“An electric motor is a device that converts electrical energy into mechanical energy and can be used to drive articulated mechanical devices linked with it. The electric motor must be able to generate a lot of torque from zero speed and maintain high efficiency over the entire load range. It also needs to have a simple drive and control system.
An electric motor is a device that converts electrical energy into mechanical energy and can be used to drive articulated mechanical devices linked with it. The electric motor must be able to generate a lot of torque from zero speed and maintain high efficiency over the entire load range. It also needs to have a simple drive and control system.
DC motors use electrical energy in a continuous manner. They are usually less powerful and are particularly suitable for applications that require low drive torque and a certain degree of operational flexibility. AC motors are driven by single-phase or three-phase AC and are divided into synchronous motors and asynchronous motors. Among them, the speed of the synchronous motor is closely related to the frequency of the sinusoidal current.
Before choosing the ideal motor, the engineer needs to first understand the weight and volume of the load and the required operating speed. Therefore, the working area of the motor under a certain load must be lower than the torque curve of the motor. The standard method for determining the size of a motor is to assume a “limiting” state (in other words, to determine the torque and speed peaks required by the application) to ensure a reasonable working margin.
From ventilation to the transportation of liquid and solid materials, reliable AC motors are essential for many industrial production processes. AC motor drive designers have been working hard to save energy and reduce size. For example, Power Integrations’ gate driver solution integrates compact, standard and high-quality AC motor drivers well.
The company’s SID11x2K series is represented by single-channel IGBT and MOSFET drivers in a standard eSOP package. This series uses solid insulator FluxLink technology to provide reinforced electrical isolation. Its 8 A peak output current can drive devices up to 600 A (typical) without any other active components.
Figure 1: SID11x2K typical application schematic diagram
The SID1183K series are also single-channel IGBT and MOSFET drivers in the standard eSOP package, but have some additional functions, such as short circuit protection (DESAT) with advanced soft shutdown (ASSD) function, and under-voltage protection for primary and secondary sides. Voltage lock protection (UVLO), and rail-to-rail output function with temperature and process compensation output impedance, can ensure that the equipment can operate safely under harsh conditions.
Figure 2: SID1183K typical application schematic diagram
The SID1183K series has a low propagation delay time of 260 ns, a propagation delay jitter of ±5 ns, and high common-mode transient immunity. Its FluxLink technology enables safe isolation between the primary side and the secondary side.
Compared with brushed motors, brushless DC motors (BLDC) have higher efficiency and reliability, and their applications are increasingly involved in household appliances and consumer electronics. With the continuous improvement of energy efficiency standards for these applications, power conversion technology also needs continuous improvement to minimize total power consumption and simplify design.
The driver is the basic component of BLDC control. It is a power amplifier that can generate output voltage to drive the high-current, high-side and low-side IGBT gates of the H-bridge circuit. Power Integrations’ BridgeSwitch series products can be used for BLDC engines with power up to 400 W. The efficiency of the high-voltage half-bridge motor reaches 99.2%, no radiator is required, and the time and cost of software certification are reduced.
BridgeSwitch driver series have advanced FREDFET function (fast recovery diode field effect transistor) and integrated non-destructive current detection function.
The combination of its excellent efficiency and the distributed heat dissipation structure of the IHB drive can reduce the weight and cost of the system. The integrated non-destructive current detection system, bus voltage detection circuit and system-wide thermal detection circuit make this series of drivers an ideal choice for BLDC motors for household appliances.
Industrial motors and medium voltage drives must be durable to ensure high reliability and availability under harsh environmental conditions. Power Integrations can also provide gate driver solutions for industrial motors, supporting multi-level topologies and H-bridge series MVD.
Figure 3: Functional block diagram of 2SC0435T
2SC0435T is a compact driver for industrial applications, with a board area of only 57.2 x 51.6 mm and a thickness of only 20 mm. Compared with traditional solutions, the SCALE-2+ chipset can reduce the number of components by 85%, thereby significantly improving equipment reliability and reducing costs. The device provides a complete dual-channel driver core, including all components required to drive, such as isolated DC/DC converters, short-circuit protection circuits, and power supply voltage monitoring. Each of its dual output channels is electrically isolated from the primary and secondary channels.
The working principle of a servo motor is similar to that of a stepper motor, but there are some basic differences. In a traditional servo system, the controller sends signals to the motor drive through pulse/direction or analog position, speed or torque commands. The next-generation controller adopts the Fieldbus structure. The driver transmits the correct amount of current required by each motor phase, and the motor feeds it back to the driver, and then back to the controller if necessary. Based on this information, the drive switches the rotor correctly and sends reliable data about the position of the moving shaft. Therefore, the servo motor is considered “closed loop”, it integrates an encoder (feedback), and the encoder continuously sends the position to the controller.
Power Integrations’ high-reliability gate driver product series, from ICs, driver cores, to plug-and-play drivers, all have high integration, enhanced safety functions and certified isolation functions. Its dual-channel gate driver core 2SC0106T is equipped with the new SCALE-2+ chipset, which is a high-performance dual-channel IGBT/MOSFET gate driver core, suitable for 1200 V IGBTs with a power range of 37 kW to 110 kW. The collector current of 2SC0106T is up to 450A, and it can drive IGBTs from 600V to 1200V, and its switching frequency is up to 50kHz. 2SC0108T is a new SCALE-2 dual-drive core, which has the characteristics of compact design, high reliability and wide applicability.
2SC0108T can drive all conventional IGBT modules, such as 600 A/1200 V or 450 A/1700 V. 2SC0108T combines a complete dual-channel driver core and all drive components, such as isolated DC/DC converters, short-circuit protection, and power supply voltage monitoring.