I have a number of identical Three Phase BLDC Motors that I want to be able to run at various rpm in my test fixture. The design specs for the BLDC motor that I am referring to is; Motor Type - Synchronous motor having 8 poles in a permanent magnet field and three phases in the wound stator connected in a Wye with Three (3) Leads for operating as a BLDC Motor with Resolver Commutation. Motor WindingConstants are; Design Voltage (Rated) - 233 VDC, Stall Current @ Design Voltage (Ip) - 685 Amps, Stall Power @ Design Voltage (Pp) - 159.2 K Watts; Peak Torque (25 Degrees C) (Tp) - 3440 Lb-In, Resistance Line-To-Line 9Rm) - 0.395 Ohms, Torque per unit Line Current (Kt) —- 5.02 Lb.- In /A, Voltage Constant - 67.6 V/KRPM, Inductance (Lm) - 2.25 mH. Rotation - CW as viewed from the shaft end with the following stepped excitation sequence- Step 1, Phase A + Phase B -, Step 2, Phase A + Phase C -, Step 3, Phase B + Phase C -, Step 4, Phase B + Phase A -, Step 5, Phase C + Phase A -, Step 6, Phase C + Phase B -. For CCW Rotation reverse polarities.
This motor has an Amphenol circular connector with only four (4) pin connections and they are; Pins A, B & C correspond with Phases A, B & C which are DC power inputs from the Driver and Pin D is Case Ground.
IMPORTANT NOTE: I AM ONLY INTENDING TO RUN THIS MOTOR ON MY TEST FIXTURE AT “NO LOAD”, WHICH ONLY REQUIRES A MAXIMUM OF APPROXIMATELY 5 AMPS. IT WOULD BE NICE TO HAVE A DRIVE CAPABLE OF A MAXIMUM OUTPUT OF 10 AMPS. I DO WANT TO BE ABLE TO OPERATE THE MOTOR WITH INPUT VOLTAGE OF 233 VDC IN ORDER TO OBTAIN THE RATED RPM.
I would very much appreciate input on how to best build/have built/purchase a motor driver that would meet the No Load requirements I described in the "Important Note" above. I ran across the motor driver designated as; TMDSHVMTRINSPIN. In addition, a co-worker of TI's James Lockridge - Analog Motor Drives pointed out another Motor Driver Model, TMDSHVMTRPFCKIT. The description pages for both products indicates they are "High Voltage and Currents" type of drive, which I assume is referring to the input and output power? If it is powered with an input of Single Phase 240V, is the three phase DC output voltage value directly correlate to the input voltage? I have looked for the Output Voltage & Amperage but I've either overlooked it or didn't look at the right document. Could you please answer a few questions on this motor drive? 1. Is the output voltage Three Phase DC? 2. What is the Output Voltage and amperage range? 3. Based upon my three phase BLDC motor specs set forth in the first paragraph of this Post; would this TI Motor Driver have any problems running it under a NO LOAD, 5 amp maximum current draw within the TI Driver Design Output Voltage? 4. Can the Output Voltage be easily increased and decreased (such as a integral Pot or a TI motor driver software application) to change my motor's rpm? 5. If I purchased the TMDSHVMTRINSPIN or the TMDSHVMTRPFCKIT at $699 from TI, would I need to purchase additional components from TI in order to be able to run my motor at No Load in my test fixture; of course, within the design voltage output range of the either driver model?
I have a limited window to get a motor driver into operation to test these motors, so, anything anyone can do to help me through the process will be greatly appreciated!
Ron Stewart
