Control, Application, Phenomenon | Hitachi AN070827-1 specification

1.Inverter model SJ300

2.Control

Vector Control (V2 mode)

3. Application

General applications where operation at low speed or zero speed operation is required.

4. Phenomenon

Actual rotation of the motor does not match the target speed, or the rotation becomes unstable in the low frequency range (roughly less than 1 Hz). Or the motor shaft creeps even with a 0 Hz speed reference.

5. Cause of the phenomenon

V2 (closed-loop vector) control is a speed control method based on calculating shaft speed from the pulse train input from the motor encoder. In the case of low speed, the number of input pulses decrease and it becomes difficult to count them within the pulse counting period. Therefore on SJ300 V2 mode, in the absence of encoder pulses, the process of motor speed estimation (speed observing) is done by using information like motor current, motor parameters, etc. This process is an estimation, and will have some errors. It sometimes results in instability as described above in item 4.

Encoder pulse

Speed detection when there are pulses from the encoder

Speed observer

Speed data for speed control

Motor current Motor constants

6.How to adjust

(1)Adjust motor parameters, inertia parameter (J) in particular, and try to obtain optimal motor performance.

(2)Disable the speed-observing function by the following method:

c Set debug mode ON ([C091] = “01” and STR) using the standard keypad (cannot be changed via ProDrive)

d Configure a value of “4000” into [C193] and STR (default is “0000”) This change disables the speed observer function.

e Set debug mode OFF ([C091] = “00” and STR

(3)This phenomenon occurs at low speed. Therefore using an encoder having a higher PPR (pulse per revolution) will improve performance at lower speeds.

Hitachi America, Ltd.

AN070827-1 specifications

The Hitachi AN070827-1 is a versatile and advanced integrated circuit designed for a range of applications in the electronics industry. This device, a part of the Hitachi product line, showcases a combination of effective performance, low power consumption, and a variety of features that cater to modern requirements.

One of the standout features of the AN070827-1 is its robust processing capability. It operates on a high-speed architecture, making it suitable for applications that require swift data handling and processing. This feature is particularly beneficial in environments where real-time performance is critical, such as in automation systems and consumer electronics.

The technologies embodied in the AN070827-1 include analog and digital signal processing capabilities. This dual capability allows it to manage complex signals, enabling users to harness the full potential of various sensor inputs. The chip is designed to support various peripherals and can be integrated seamlessly into existing systems, enhancing operational versatility.

The AN070827-1 also exhibits excellent power efficiency, making it an attractive option for battery-operated devices. Its design focuses on minimizing energy consumption, which extends the life of portable gadgets while ensuring that they deliver performance without compromise.

In terms of its operating characteristics, the AN070827-1 is capable of functioning in a wide range of environmental conditions. This durability makes it suitable for both consumer and industrial applications, ensuring reliability in diverse scenarios. Additionally, the chip supports a variety of communication protocols, which simplifies integration with other devices and systems, promoting interoperability.

Another notable attribute is its compact design, allowing for space-saving implementations, which is increasingly important in today's miniaturized electronics landscape. Manufacturers can incorporate the AN070827-1 into a variety of products, from smart home devices to industrial controllers, without concern for size constraints.

To summarize, the Hitachi AN070827-1 combines high-speed processing, advanced analog and digital signal handling, power efficiency, and robust operating characteristics into a single, compact package. Its adaptability to various climates and support for multiple communication protocols further enhance its appeal in a myriad of applications, making it a noteworthy component in the realm of integrated circuits.