The application of the motor is very wide, covering all areas of work and life, such as printers, copiers, fax machines, projectors, refrigerators, washing machines, air conditioners, gas stoves, cameras, ATM machines, electric sewing machines, security cameras, vending machines. , hot water supply system, garden irrigation system and industrial automation.
In today's energy-saving and increasingly valued, energy-efficient drive motors are particularly important. In terms of type, the motor includes an AC motor, a DC brush motor, a DC brushless motor, a permanent magnet synchronous motor, a servo motor, and a stepping motor. Among them, the stepper motor uses pulse operation, also called digital motor or pulse motor. The rotation angle of the stepper motor is proportional to the number of pulses, and the speed is proportional to the pulse frequency. The rotation of the stepper motor can be precisely controlled by controlling the number of pulses, making it very suitable for positioning applications. This article explores the common challenges of stepper motor drives and highlights ON Semiconductor's energy-efficient stepper motor driver solutions for office automation equipment applications.
Common challenges for stepper motor drive applications
Motor drives can be used in many different applications. Design engineers face some common challenges when using motor drives in their designs. First, most of today's designs require motor drive applications and associated motor drive ICs and components to provide low power and energy efficiency. For example, if the fan driver board is inside the sealed housing, heat is generated, requiring additional energy to cool it. Therefore, it is necessary to use a built-in fan to circulate cold air inside to reduce heat and manage heat dissipation. Engineers may require low power losses and also require powerful motors with energy efficient cooling.
Figure 1. Example of a motor driver application and its common challenges.
Secondly, from the perspective of the end user, it is extremely necessary to reduce the noise generated by the motor to avoid feeling uncomfortable. The designer must also be able to compensate for any external noise or vibration in the system. Again, whether due to limited living space or user preferences, high consumer demand for compact solutions is a common consumer trend. This trend has led to a preference for smaller size and lower noise motors, but this is not always possible when trying to compensate for other design requirements.
It is worth noting that the durability and safety of motors and motor drives are critical because high voltage power supplies are required to drive applications such as white goods and industrial applications. Not to mention engineers need to choose reliable motors that can precisely control speed.
Working principle of permanent magnet and hybrid stepping motors
Stepper motors are often used in precision control applications and use techniques like microstepping to reduce motor vibration. Figure 2 shows the working principle of the permanent magnet type stepping motor and the hybrid stepping motor. Stepper motors operate as digital pulses, often referred to as synchronous or pulsed motors. The stepper motor controls the rotation by turning the MOSFET on and off.
Figure 2. Working principle of permanent magnet and hybrid stepper motors.
Taking the left side of Figure 2 as an example, when current flows through MOSFET switches OUT1 and OUT2, the position of the permanent magnet rotor is as shown on the left. By controlling the currents of OUT1, 2, 3, and 4, the rotor position can be controlled. The rotation angle is proportional to the number of pulses, which is proportional to the frequency of the pulse. You can control the rotor position precisely by controlling the number of pulses to make it suitable for positioning.
Stepper motor and driver products for office automation equipment applications
As mentioned earlier, stepper motors are used in a wide range of applications, such as in ATM ATMs for billing control and passbook entry, as well as for merchandising in vending machines and for wheeling in slot machines. Disk rotation, etc. The focus of this article is on stepper motors and actuators for office automation applications, such as printers and scanners. In general, stepper motors may be used for position control in functions such as paper feed, paper tray, and scanning.
Figure 3: Example application of stepper motor and driver in common office automation equipment.
As shown in Figure 3, the stepper motor accurately moves the paper from point A to point B. If the primary requirement of the end user is a silent drive, then a low-vibration microstepping stepper motor is suitable. In this type of application, stepper motors and brushless DC motors are used to press the ribbon onto the paper. A stepper motor is required to adjust the pressure of the ink ribbon to the paper where it needs to be positioned. In equipment such as desktop scanners, designers choose motors with positioning, low vibration, and motor rotation control.
Anderson Semiconductor, which drives energy-efficient innovation, offers a broad lineup of motor driver products for a variety of typical motor applications. Table 1 lists only the motor driver products used by ON Semiconductor for applications such as printers (in addition to stepper motors, including brushless DC motors and DC brush motors) for designers' reference.
Table 1: An overview of the motor driver products used by ON Semiconductor for common office automation equipment such as printers.
Features, Benefits and Application Examples of the LV8702 Energy-Efficient Stepper Motor Driver
At present, the stepper motor used in various electronic products has low energy efficiency, which has become a focus of attention in the industry and also poses a challenge for power system design engineers. The LV8702 high-efficiency stepper motor driver IC from ON Semiconductor overcomes these challenges by providing a unique drive system that helps save motor no-load energy consumption and offers multiple application advantages.
The LV8702's supply voltage VM ranges from 9 to 32 V and supports up to 36 V; the output current is 2.5 A and supports a peak current of 3 A. The device's output on-resistance is only 0.55 Ω, helping to drive stepper motors with energy efficiency. The LV8702's built-in energy-efficient mode, out-of-synchronization detection and output short-circuit protection help reduce motor drive energy consumption, reduce heat generation, reduce vibration and noise, and provide high reliability. Typical applications for the LV8702 include office automation equipment such as copiers, document scanners, and multifunction printers, as well as sewing machines and other entertainment equipment such as equipment and slot machines.
Figure 4. The ON Semiconductor LV8702 high-efficiency stepper motor driver IC application demonstration device.
To demonstrate the application advantages of the LV8702 stepper motor driver, ON Semiconductor has built a demonstration device as shown in Figure 4. We first turn on the motor switch. This switch enables the LV8702 motor driver IC to show its usefulness. As the motor starts running, let's measure the motor current waveform. Then, while keeping the motor driven, we turn on the energy-efficient switch. The current waveform test results are shown in Figure 5. The left side shows the motor driver drive current when the energy-efficient switch is not enabled, and the right side shows the situation after the high-energy switch is turned on. It can be seen that the drive current is significantly reduced, indicating lower energy consumption.
Figure 5. The LV8702 provides an energy-efficient drive mode through the GAD pin design to help reduce average current and reduce power consumption.
The LV8702 energy-efficient mode reduces the average current and thus the heat generated. The IC surface temperature test showed that the driver IC and motor surface temperatures were reduced by 46 ° C and 28 ° C, respectively, with the energy-efficient switch enabled. This feature has the potential to eliminate cooling fans in some applications, saving space and cost, and enhancing system reliability. In addition, by comparing the motor VM current, it was found that the LV8702 can save up to 80% energy (see Figure 6). Designers can use the LV8702 to develop energy-efficient office automation equipment that meets the needs of energy efficiency around the world.
Figure 6. By comparing the motor VM current, it can be seen that the LV8702 can significantly reduce the energy consumption of the motor.
The LV8702 has a built-in charge pump circuit for driving high-side N-channel MOSFETs. The LV8702 supports four microstep modes, including full step, half step (full torque), half step and 1/4 step, which can help reduce motor vibration and reduce noise. This device has an output short-circuit protection function that protects the output against short-circuits, short-to-ground shorts, and short-circuit loads.
to sum up:
For today's power system designers, to meet the world's energy efficiency regulations and end users' higher energy requirements, not only to improve the energy efficiency of the power supply, improve the power factor and reduce light load and standby energy consumption, but also to enhance today's The energy efficiency of motors that are widely used in electronic products reduces their energy consumption and provides reliability. In response to these demands, ON Semiconductor offers a broad lineup of energy efficient motor driver products. This paper focuses on the common challenges of stepper motor drive and its working principle. It provides an overview of ON Semiconductor's product line for stepper motor drives, focusing on the features of ON Semiconductor's LV8702 high-efficiency stepper motor driver, combined with the demonstration device. The test results, introduced its application advantages, are designed to help designers use this series of ICs to develop energy-efficient office automation equipment motor drive applications, occupying a favorable position in the market competition.
About Silicone Basket
Are you still using plastic basket?Why not to use Silicone Basket to instead of plastic basket?It's cheaper and more durable than plastic basket.It won't broken easily.And here are some details about it:
FDA approved, food quality material!
Use these wonderful sieves for all your kitchen needs needs. Work for noodles, potatoes, broccoli, and all kinds of vegetables, including leafy vegetables.
Collapse for easy, space-saving storage! The screen collapses up to about 2-3 inches high.
It takes up little space and runs very quickly! All holes are where you need it - at the bottom of the screen!
The Love Chef screen set is ideal for emptying a variety of hot and cold products while cooking! Dishwasher safe!
Other Silicone Basket you can visit on Silicone Basket, Silicone Drain Basket ,Silicone Foldable Basket,Silicone Basket Strainer,Silicone Folding Basket,Silicone Cooking Basket.
Product introduction:
1.Product name:Silicone Basket,Silicone Drain Basket,Silicone Foldable Basket,Silicone Basket Strainer,Silicone Folding Basket,Silicone Cooking Basket
2.Place of origin:Guangdong China
3.Color:any pantone color
4.Effect:Any effect according to customer's requirement
5.MOQ:500pcs.
6.Package:1 pcs/opp,customized design is available.
7.Design:Customized/stock
8.Certification:FDA,LFGB,SGS,ROHS,etc.
9.Usage:Use for wash and load vegetables and fruits
10.Silicone Basket photos for reference.
Silicone Basket
Silicone Basket,Silicone Drain Basket,Silicone Foldable Basket,Silicone Basket Strainer,Silicone Folding Basket,Silicone Cooking Basket
OK Silicone Gift Co., Ltd. , https://www.oemsiliconegift.com