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SOLENOID
VALVE
SOLENOID
CONTACTOR
PWM
CONTROL
BOARD
CLUTCH
BRAKE
MODULE
SOLENOID
ACTUATORSRELAYS
Robert M. Haney, BSEE, MSEE, PE
• Former Employers
– Delco Electronics
– IEC, Inc
– Sundstrand
– Barber Colman
– Caterpillar
• Clients– J.I. Case
– Delta Power Company
– MTE Hydraulics
– Dynacorp
– IDI Div Altra Motion
– Hamilton Sundstrand
Solenoid Control, Testing, & Servicing
Solenoid Products – Solenoid Actuators/Valves, Clutches/Brakes,
Contactors/Relays, Electronic Solenoid Controls, Solenoid Transducers
Solenoid Control, Testing, & Servicing
Solenoid Control, Testing, & Servicing
MAGNETIC FLUX
F = Kf (NI)2
(Xg)2Where N = # of turns I = Coil Current
Xg = Gap Width Kf = Constant
FORCE
FERROUS FRAME
Solenoid Control, Testing, & Servicing
Solenoid Control, Testing, & ServicingSummary of Chapter Contents
PART I: Testing of Solenoid Coils, Actuators, Valves,
Clutches/Brakes, Contactors/Relays
1. Testing of Solenoid Coils2. Testing of Solenoid Actuators
3. Testing of Solenoid Valves
4. Proportional Solenoid Actuators and Valves
5. Testing of Clutches and Brakes
6. Testing of Contactors and Relays
PART II: Electrical and Electronic Controls
7. DC/AC Voltage and Current Control
8. Coil Back EMF Suppression and Contact Arc Suppression
9. Peak-and-Hold Control
10. Proportional Control (Linear/PWM/Phase Control)
11. Adding Feedback – Position, Force, Pressure, Flow, etc
Solenoid Control, Testing, & ServicingChapter 1. Testing of Solenoid Coils
Some Electrical Theory Review
Solenoid Control, Testing, & Servicing
Chapter 1. Testing of Solenoid CoilsSome Electrical Theory Review
Solenoid Control, Testing, & Servicing
Resistance vs Temperature
6.0
8.0
10.0
12.0
14.0
-50 -25 0 25 50 75 100 125
Temperature (DegC)
Resistance (Ohms)
Solenoid Control, Testing, & Servicing
Solenoid Control, Testing, & Servicing
Solenoid Control, Testing, & Servicing
Solenoid Control, Testing, & Servicing
Solenoid Control, Testing, & Servicing
DC PUSH SOLENOID AC PULL SOLENOID
Solenoid Control, Testing, & Servicing
Solenoid Actuators
Servicing Tips
PWM CURRENT DITHER
PWM CURRENT DITHER