Types of Elevator Encoders
One of the most important components in an elevator is the elevator encoder. In order to ensure that you use the best possible encoder in your system, it is a good idea to learn about the different types.
AFM60 absolute encoders
The AFM60 absolute encoders are designed to monitor the position and direction of a rotary or eccentric shaft. They are used in a variety of industrial applications. These encoders are compact and can be integrated with ease. In addition to mechanical contacting options, the product family also offers electrical versions.
These rotary encoders offer high-quality performance for a variety of applications. They provide accurate measurement of rotary speed and angle, and output all relevant information.
The high resolution of these encoders allows for interpolation. This can be done even with run-speeds greater than 15 m/s. High-resolution incremental encoders are capable of reading data (+- 10 mm) and can transmit it quickly.
One of the main advantages of these encoders is the ability to work in harsh conditions. For instance, they can be installed in a gondola. It can also be used in material transport vehicles.
Other benefits of these encoders include the ability to work in conjunction with a safety laser scanner. This is useful when monitoring the rotation of a crane winch. Another feature is their reliability.
Encoders are also used in the control of steering. They help to prevent excessive acceleration, depending on the cargo. Moreover, they can be programmed easily. Their PC-based programming tool makes it possible to adjust their parameters in order to suit special customer needs.
Besides providing high resolution, these encoders can be configured as needed. Some of these models have hollow shafts. Alternatively, they can be mounted directly. Using this type of mounting, they can be placed in places where a flange is not a preferred option.
The AFM60 encoder is available in both SSI and Sin/Cos combined interfaces. Combined with its PC-based programming tool, it can be used for various applications.
KCI 419 Dplus inductive encoders
KCI 419 Dplus inductive elevator encoders offer a wide range of benefits to users. These include enhanced availability, less cabling and installation, and increased brake monitoring. They are also resistant to vibration and magnetic fields. In addition, they offer an online self-diagnostic option.
The KCI 419 Dplus elevator encoder features an inductive scanning method that enables the device to determine the position of a safety brake. This means that the encoder will detect the brake stroke without the use of additional microswitches. Once the brake has been pressed, the encoder will transmit the axial distance, temperature, and brake state to the downstream electronics. Using this data, the electronics can determine the wear level of the brake, as well as the overall status of the brake.
KCI 419 Dplus inductive elevator rotary encoders are compatible with both small and large motors. They are designed to accommodate hollow shafts of various diameters. Specifically, the KCI 120 can be used with hollow shafts of 30 mm and wider.
Additionally, the KCI 120 Dplus encoder has a dual encoder that measures joint position and provides feedback for motor control. These two encoders work with a central scanning unit that is designed for different hollow shaft sizes.
In addition to its standard functionality, the KCI 120 Dplus can also provide a more accurate form factor than the previous generation. This is because the encoder tolerance sleeves are inserted into a circular opening in the motor housing. After the encoder is mounted, it is secured with a PressFit flange. A central screw then fastens the encoder to the motor shaft.
As with all elevator encoder Heidenhain products, the KCI 419 Dplus encoder is characterized by high quality, reliability, and precision. These factors are especially important for applications that require high accuracy.
EQN 400 incremental encoders
The ExN 13xx series of rotary encoders are designed to meet the unique needs of elevators. These encoders feature a robust design and a variety of interfaces. They also offer a wide range of mounting options, including hollow through-shaft versions.
While the EQN 400 doesn’t boast a groundbreaking feature, it does demonstrate the benefits of the latest in encoder technology. This encoder features an integrated coupling mechanism that reduces inaccuracy. Also, the shaft’s hollow construction allows for a direct connection to the rotor, which minimizes the need for additional rotor coupling.
Another feature is the high resolution of the position value. A test conducted in a laboratory setting showed reliable values at speeds of 6 m/s and 18 m/s.
In a similar fashion, the KCI 419 Dplus is a rotary encoder that measures how much axial travel a motor has. It also features a temperature monitoring function. With this unit, you can keep a close eye on your machine’s temperature without having to constantly run a probe down the shaft.
One of the best things about this rotary encoder is its compatibility with most subsequent electronics. Moreover, the unit has a long cable length of 10 meters.
The unit also boasts a number of other advantages. Its large, hollow shaft provides for an easy installation. Plus, it comes with an included bearing assembly that decouples the forces from the precision bearing.
If you’re looking for a good all-rounder, the EQN 400 is a solid choice. With its high resolution of the position value, you can be assured of a comfortable and smooth motion.
While you may have already heard of these, there are many more encoders available to choose from. You can even check out some of the more specialized offerings, like the LINA 200 linear encoder.
Slippage between the motor shaft and rotor steel laminations
When constructing an elevator encoder, slippage between the motor shaft and the rotor is not an unknown quantity. The question is, what is the best way to ensure that the shaft and rotor do not experience any overhanging forces that could potentially impede proper operation?
One solution is to use a heavy-duty, resilient mounting system. This type of mounting not only prevents vibrations from passing through, but it also reduces the transmission of noise and motor vibration. It also offers the added advantage of adjusting the height of the rotor to accommodate changing applications.
Another option is to use a pair of sprig bearings. These are double-sealed bearings that have seals on both sides. They are designed to handle the radial force imposed by the thrust of the load. In addition to reducing friction, they can also prevent the leaking of oil or other contaminants into the motor.
One of the easiest ways to determine whether or not the rotor and the motor shaft are moving relative to each other is to inspect the end bells of the rotor. End bells are also known as end shields. If a rotor is not shielded, it can be susceptible to abrasive material being thrown at it and causing damage.
A small positive voltage can be produced using a silicon controlled rectifier (SCR). Even though the signal is removed, current continues to flow through the gate. Depending on the application, this may be the best solution.
Another option is to assemble a pair of master controllers and slave controllers in series or parallel. While this will not allow for full-power control of the motor, it will ensure that each unit is running in its own set of speed ratios. Besides, the slave units will be able to respond to speed changes made by the master controller.
Proper alignment of the encoder
When it comes to the operation of elevators, the proper alignment of encoders is essential. Incorrect encoder positioning can cause a number of problems. Some of these problems are:
Improper alignment can cause the motor to run backwards or the motor to lose control. It can also cause the elevator car to move unintendedly. There are ways to fix these problems.
The first step is to check the encoder’s cable. The cable should be rigid and should elevator encoder be checked for cracks or damage. You should also check the resistance.
A good encoder should be accurate to half a count on the least significant bit. You should also check the encoder’s pulleys and belt. If these are worn or damaged, you may need to replace the encoder.
Encoders can be found in many different designs. They are designed to provide feedback to a controller regarding the motion of an elevator car. These signals can also be used to measure the speed and acceleration of the elevator car. This can help to ensure that the brakes on the elevator are activated.
Another way to monitor the motion of the elevator is by measuring the rate and order of light detector signals. If the encoder isn’t aligned properly, the light detector signals will not match the direction of the elevator.
The encoder should also be inspected for wear or damage. Any loose connections or electrical noise can cause a problem. For example, an encoder cable might be loose or the encoder might not be seated correctly on the motor shaft.
The optimum type of encoder for an elevator is one that can withstand vibrations. Magnetic encoders are a great option for this.
