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Motor control in industrial applications
Industrial drive applications need to take into account the load on the motor, speed, acceleration, deceleration and duty cycle of the motor. These criteria are used to determine the horsepower and torque requirements. The control of the motor speed and position of the rotor also need to be considered when deciding whether to use constant or variable horsepower.
Variable horsepower / Constant torque
For example, variable horsepower applications with constant torque include gear pumps, cranes and drives for conveyor belts. These often use a constant-speed AC or DC electric motor as the load is constant.
Constant horsepower / Variable torque
A constant horsepower drive with variable torque often uses a DC or servo motor, or an AC motor with a closed-loop control. These can be used for applications such as unwinding and rewinding in roll-to-roll machines.
Variable horsepower / Variable torque
The third approach of variable horsepower and variable torque is often used in centrifugal pumps, fans, mixers and agitators. This is because in these industrial applications the load increases as the speed increases. Naturally a variable frequency drive (VFD) is a suitable solution for such a design. Linear motion drives and actuators often need accurate control of the position of the rotor and stator, while presses and tension control systems can need accurate torque control. These often use an industrial servo drive or stepper motor with a feedback control system to provide high performance.
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ST offers an extensive range of 8-bit STM8 and 32-bit STM32 microcontrollers, a wide range of power discrete including IGBTs and power MOSFETs, as well as integrated power modules (IPM) to help build scalable, high-efficiency power stages with power ranging from a few watts up to tens of kilowatts.
Additionally, ST provides an extensive portfolio of high-performance operational amplifiers and comparators, switching and linear regulators and MEMS inertial and environmental sensors – to enable predictive maintenance – and a comprehensive range of software and hardware evaluation tools to help reduce time and cost of development and design.
