment LS.
  • 3. When using with a push (pull) stop, the strength of the mating device should be 250% or more of the rated thrust.
  • 4. When the cylinder stops, use the inverter to decelerate it.
    *The life span is affected by the amount of deflection of the disc spring, so the more you decelerate, the more you can increase the standard total number of stops.
    For example, if you use H speed, the total number of standard stops will be up to 100,000 if you stop at the same speed as S speed. Please contact us for more information.
  • 5. The UC50000 cannot be used for regular push (pull) stop.

Allowable weight when driving horizontally

The safety device does not work at start-up when opening and closing the damper or hopper gate, or when performing normal reversing, tilting, or lifting, but if the inertia is large, such as when the cart moves horizontally, the safety device will work at start-up and operation may not be smooth. Please refer to Table 4 for the allowable mass m for each model.

Allowable weight when driving horizontally
  • Cart mass: m kg
  • Friction coefficient: μ
  • Bogie running resistance: = μ m ≦ Rated thrust

Table 4 Allowable mass m

Unit: kg
Power Cylinder model number LPUB6000
LPUC6000		 LPUB8000
LPUC8000		 LPUB12000
LPUC12000		 LPUB16000
LPUC16000		 LPUB22000
LPUC22000		 LPUB32000
LPUC32000		 LPUB50000
LPUC50000
speed L 42000 51000 170000 204000 305000 680000 960000
M 35000 40000 123000 160000 230000 490000 1080000
H 25000 32000 74000 100000 307000 670000 720000

Note: This is not a problem at low speeds (S).

Linked operation method

Power Cylinder can be used for transporting and lifting work by sharing the load among several Power Cylinder as shown in Figure 1. This is because there is little change in speed due to load fluctuations.

Please pay attention to the items on the right when selecting.

Figure 1: Interlocking operation of several Power Cylinder

Linked operation method

Control Method

To start, turn on the power for all units at the same time, and to stop them, use the limit switch on each Power Cylinder. Avoid controlling all units with one limit switch, as this will cause cumulative stroke errors.

Linkage Accuracy

The speed fluctuation of each Power Cylinder during operation is caused by load fluctuations and is generally about 5%. For variations when stopping, refer to the stopping accuracy in Table 3 above. If you wish to synchronize, please use the multi-specification.

​ Required thrust per unit N{kgf} Number of Power Cylinder used x Multiple factor

Table 5. Multiple factor

Number of Power Cylinder used 2 units 3 units 4 units 5 units 6 units
Multiple factor 0.8 0.7 0.6 0.55 0.5
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