As energy saving has become the focus of global attention, the energy efficiency of motor design has increasingly become a concern. Motor drive products continue to meet the development trend of the industry, helping designers improve energy efficiency, reduce energy consumption, improve reliability, reduce the number of components, etc., and play an active role in achieving energy saving.
Motor market development trend
After 100 years of development, the application field of the motor has been very extensive. The application of ON Semiconductor's motor drive products in the automotive and industrial fields is a microcosm of the main trends in the motor market.
The first is the trend of automotive electrification, that is, automobile manufacturers use integrated energy-efficient motors to replace the power of traditional internal combustion engines, usually using brushless DC (BLDC) motors instead of belt and gear drives for auxiliary components under the hood, such as pumps, Valves, heating and air conditioning, fans, etc. Because BLDC motors have quite excellent performance, they have also begun to enter other applications that traditionally use brushed DC (BDC) motor solutions.
Another trend is that the increase in the application assembly rate increases the number of motor installations, such as motorized heating, ventilation and air conditioning (HVAC) air flap control (mainly used for brushed DC and unipolar stepper motors) has also begun to be applied to lower-end cars HVAC system.
The application of BLDC motors in industry and telecommunications is also becoming more and more common. Typical applications include fans, blowers, pumps and compressors. BLDC motors are more energy efficient than AC motors or switched reluctance motors. BLDC motors enable low-cost variable-speed applications, especially for integrating sensorless commutation algorithms, which can eliminate external sensors.
New requirements for energy-saving trends in motor drive applications
Energy cost is usually the most important part of the cost of the entire life cycle of the motor. Therefore, the use of more efficient motors can save a lot of energy.
The new requirements of energy saving trends on motor drive include several aspects. First, the energy efficiency is determined by the selected motor technology and motor structure. Therefore, it is required to choose a motor that can convert the electrical energy into mechanical energy to the highest proportion. Second, choose a drive circuit that minimizes the power consumption of the driver and improves energy efficiency. Third, it is necessary to improve the motor drive intelligence to achieve an optimized energy consumption plan.
In addition, some applications require that brushless motors (using stepper or brushless DC motors) are not used in the system; sensorless commutation (without potentiometer or Hall sensor feedback) is used, and motion control algorithms (for Power applications), bring energy efficiency to the highest, reduce audible noise, improve electromagnetic interference (EMC) performance, etc. In addition, there are some applications that require the drive circuit and the motor to be placed next to the electromechanical actuator and connected to the central control unit via a bus (LIN, I2C, etc.).
ON Semiconductor's innovative solutions to improve energy efficiency in motor design
In fast, precise and dynamic motion control applications, stepper motors are an increasingly popular choice. With the development of motor technology, standard products for intelligent drives / controllers (ASSP) have emerged to drive these motors efficiently. These devices provide designers with more flexible solutions, open up space for innovative functions, and discover many new applications.
1. Bipolar stepper motor drive and controller
The AMIS-3062x series of AMIS-30623 developed by ON Semiconductor is a drive and controller for efficiently driving bipolar stepper motors in electromechanical actuators. This product embeds a dedicated finite state machine and a local interconnect network (LIN) instruction set customized for advanced headlamp system (AFS) system requirements. The device integrates non-sensing control and detection functions, which can improve reliability, reduce the number of components and board space, and reduce product cost. AMIS-30623 is specially designed for remote and multi-axis positioning applications. Designers of non-sensor control detection functions can easily complete accurate positioning calibration and semi-closed loop operation.
The LIN interface of AMIS-30623 makes it suitable for mechatronic solutions that need to be connected to a remote LIN host. Target applications for this product include headlamp level measurement, automatic HVAC design, surveillance camera control, professional lighting equipment, and industrial robots. The operating temperature of AMIS-30623 is -40 ℃ to 125 ℃, can transmit up to 800 mA of programmable current. The positioning controller on the chip can modify the configuration according to the monitoring type, positioning range and parameters. This product also has current retention characteristics. Figure 1 is a block diagram of AMIS-30623.
ON Semiconductor's AMIS-30624 stepper motor driver can also be used for removable panoramic shooting-swing up and down-zooming (PTZ) security camera applications. The device drives three motors with a simple microcontroller through the I2C bus. This topology supports an extremely compact camera design, which helps reduce costs and provide precise work.
The core of the AMIS-3062x single-chip solution is a digital motion controller and an H-bridge layout 50mA to 800mA bipolar two-phase stepper motor driver. This driver provides micro-stepping operation, so there is no longer a trade-off between speed, noise, and step loss due to resonance. The motion controller provides programmable peak current and uses a 20kHz PWM current control scheme. It also integrates the system communication interface, with LIN or I2C interface to choose from. In remote or distributed applications including the automotive industry, the LIN architecture can reduce wiring and improve EMC performance. Devices equipped with I2C are more suitable for use as a peripheral device with a local microprocessor on a separate PCB.
The main advantage of this series of devices is that all application-specific motion control functions can be pre-programmed in the factory, which significantly reduces the coding work of engineers. If the flash memory version of the device is selected, it can also be reprogrammed when developing applications and testing and debugging software later. This will significantly accelerate the speed of design updates.
·Basic precautions
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·Cleaning notes
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