Crouzet’s new gearmotor can be used with peristaltic pumps that have lever mechanisms, making it an ideal solution for applications where sticky or messy fluids are involved, such as milkshake machines.
Designed for motorization
of a wide range of peristaltic positive-displacement pumps, the new
PPGM series of gearmotors from Crouzet North America (Irvine, CA, U.S.;
www.crouzet-usa.com) can be used in applications ranging from
dishwashers and medical appliances to milkshake machines. The pull for
product engineers? The motors’ low noise and life expectancy.
the years, customers have asked for a quieter, longer-life option,” Jim
McNamara, application engineer, tells APPLIANCE. “Reducing noise and
increasing life were design challenges our engineers were up to. The
key to reducing noise and increasing durability is reducing the number
of contact points (i.e., fewer larger gears) and optimizing materials.
The PPGM product line is our answer to these requests.”
create the series, McNamara says the company started with a clean sheet
of paper. “Crouzet’s approach was to combine robust motors with a
robust gearbox using few gears, and a beefy metal back plate with
plastic and metal gears,” he explains.
to withstand the highly cyclical requirements of peristaltic pumps, the
motors are designed to develop significant torque at a relatively low
operating rate to ensure long service life and silent operation.
According to the company, the motors generate about half the noise of
comparative motor models and last twice as long as similar products.
“For medical applications, such as dialysis machines and other
noise-sensitive applications, this gearmotor offers an important
benefit not previously available,” says McNamara. “I would expect a
dishwasher product engineer to find the life expectancy of our PPGM
series to be very useful,” he adds.
pump requirements are translated into torque, speed, and current to
provide the exact motor response needed for the pump while also
supplying the required flow rate and pressure for the application.
“It’s my job to be sure we match the correct motor and gear ratio to
the application,” McNamara says. “Pumps are rated in units of flow and
pressure, which translate into power. Gearmotors are rated in units of
speed and torque, which also translate into power. The key to matching
the gearmotor to the pump is to use the same terms.
many cases, our customers are not able to tell us their requirements in
terms of speeds and torques,” he continues. “Crouzet has conducted
tests with various pumps, tubings, and fluids. In some cases, we can
use the data from this testing to determine which motor and gear ratio
would be best suited for the application.”
can customize their designs to meet specific requirements. Options
include variations on shaft diameter and shape, gear material, ratio
and speed value, connections, mounting options, centering pilot
diameters, and number of encoder pulses. McNamara says a dishwasher
engineer, for example, might even ask for an ac motor to drive the
gearbox. Although he hasn’t had this request yet, he says there is a
range of UL-rated reversible synchronous motors that could be adapted
to drive the PPGM gearbox.
The new series is
available in 16- and 30-W models and features a gearbox torque of 0.5
N•m nominal and an operating voltage of 24 V. The 16-W version is also
available with an operating voltage of 12 V. A wide range of gear
ratios from 12.80 to 104 can create output speeds from 46 to 455 rpm to
provide the versatility necessary to meet a wide range of peristaltic
Encoders are available on
some versions from 1 to 48 pulses for accurate flow pump rate control,
and service life is rated at up to 2000 hours. The gearmotor is said to
mate easily with many types and sizes of peristaltic pumps via a
variety of faceplate configuration options. “We even offer an adapter
plate option, which allows the users to customize their own mounting
hole locations and sizes,” McNamara says. “This provides a
user-friendly mechanical interface.”