Yaskawa Electric is a global manufacturer of high-quality parts used in robotics and automation. They specialize in servos, controllers, switches, robots, drives and more. These parts are used for a variety of purposes in industry. In this post, we will be distinguishing the different types of Yaskawa drives.
CIMR Drives E7 Drives– Designed for commercial HVAC applications. Embedded with Modbus, APOGEE FLN and Metasys N2. F7 Drives– Well-rounded drive with a variety of uses. Contains NEMA Type 12 enclosure with space to expand filters, fuses, I/O cards and more. G7 Drives– Low voltage drive that uses 3 level control to combat problems with long motor cables and premature motor bearing failure. Great vector performance and flexibility. Configured options with pre-engineered cabinet options available. P7 Drives– Created for applications with variable torque like centrifugal pumps and fans.
GPD Drives GPD 333– General purpose AC Drive, 1/4 the size of normal PWM drives. GPD 503/505/506– High-performance three phase voltage/frequency output with adjustable speed control. GPD 515- PWM AC drive designed for low motor noise and high starting torque.
Microdrives J1000 Drives– General purpose drives with open loop voltage/frequency control with preferred parameter feature. Simple variable speed of up to 7.5HP. V1000 Drives- Compact current vector drive designed for efficiency and maintainability. Capable of up to 25HP. Economical for basic variable speed applications. V1000-4X Drive- The same as the V1000 but with an enclosure built for dust tight environments.
Other Drives A1000 Drives – High performance general purpose drive capable of up to 1000HP. Used for general purposes. P1000 Drives – Torque performance capable of withstanding 1000HP. Oriented towards variable torque applications including centrifugal pumps and fans. Configured and bypass options available. U1000 Industrial Matrix Drives – Regenerative high performance vector drive capable of up to 800HP. Used for general purposes.
Adjustable speed drives (ASDs), or variable-speed drives (VSDs) is used to describe equipment that assists to control the speed of machinery. Usually, they are using in mechanical equipment powered by motors.
The drives offer truthful electrical motor control enabling motor speeds to be increased, decreased and maintained.
Save On Energy:
Due to energy consumption, centrifugal fan and pump loads operated with versatile speed drives are reduced. The horsepower needed to operate the fan is cut by a much larger factor if the speed of the fan is cut in thirds or in half. As everyone knows, energy savings are what machine automation professionals yearn for.
Controlled torque limit:
By using an adjustable speed drive, machinery can be protected from any damage that may occur. The specific amount of torque applied by the motor to a load is able to be fully controlled.
Controlled Starting Current:
Usually when an ac motor is started “across the line,” it takes about as seven-to-eight times to start the motor and load.
By utilizing an adjustable speed drive, the considerably reduced starting current expands the life of an ac motor. The benefits are less wear & tear on the motor which translates to extend motor life and less motor rewinds.
Governed stopping backs up diminish product loss because of machine-driven wear and tear attributed to shocks to the process.
The requirement for a reversing started is mitigated in regards to utilizing an adjustable speed drive. The reason being is the output phases to the motor can be morphed electronically. Removing the reversing starter terminates its upkeep expense while also minimizing panel space.
Decreased Power Demand on Start:
To begin an AC motor across the line, one is going to need much more power compared to beginning an adjustable speed drive. This is only the case at the start because the power to run the motor at load would be the same regardless of its variable speed.
Adjustable Operating Speed:
Process automation and implementing changes in a process is allowed due to deploying an adjustable speed drive. This also enables beginning at a shortened speed and allows remote acclimation of speed by process controllers.
Removal of mechanical drive components:
By using an adjustable speed drive, the likelihood of needing costly mechanical drive components like gearboxes can be mitigated. The AC drive is able to transport the high and/or low speed required by the load with a consistent speed between the motor and load because it’s able to function with an infinite variable speed.
AC or DC Drives Comparison: Which is best for you?
An AC drive stands for Alternating Current, but could also be referred to as an adjustable speed drive, adjustable frequency drive, variable frequency drive, variable speed drive, frequency converter, inverters and a power converter. Typically, they are used to control the speed of an electric motor in order to enhance the operation of numerous applications relying on electric motors, minimize mechanical stress on motor control applications, generate energy as efficiently as possible, cut down on energy usage and, lastly, optimize process control.
Also known as adjustable speed drives, inverters and power converters, adjustable frequency drives, and variable speed drives, AC drives are similar to DC drives because an AC input is regulated to DC by simple bridge rectifiers, commonly referred to as SCRs. Because AC drives use a capacitor bank to stabilize and smooth this DC voltage, the DC output would be half cycle according to AC input phase frequency. Then, power is supplied to the motor in the output section of the drive by means of 6 output transistor or IGBT modules. Essentially, the AC input current is converted by the drive to DC and, again, converted back to AC in order to supply the motor. The current is converted twice by the drive because the AC input is either 50 or 60-hertz cycles. When the DC voltage is converted to AC again by the drive, it uses a carrier frequency of at least 2 KHZ to 100 KHZ in more complex drives. Therefore, the output current is able to be raised tens or hundreds of times without burning up the motor coil.
The AC motor is also able to rapidly switch speeds with zero problems because of this function. AC drives typically have numerous types of feedbacks from simple, 2-line incremental encoders, to resolvers or absolute encoders with a significant resolution that facilitates the drive to calculate motor shaft speed and angle as spot-on as possible. There is a third circuit called regeneration on a handful of larger, more powerful drives. This circuit converts the inertia of the load and motor to AC power and transfers it back to the input lines when the motor transitions from a significantly high speed to a low one, which, in the long run, would conserve on power and increase energy efficiency.
AC drives serve many different industrial and commercial applications.
Essentially, a DC drive converts an AC drive into direct current, otherwise known as DC to operate a DC motor. The majority of DC drives use a handful of thyristors (also known as SCR’s) to craft a half cycle of DC output from a single phase AC input, also known as the half-bridge method. The more complex ones use up to 6 SCR’s to power a DC output from a 3 phase AC input, which is known as the full-bridge. Therefore, in the full-bridge method, we have 2 SCR’s for every input phase. The aspects of a DC drive are as follows: compact in size, outstanding speed regulation, broad speed range, cost-effective for medium and high HP applications, and speed changes that are derived from by increasing or decreasing the amount of DC voltage the drive feeds the motor.
Controlled by the gate input, an SCR switch is similar to a one direction switch and turns on by applying a low voltage to the gates. The drive can control the motor speed by applying the voltage to the gate at a contrasting angle of the input phase. To authenticate the motor speed and compensate if necessary, the majority of DC drives require the motor to have a tachometer as means of feedback. A tachometer is essentially a mini permanent magnet DC motor accompanied by the main motor’s shaft.
Because higher motor speed generates more voltage in the tachometer, the drive references this voltage to ensure the motor is operating at a correct speed per-user settings. More compact DC motors have a permanent magnet field while larger DC motors have a separate coil inside the motor, also known as a field, which eliminates the need for a permanent magnet in the motor. DC drives with field output typically have a more compact circuit to supply the field coil. DC drives are best used in when a DC motor exists in a safe and dry atmosphere and the use of DPG, DPG-FV, TENV, or TEFC motor enclosures is required, motor speeds are able to reach 2500 RPM, application requirements are medium or large, and starting torque is either unpredictable or greater than 150%.
DC drives are commonly considered problematic, despite their prestige for having simple circuits, providing high start-up torque, and being ideal for applications with constant speed due to the requirement of commutators and brush assemblies in their motors. These motors can become worn over time, have operational issues, and will likely require labor to preserve.
On the opposite side of the spectrum, AC drives are considered more energy-friendly and are able to endure rapid speed changes more efficiently due to their running induction motors. Often times, they have hundreds of numerous programmable parameters for secure protection. Although, because of these factors, the AC drive is more complex, modernized software is simplifying their overall use.
In previous years, DC drives were regularly utilized due to their simplicity, the majority of machine manufacturers prefer to use AC drives as of late. The complexity of an AC drive has been repeatedly simplified and fine-tuned, resulting in a plethora of advantages.
Though in the past DC drives were often utilized due to their simplicity, most machine manufacturers now prefer to use AC drives (especially for servo applications). The intricacy of an AC drive has been simplified over time and has many upper hands.