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Buying Guide for Electric Swing Gates - Linear Rams



The following information will explain all you need to know to determine which 'Linear Ram' electric gate motors

are best for you. Before selecting an appropriate motor you will need some basic information about your gate

set up and environment. The information can then be used to cross reference with the motor specifications and

manufacturer guidelines.


There are 6 steps to choosing the right electric gate motor/s for your installation.. 


Step 1 -What power output is right for your electric gates?


Gate Motor Power Output


Electric gate motors have 2 types of power outputs 230v or 24v. Both types can be wired directly from your mains power.

The number of gate operations per hour will determine which type of power output is required.

Motors are designed to operate within a certain capacity (operations per hour).

Choosing a motor compatible with your expected usage is essential for its durability and safe operation.

For residential usage, a gate opening infrequently (5-15 times an hour) a 230v electric motor is more than capable.

If the electric gate is intended to be in use more frequntly (+15 times per hour) then a 24v system is recommended.

24v systems run cooler than 230v electric gate motors which allows for more intensive use.

24v electric gate motors tend to be used on commercial/communal premises, where as 230v on standard residential properties.


Step 2 - What are your gate dimensions?


Gate Motor Weight Width


All electric gate motors are designed to operate gates within weight and width parameters. 

Each manufacturer will have a range of electric gate motors which operate up to a maximum

weight. The weight limit ensures the motor will operate the gate/s in a reliable and safe

manner by providing the right amount of torque. Under-powered motors will not hit their

opening/closing points and over-powered motors may cause damage to the gate and/or hinges.

If you are unsure of your gate leaf weight, use our estimator as a guide


As with weight, electric motors are designed to operate gates of certain widths. The motor 

mechansim will vary in size to suit the width of the gate. Its important to note the motor 'max' width

can be greater than your gate (to a certain extent as per manufacturer guidelines) but not lower. If the

'max' width of the motor is lower than the measurement of your gate, it will not gain the required

leverage to reach its fully open or closed positions.


Note down your weight and width measurements to cross reference against the manufacturers specifications.


Step 3 - Understanding the Geometry Requirements for the Motor





The most common form of on-gate electric motors are linear rams,

they cover almost all gate formats. Linear Rams operate the gates through 

a curved trajectory. This forms the geometry of the the linear ram

through its opening and closing cycle.






For linear rams the geometry is defined by 2 dimensions: the 'A & B' measurements. 

These measurements are determined by the 'stroke length' of the motor. 

The 'stroke length' is the operating length of the motor arm.


The A/B measurements are calculated as follows:

Overall stroke length (minus 15-20mm depending on the manufacturer -

the motors cannot use their total operating length so a provision is given) divided by 2.

This then gives you the A/B measurements which form the pivot point to mount the

motor for optimum mechanical leverage.



A B Measurements with Bracket 













See the kit myAster 3TI as an example:


The stroke length of the myAster 3TI is 315mm.

Full expansion 980mm minus complete retraction 665mm = 315mm stroke length.

Provision for the motor is 15mm, leaving 300mm.

300mm divided by 2 = 150mm

A = 150mm

B = 150mm


To gain the optimum geometry the motor's pivot point should be positioned 150mm x 150mm from the centre of the gate hinge.



Each manufacturer calculates the optimum A & B measurements. These measurements are detailed in their corresponding instruction manuals.

The measurements are shown in a table along with other variants of A & B all within a tolerance. Installing the motor outside of these tolerences

will put the motor at risk and also void the warranty.

Generally speaking if A is reduced, B will be increased by the same amount and vice versa to stay within the motors permitted geometry.

This table shows the myAster 3TI A/B install parameters from the instruction manual:

A &  B Table



The D dimension explained..

As well as the A & B measurements, there is one other dimension to consider - The D.

The D dimension only comes into play for side hung gates.


A B Measurements with Bracket


The D measurements are detailed alongside the A & B dimensions within the install parmater tables.

The D measurement is the distance from the centre of the hinge to the ouside edge of the pillar (as detailed in the diagram above).

It is always shown as a 'maximum'. If the hinge position measures greater than specified, installing the motor is not possible.

For the simple reason - the motor itself will come into contact with the corner of the pillar and prevent the gate from opening or closing.

This generally occurs with over-sized pillars. If this is the case then an articulated arm would be a more suitable option.


Step 4 - Installing the Linear Ram Electric Gate Motor


The motor will attach to its bracket via a pin so it can turn during its opening and closing phase.

Mounting Pin

Mounting Pin2


The bracket must be mounted so the pivot point of the motor (the pin) coincides with the A & B measurements (And D if side hung).

Generally the bracket is either bolted or welded to the pillar or post.

You will need the following measurements to determine whether the motor bracket can be directly mounted to the post.

Pillar Width

Hinge Distance from Pillar

These measurements should be noted as they are needed to cross reference against each models specifications and manufacturer guidelines.

If your pillar width is too small to mount the motor bracket directly (which is very common when retro fitting gate motors) then an additional post may be needed or an adapted bracket.


Step 5 - Can you Install Gate Stops






Most electric gate motors require a physical stop at the end of the opening and closing cycle.

Gate Stops provide resistance to the motors so they know they've reached either the open or

closed position. Without Gate stops the motors will over extend during their operation and the

mechanism will eventually fail. When assessing your gate-way it is important to check you can

install physical stops in both the closing and opening positions.

A Common reason why gate stops cannot be installed is because of a sloping driveway or the

gate is raised significanlty off the ground.

If you cannot install something to provide resistance at either end of the motors cycle then you

will require a specialised ram with in-built mechanical stops.


Step 6 - Choosing a Motor


Armed with information about your gate set-up and the linear ram install requirements you can now filter down to a solution which is right for you.

This information will provide the basis to indentify which electric gate motor best suits your requirements.

To demonstrate how to use this information we will use the following as examples:


Example 1 - Double Swing Gate Format - Our example gate is a residential light weight wooden gate with low usage.


Select a kit which most suits your gate...


Gate Automation: Swing Gate

Power Output/Motor Voltage: 230v

Gate Weight: 150kg

Gate Width: 1.8m

Pillar Width: 250mm

Max Angle: 90 Degrees

Daily Usage: Up to 15 operations a day

Hinge Position: Back Hung

Hinge Distance from Pillar: 50mm




Then select the right model - myAster 3TI 230v is most suitable due to the length and weight of the gate...



Then check install requirements - these can be found in the Instruction manuals under the download section of the product page:



Install parameters for the Aster 3TI from the instruction manual...




The motor in this kit will mount directly to the pillar using the most optimum A & B dimensions with no adaptation needed.


Double Swing Gate Kits

Single Swing Gate Kits






Gate Automation

Please select what type of automation you require for your gate/s. Double & Single Swing refer to motors which attach to the gate and pillar of a swing motion gate. Double & Single Underground refer to motors which lay beneath the ground which attach to the hinge end of swing motion gates. Choose Sliding if you require lateral moving gate automation and Wheeled if you require a motor which utilises a wheeled motor to drive your gate/s.

Motor Voltage

There are two types of power outputs to consider - 24v & 230v. If you need a higher number of operations (opened/closed more than 5-6 times in an hour) during peak periods such as the morning and evening, then you may wish to consider a 24v system.

24v systems are more suitable for higher operation levels as they tend to run cooler than 230v gate motors. However, they do cost more in relative terms, so if you only need to open or close the gate 1-5 times an hour then a 230v system might prove more cost-efficient.

24v motors tend to be used on commercial premises, whereas 230v tend to be used on standard domestic properties. The exception to this rule is sliding gate motors where the reverse is true - 24v sliding gate automation systems tend to be for domestic use, 230v for more intense use (commercial/communal).

24v systems can draw power from battery backup systems meaning they can still operate during any mains power cut (a 230v or 3 phase system would need to be opened with a manual release key).

24v systems can also utilise solar power units as a means of charging batteries, allowing you to site gate automation in rural and remote locations where mains power is unavailable.

Specifications can be found for each product from their datasheet. Each datasheet is downloadable from each product page on this website.

Weight of Gate

All electric gate motors operate up to a maximum weight. This is so the gate will operate in a reliable and safe manner. It is essential to know the weight of each gate leaf in order to choose the correct motor for you installation. If you do not know the weight of your gate/s, send us a photo along with the gate/s dimensions and we can advise.

Gate Width

As with weight, gate motors are designed for gates within certain dimensions. The most important dimension is the width of the gate. To ensure you select the right motor to operate your gate you must know the width of each gate that requires automation.

Opening Angle

Each motor has a maximum angle to which it can operate to. Therefore it is important to note how far the gate needs to open in order for a vehicle to enter/exit safely.

Daily Use

The amount of times your gate is used per day is a determining factor when deciding on the right motor for your usage. Motors are designed to operate within a certain capacity (operations per day) so choosing a motor compatible with your desired use is essential for its durability. Select from the options below the number of times (open & closure = 1 x operation) the gate/s will be operated on an average day.