Below information is from our latest Application Note on how to connect and reverse our fixed-speed, 3-wire and 4-wire reversible, AC single-phase gearmotors and motors. We conclude our series of AC application notes with four examples of what types of  reversing switches an engineer or technician can use to reverse our stock gearmotors.

How to Wire an Optional Reversing Switch to a 3- or 4-wire AC (PSC) Motor or Gearmotor (115VAC/60Hz Models)

These connection diagrams show how to wire an optional switch to reverse the direction of a 3- or 4-wire Bodine permanent split capacitor (PSC) motor/gearmotor. All the wiring diagrams use variations of a double throw switch, with a center-off position. The purpose of the center-off position is to bring the gearmotor to a complete stop before reversing its direction of rotation. This is necessary to prevent gearing damage. Table 1 (below) shows examples of switch manufacturers, part numbers and specifications recommended for use with Bodine products.

3- Wire-Reversible Bodine AC Motor or Gearmotor

Examples 1 & 2 show how to connect a single- or double-pole switch to our 3-wire, PSC, fixed-speed AC gearmotors or motors.  

Example 1- How to connect the single pole, double throw switch

Example 1- How to connect a single pole, double throw switch


Example 2- Connect the double pole, double throw switch

Example 2- How to connect a double pole, double throw switch

 4-Wire-Reversible Bodine AC Motor or Gearmotor

Examples 3 & 4 show how to connect a three- or four-pole switch to our 4-wire, PSC, fixed-speed AC gearmotors or motors. 

Example 3- Connect the three pole, double throw switch

Example 3- How to connect a three pole, double throw switch


Step 4- How to connect the four pole, double throw switch

Step 4- How to connect the four pole, double throw switch


Switch specification examples and part numbers

Switch specification examples and part numbers

If you have any questions about how to connect our stock products, please give our support team a call at 773-478-3515 (Chicago area), or e-mail us at: All our stock gearmotor and motor connection diagrams are available from our web site.

Copyright Bodine Electric Company © 06/2014. All rights reserved.

Posted by: Edmund Glueck | May 7, 2014

Bodine 2014 Distributor Training Conference a Great Success!

We would like to thank all attendees for joining us at this year’s Distributor Conference in Northeast Iowa. Attendees came from all regions of the U.S. and from as far away as England. Besides the classroom sessions and the hands-on training, this 2-day event concluded with a number of factory tours at our Peosta, IA plant. Bodine’s commitment to producing the highest quality products is proudly demonstrated at every step of the manufacturing process. Hope to see you at our next event.

Bodine Electric Company: Peosta, Iowa - Manufacturing Plant 04/2014Bodine Distributor Conference: Plant Tour 04/2014Bodine Distributor Conference: Plant Tour, DC Armatures 04/2014Bodine Main Mfg Plant, Peosta, IA - Plant Tour 04/2014 Read More…

Bodine type 34B4-WX Brushless DC (EC) Class I Div 2 Gearmotors

Bodine type 34B4-WX Brushless DC (EC) Class I Div 2 Gearmotors

We now offer versions of our 34B4-WX brushless DC (EC) gearmotors that are ETL listed and comply with National Electrical Code Class I, Division 2 safety standards. Designed to reduce the risk of accidental fires or explosions in hazardous locations, these gearmotors can be used safely in environments such as petroleum refineries, dry cleaning plants and spray finishing areas.

The gearmotors feature low-voltage 12/24V DC brushless motors, eliminating the danger of high-voltage arcing and shorts. They are ideal for solar- or battery-powered applications. Upgraded terminal boxes provide additional insulation for electrical connections, and specially coated commutator assemblies further reduce the risk of accidentally igniting flammable materials.

The new 34B4-WX Class I, Division 2 designs provide all the maintenance-free, long lasting performance of a standard Bodine brushless DC gearmotor. Their high starting torque and linear speed-torque characteristics make them ideal for a wide range of variable speed applications. The WX gearhead features all-steel helical gears and synthetic lubricant for quiet operation and long life. These gearmotors offer continuous duty torque ratings of up to 205 lb-in (23 Nm) and standard gear ratios from 4:1 to 312:1. Minimum order quantities and lead times apply for these products.

More information:

Copyright Bodine Electric Company © 04/2014. All rights reserved.

Posted by: Edmund Glueck | March 26, 2014

Bodine Electric Company Receives Workplace Success Award

Bodine Electric was recently awarded the Workplace Success Award from Iowa’s Department of Education for their efforts in supporting numerous training and workforce preparation programs at Northeast Iowa Community College (NICC).

(L-R) Rick Brindle, Plant Manager (Peosta, Iowa plant; Bodine’s main manufacturing facility) and Jeff Bodine, Executive Vice President of Bodine Electric Company.

(L-R) Rick Brindle, Plant Manager (Peosta, Iowa plant; Bodine’s main manufacturing facility) and Jeff Bodine, Executive Vice President of Bodine Electric Company.

Bodine Electric Company collaborated with NICC to develop training and education programs aimed specifically at technical jobs that require more education than a high-school diploma, but less than full college degree. According to the company’s Executive Vice President, Jeff Bodine, there is a significant gap in the educational makeup of the Iowa workforce. “Middle-skill jobs such as CNC machinist and industrial maintenance technician represent 56 percent of Iowa’s employment needs, yet only 33 percent of Iowa’s workers have the skills to fill these critical occupations,” he said during the award ceremony.

Bodine worked closely with NICC to bring this idea to life. The company donated equipment, developed and reviewed curriculum, and along with other local employers worked with the program advisory board to ensure graduates would be well positioned for success after graduation. Currently, the company is working with NICC to expand the curriculum to include a non-credit mechatronics specialist certificate.

Not only are more positions available to these students, but they have the opportunity to choose where they would like to start. Bodine’s program allowed NICC students to shadow current employees, tour the plant itself, and apply for internships immediately after graduation. Bodine also sponsored recent graduates from the NICC program with a hands-on 2-week training program. According to Dubuque’s Telegraph Herald, ninety-three percent of recent program participants found employment since graduation.

Iowa Department of Education Director Brad Buck stated that this training effort highlights Bodine’s long-term commitment to the Peosta/Dubuque area. Instead of ‘switching gears’ and moving their plant elsewhere, “Bodine tackled its worker shortage by partnering with local educational institutions to elevate the entire community.”

Bodine Electric Receives Workplace Success Award

Bodine Electric Receives Workplace Success Award from IDoE (03/06/2014)

Copyright Bodine Electric Company © 03/2014. All rights reserved.

Posted by: Edmund Glueck | February 21, 2014

New DC Motor Speed Control with Dynamic Braking

Bodine Model 0794 PWM Control with Dynamic Braking

Bodine Model 0794 PWM Control with Dynamic Braking

Our new stock control, model 0794, features a Forward-Brake-Reverse (FBR) switch for dynamic braking. The new control is ideal for use in bi-directional applications such as conveyors, packaging machines, screen-printing equipment, food processing applications, medical devices, lab instrumentation and labeling equipment.

Housed in a NEMA 1/IP-20 enclosure, the new model 0794 provides smooth speed control for PMDC gearmotors and motors. Its pulse width modulated (PWM) design provides higher torque and lower motor operating temperatures than typical SCR controls. Filtered DC output to the motor allows cooler operation, longer brush life, lower audible noise, and wider speed range. The type “WPM” control accepts 115 VAC, 50/60 Hz, 1-phase input. Motor power ratings are 7/16 HP (326 Watts) at 90 VDC, or 5/8 HP (466 Watts) at 130 VDC.

The Forward-Brake-Reverse switch allows dynamic braking in applications where the motor needs to be manually and infrequently reversed, or when required as a setup function in an application. Five trim pot adjustments (TORQ limit, MIN and MAX speed, acceleration/deceleration, and IR compensation) eliminate the computer-like programming required in other drives. DIP switches allow the control to be easily calibrated for different motor sizes. Two Diagnostic LEDs on the PC board indicate when power is on and when current output is at limit set by the TORQ pot.

Bodine Model 0794 PWM Control Connections

Bodine Model 0794 PWM Control Connections

Availability:  Our new model 0794 is available through Bodine’s extensive distributor network, via direct sales to OEMs, or from the Bodine web site. Stock orders typically ship within 2-3 business days. To learn more about our new model 0794, click here.

What is Dynamic Braking?

In basic (non-servo) drive applications, motors and gearmotors are expected to coast only a few shaft rotations after being de-energized. If the application requires precise braking, electromechanical brakes and clutches should be used (see The Bodine Handbook, chapter 10, p.7). In less critical applications, dynamic braking techniques can be employed. Dynamic braking is achieved by altering the connections to the motor with or without the aid of an auxiliary power source, depending on the motor type (DC or AC). In either case, the motor acts like a generator and the kinetic energy of the motor and the driven load is used to exert a retarding force to slow the forward rotation of the motor.

Permanent Magnet DC (PMDC) Motors:  Various techniques are used to accomplish dynamic braking in fractional horsepower PMDC motors and gearmotors. One benefit of the permanent magnet (PMDC) motor over a shunt wound DC motor is that in case of a power failure, the PMDC motor’s braking capability is not affected, because its magnetic field (a permanent magnet rather than a coil) is maintained during a power outage. A normally closed relay or similar device across the armature will automatically function in case of a power failure, shorting the armature’s terminals and initiating the braking action. This inherent characteristic is beneficial, for example, in unwind/rewind applications to prevent unwanted spillage of tape or wire.

The nature of the load is often a vital factor in dynamic braking applications. Caution must be exercised in applying motors which are to be dynamically braked or plugged. In such applications, high currents and dynamic mechanical forces are generated during the braking period. For safety reasons, the thermal and structural capabilities of the drive system should not be exceeded. Dynamic braking of high inertia type loads require additional consideration because of the mechanical and thermal strains which can be induced in both the motor and other associated torque transmitting components. While temperature rise is important in the normal operation of a motor, it is even more important in the dynamic braking of the motor. Since the braking torques generated with some schemes are higher than normal running torque, the energy which the motor must dissipate rises correspondingly. Brush life can be expected to decrease when the frequency or duration of dynamic braking is substantial. Special brushes are usually required.

Model 0794: When the FBR switch on model 0794 is set to “stop” (dynamic braking), the armature leads are disconnected from the control and a braking resistor is connected across the armature terminals causing the motor to decelerate. The response time, or time to dynamically brake, is dependent upon the inertia of the armature, the inertia of the load, brake resistor value, initial speed and a number of other factors. The dynamic braking feature can help to improve cycle times, machine set-up time, and overall process efficiency.

Copyright Bodine Electric Company © 02/2014. All rights reserved.

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