Sponsored by KEB
Historically, a combustion engine supplies extra than simply traction energy to the wheels for business autos. It powers smaller auxiliary masses from the drive belt comparable to the facility steering pump, air compressor for brakes and suspension, HVAC compressor, and coolant pump. And for physique gear, an engine supplies energy by way of PTO to bigger masses comparable to hydraulic pumps. However electrical autos with a propulsion motor that aren’t always operating means the auxiliaries have to be independently managed.
Whether or not it’s a supply van, bus, heavy-duty truck, or cellular equipment, all of those car varieties will probably have a number of auxiliaries. Moreover, autos may have variable configurations of apparatus. KEB presents a versatile system strategy to affect a number of auxiliaries with the T6 Auxiliary Inverter. This paper examines every product function and showcases the worth it has for designers and system integrators.
Scalable and Modular {Hardware}
To assist a number of auxiliaries, the T6 Auxiliary Inverter is designed to be a scalable and modular “system” answer. The system consists of a number of inverter output levels contained inside a single housing. Which means that one excessive voltage DC enter provide to the system, one set of coolant plumbing connections, and one set of low voltage management connections. From a scalability standpoint, the T6 system will be scaled from a single inverter output to a most of six impartial AC motor management outputs. And from a modularity standpoint, every inverter module has an influence score choice of seven.5kW (16.5A), 15kW (33A) or 30kW (60A). Thus, there are 83 doable {hardware} system configurations.
For multi-axis programs, there are a number of advantages to think about:
Diminished elements – In contrast with individually distributed inverters models for every auxiliary, a multi-axis system answer reduces redundant elements comparable to DC cables, DC fuses, coolant plumbing, and low voltage wiring harnesses. A discount within the variety of elements results in a cleaner format, a smaller footprint, much less weight, fewer potential factors of failure, decrease upkeep, and a simplified set up course of.
Diminished value – Along with lowering the whole programs value by eliminating redundant elements, a multi-axis unit itself turns into more and more cost-efficient because the variety of output modules will increase. That’s, the marginal value so as to add extra energy modules to a system goes down. Thus, a multi-axis inverter turns into a very engaging funding when controlling greater than two auxiliaries.
Versatile set up – The T6 Auxiliary Inverter does NOT must be put in close to the auxiliary motor. This flexibility is vital the place area is proscribed. Motor cable lengths as much as 30 meters have been examined and permitted, permitting the inverter to be distant mounted from the auxiliary motor. That is doable since electromagnetic compatibility (EMC) was given consideration within the design phases, comparable to built-in DC choke filters to mitigate electromagnetic interference, connector shielding and clamping, and shifted IGBT switching. Moreover, the T6 housing is IP67-rated for environmental circumstances and due to this fact appropriate for exterior mounting, such because the chassis body or elsewhere on the car.
Versatile Motor Management Options
Since auxiliary motors come in numerous varieties, the T6 Auxiliary Inverter supplies versatile choices to manage all sorts of AC motors with strong management and straightforward start-up. The supported motor varieties embody induction motors, everlasting magnet synchronous or servo motors, and synchronous reluctance motors which will be operated in pace, torque, or positioning management modes. All of those motor varieties and management modes can function with sensorless motor management.
Sensorless management eliminates the necessity for a motor encoder (or resolver) by using a mannequin of the motor traits with present and voltage as suggestions to supply closed-loop efficiency and has a number of advantages.
Diminished value, elevated reliability – Eliminating the motor encoder and cable reduces system prices and eliminates a possible level of failure. It will increase system reliability towards elements to which an encoder could also be vulnerable, comparable to electrical noise, vibration, or temperature
Elevated effectivity – Sensorless management is field-oriented or vector management which optimizes output voltage, due to this fact rising energy effectivity primarily based on the precise working load circumstances.
Elevated efficiency – KEB’s sensorless management algorithms are best-in-class, offering a extremely dynamic pace management response and correct torque management. This leads to quick turn-on instances for power-on-demand gear recovering from energy-saving standby operation. It will increase efficiency and productiveness with tight regulation in response to load steps and quicker working cycle instances. It additionally will increase fault safety by mitigating present overshoot and has programmable present limits.
Lastly, characterizing a motor for sensorless operation is straightforward with the T6 Auxiliary Inverter. The characterization algorithms are strong and appropriate with practically all AC motors, whatever the producer (this can be a often requested query from first-time customers who’ve struggled with this on different merchandise). KEB’s free Combivis program has easy-to-use setup wizards that stroll the consumer by means of the essential motor nameplate information (e.g. present, voltage, pace, frequency, energy) entry. The characterization itself is an automatic study course of that solely takes a couple of minutes. When the traits have been acquired, the settings will be saved to shortly fee subsequent motors.
System Administration and CAN Communications
For system management and diagnostics with the car ECU, the T6 Auxiliary Inverter makes use of an embedded controller which acts as a CAN J1939 communications hub and gateway.
Every auxiliary motor management stage can have configurable transmit and obtain course of information telegrams and SPN mappings in addition to configurable PGN addresses. The good thing about this association is that there’s one 2-wire CAN connection and one Controller ID for controlling and managing a number of auxiliary nodes. This allows the consumer to find out what information they wish to be communicated over the CAN bus for every inverter node and the way to prepare the task and addressing. Alternatively, there’s the choice to make the most of pre-installed embedded management packages with pre-configured communication and inverter settings (e.g. Torque/Velocity Management) for fast setup of any node(s).
Startup Instruments and Assist
KEB is understood for its dependable merchandise and buyer assist.
KEB’s free Combivis program is a robust software to help in startup and adjustment with easy-to-use wizards, helpful diagnostics and troubleshooting options comparable to a digital oscilloscope, and TeamViewer is built-in for distant assist. This system can save mission information and parameter lists for fast setup of subsequent programs (these information may also be used to pre-configure the T6 system from the manufacturing facility).
One other key function is the automated motor study wizard. It’s used to characterize motors for sensorless operation. Solely primary motor nameplate information is usually wanted, and the automated course of takes 3 – 5 minutes.
Along with software program instruments, KEB has devoted eMobility groups for native assist. These groups are regionally primarily based in North America and Europe. KEB helps at each stage of the mission – design idea, system sizing and choice, startup and commissioning (together with onsite assist, as permitted), collection manufacturing preparation, and technical and after-sales troubleshooting and assist.
If there are auxiliary electrification functions you’d like to debate, please attain out to us at gross [email protected].
Sponsored by KEB
