AC Linear Induction Motor

Product Info | Applications | Operating Info | Ordering Info | Dimensions | Specifications | Custom Application Samples

Featured Product:

AC Linear Induction Motor H2W engineers have developed a new Linear Induction Motor (LIM) that is capable of generating 2900 N at a 3% duty cycle. Operating at 400 VAC, 75 Hz, the synchronous velocity of this LIM is 675 in/sec [17 m/s]. This LIM was designed for high speed operation, however it can also be operated at stall (zero speed) in order to produce static thrust. This motor is encapsulated into a stainless steel enclosure using high temperature (400 F) potting compound which protects the components and seals it from moisture.

Product Info:

 

Travel	Unlimited	Unlimited
Velocity	180 to 1800 inches/sec	[4.5 to 45 m/s]
Acceleration	1 to 10 G's	1 to 10 G's
Peak Force	60 to 900 lbs	[270 to 4000 N]
Continuous Force	4 to 60 lbs	[18 to 267N]

What Is A Linear Induction Motor?

A Linear Induction Motor (LIM) is a non-contacting, high speed, linear motor that operates on the same principal as a rotary, squirrel cage, induction motor. They are capable of speeds up to 1800 in/sec [45 m/s] and are typically used in applications where accurate positioning is not required. LIM’s can also be operated at stall to produce static thrust.

The 3-phase coil assembly can be directly connected to the AC line for single speed applications or to an adjustable frequency drive for precise variable control of the speed of the motor. The motors are reversible and can also be dynamically braked.

The laminated coil assembly (shown above) is used in conjunction with a customer supplied aluminum and steel reaction plate to produce a force. A customer supplied bearing system is required to maintain the .040” - .060” [1 – 1.5 mm] air gap between the coil assembly and the reaction plate. The length of the reaction plate is equal to the coil length plus the stroke.

The amount of thrust produced by the LIM is proportional to the active surface area of the motor.

There is an attractive force between the coil assembly and the steel in the reaction plate only when power is applied to the coil assembly.

Multiple coil assemblies can used together to produce larger forces.

If the reaction plate is a disc, then rotary motion can be produced.

Either the LIM or the reaction plate can move while the other is fixed.

In hostile environments a non-magnetic stainless steel barrier can be used between coil assembly and the reaction plate to provide a seal.

Advantages:

• Only 2 parts
• Wide speed range
• No Maintenance
• Non-contact
• Ease of Control and Installation

Applications:

• Conveying Systems
• Cranes Drives
• Baggage Handling
• Vision Inspection Equipment
• Personal Rapid Transport Systems
• Theme Park Rides

The LIM consists of 2 main components

• 3 Phase Coil Assembly:The coil assembly is comprised of a 3-phase winding that is wound and inserted into a steel lamination stack with thermal protection devices. The entire assembly is then encapsulated with thermally conductive epoxy. Steel Angles with mounting holes are provided for mounting the coil assembly to the customers system. The coil assembly is available in many different widths and lengths, to meet the customers force and packaging requirements. The coil assembly can be used in a single sided or double-sided configuration. The single sided configuration consists of a single coil assembly that is used in conjunction with an aluminum plate backed by a steel reaction plate. The double-sided configuration is where 2 coil assemblies are facing each other, separated by a gap of .25” [6 mm] and only an aluminum reaction plate passes thru the gap. Multiple coil assemblies can be used together to produce larger forces. The standard sizes for the coil assemblies are shown on the following page
• Reaction Plate: The customer supplied reaction plate is required for proper operation of the LIM. The reaction plate is made up of standard, readily available 1018 steel, aluminum, and / or copper. For single sided operation, the required reaction plate consists of a .125” [3 mm] thick aluminum or a .080” [2 mm] thick copper plate that is backed by a .25” [6 mm] thick ferrous steel plate. The steel plate can be omitted but the force will be dramatically reduced. For double-sided operation only a conductive plate of copper or aluminum is required.

Operating Info:

Required Electronics:
A 3-phase AC voltage directly from the line, an adjustable frequency supply, or a vector drive can be used to drive the LIM. The LIMs can be supplied for single phase AC, but the result is a less efficient motor. All standard voltages are available; 220, 380, 400, 415, 460, 600 @ 50 / 60 Hz
The speed of the LIM is proportional to the input frequency (which can be variable) and the pole pitch of the lamination stack (which is fixed). Connecting directly to the AC line at 50 or 60 Hz will produce a constant linear speed. Using an adjustable frequency drive (or inverter) will allow speeds as slow as 6 in/sec [0.15 m/s] and as fast as 1800 in/sec [45 m/s] at 400 Hz.

Mounting:
There are thru holes in the angles of the coil assembly for mounting to the customers system.

Ordering Info:

Individual LIM's can be ordered for any peak force up to 214 lbs [950 N]. Higher forces can be achieved by adding additional coil assemblies in series.

Model # DTS-AAB-CX
where: AA is for the continuous force in lbs (06 is 6 lbs)
B is the number of phases (2 or 4 phase)
C is for the bearing type (A for air bearing) - standard for this model
X is for special options (lead termination and conectors)
(i.e. DST-022-A is a 2.0 lbs continuous force dual axis linear stepper motor, two phase, air bearing and no special options)

Dimensions:

Or click HERE to download a viewer with 3-D CAD drawings of this product.

Specifications:

	Model #	Image	Continuous Force	Peak Force	Continuous Current	Peak Current @ 10% Duty	Length	Width	Weight
1	LMA-03-020		4 lbs 18 N	20 lbs 90 N	0.6 amps	3 amps	6.9 in 175 mm	5.5 in 140 mm	13 lbs 5.9 Kg
2	LMA-05-030		6 lbs 27 N	30 lbs 135 N	0.9 amps	4.5 amps	11 in 280 mm	5.5 in 140 mm	22 lbs 10 Kg
3	LMB-03-026		5 lbs 23 N	26 lbs 115 N	0.7 amps	3.5 amps	6.9 in 175 mm	6.3 in 160 mm	17 lbs 7.5 Kg
4	LMB-05-038		8 lbs 34 N	38 lbs 170 N	1.0 amps	5 amps	11 in 280 mm	6.3 in 160 mm	28 lbs 12.5 Kg
5	LMB-07-051		10 lbs 45 N	551 lbs 225 N	1.4 amps	7 amps	15.4 in 390 mm	6.3 in 160 mm	40 lbs 18 Kg
6	LMC-07-066		13 lbs 59 N	66 lbs 295 N	1.7 amps	8.5 amps	15.4 in 390 mm	7.5 in 190 mm	51 lbs 23 Kg
7	LMC-09-081		16 lbs 72 N	81 lbs 360 N	2.1 amps	10.5 amps	19.7 in 500 mm	7.5 in 190 mm	66 lbs 30 Kg
8	LMD-09-101		20 lbs 90 N	101 lbs 450 N	2.6 amps	13 amps	19.7 in 500 mm	8.7 in 220 mm	82 lbs 37 Kg
9	LMD-11-118		24 lbs 105 N	118 lbs 525 N	3 amps	15 amps	23.8 in 605 mm	8.7 in 220 mm	100 lbs 45 Kg
10	LMD-14-143		29 lbs 127 N	143 lbs 635 N	3.7 amps	18.5 amps	28 in 710 mm	8.7 in 220 mm	117 lbs 53 Kg
11	LME-14-164		39 lbs 39 N	164 lbs 164 N	4.2 amps	21 amps	28.0 in 28.0 mm	9.8 in 9.8 mm	139 lbs 139 Kg
12	LME-16-189		38 lbs 168 N	189 lbs 840 N	4.8 amps	24 amps	32.3 in 820 mm	9.8 in 250 mm	161 lbs 73 Kg
13	LME-18-214		43 lbs 190 N	214 lbs 950 N	5.4 amps	27 amps	36.4 in 925 mm	9.8 in 250 mm	183 lbs 83 Kg
14	LMG-03-325-SSE		lbs N	325 lbs 1444 N	amps	185 amps	18.375 in 467 mm	19.5 in 495 mm	200 lbs 91 Kg
15	LMG-06-650-SSE		lbs N	650 lbs 2900 N	amps	370 amps	32.25 in 819 mm	19.5 in 495 mm	420 lbs 190 Kg

Fc= Continuous Force @ 460V 3 phase @ 100% Duty, Fp = Peak Force @ 460V 3 phase @ 20% Duty
Ic = Continuous Current @ 460V 3 phase @ 100% Duty, Ip = Peak Current @ 460V 3 phase @ 20 % Duty

Model # LMX-AA-BBB
where: X is the width from A to E
AA is the number of poles
BBB is the Peak Force (Fp) in lbs

(i.e. LMC-09-081 is 7.5'' wide Linear Induction Motor with 9 poles and a Peak Force of 81 lbs)